diff --git a/backend/src/main/java/codezap/category/repository/CategoryRepository.java b/backend/src/main/java/codezap/category/repository/CategoryRepository.java
index 85b4178d2..690bf68d8 100644
--- a/backend/src/main/java/codezap/category/repository/CategoryRepository.java
+++ b/backend/src/main/java/codezap/category/repository/CategoryRepository.java
@@ -29,10 +29,6 @@ public List<Category> findAllByMemberIdOrderById(Long memberId) {
         return categoryJpaRepository.findAllByMemberIdOrderById(memberId);
     }
 
-    public List<Category> findAll() {
-        return categoryJpaRepository.findAll();
-    }
-
     public boolean existsByNameAndMember(String categoryName, Member member) {
         return categoryJpaRepository.existsByNameAndMember(categoryName, member);
     }
diff --git a/backend/src/main/java/codezap/category/service/CategoryService.java b/backend/src/main/java/codezap/category/service/CategoryService.java
index 9300ac5d1..783558123 100644
--- a/backend/src/main/java/codezap/category/service/CategoryService.java
+++ b/backend/src/main/java/codezap/category/service/CategoryService.java
@@ -35,10 +35,6 @@ public FindAllCategoriesResponse findAllByMemberId(Long memberId) {
         return FindAllCategoriesResponse.from(categoryRepository.findAllByMemberIdOrderById(memberId));
     }
 
-    public FindAllCategoriesResponse findAll() {
-        return FindAllCategoriesResponse.from(categoryRepository.findAll());
-    }
-
     public Category fetchById(Long id) {
         return categoryRepository.fetchById(id);
     }
diff --git a/backend/src/main/java/codezap/tag/service/TagService.java b/backend/src/main/java/codezap/tag/service/TagService.java
index 0222be680..eec3c35b4 100644
--- a/backend/src/main/java/codezap/tag/service/TagService.java
+++ b/backend/src/main/java/codezap/tag/service/TagService.java
@@ -58,12 +58,6 @@ public List<Tag> findAllByTemplate(Template template) {
         return templateTagRepository.findAllTagsByTemplate(template);
     }
 
-    public List<Tag> findAllByTemplateId(Long templateId) {
-        return templateTagRepository.findAllByTemplateId(templateId).stream()
-                .map(TemplateTag::getTag)
-                .toList();
-    }
-
     public List<TemplateTag> getAllTemplateTagsByTemplates(List<Template> templates) {
         List<Long> templateIds = templates.stream().map(Template::getId).toList();
         return templateTagRepository.findAllByTemplateIdsIn(templateIds);
diff --git a/backend/src/main/java/codezap/template/dto/request/CreateTemplateRequest.java b/backend/src/main/java/codezap/template/dto/request/CreateTemplateRequest.java
index 0319da47b..d99f71cd8 100644
--- a/backend/src/main/java/codezap/template/dto/request/CreateTemplateRequest.java
+++ b/backend/src/main/java/codezap/template/dto/request/CreateTemplateRequest.java
@@ -11,6 +11,7 @@
 import codezap.global.validation.ValidationGroups.NotNullGroup;
 import codezap.global.validation.ValidationGroups.SizeCheckGroup;
 import codezap.template.domain.Visibility;
+import codezap.template.dto.request.validation.ValidatedSourceCodesCountRequest;
 import codezap.template.dto.request.validation.ValidatedSourceCodesOrdinalRequest;
 import io.swagger.v3.oas.annotations.media.Schema;
 
@@ -47,12 +48,18 @@ public record CreateTemplateRequest(
         @Schema(description = "템플릿 공개 여부", example = "PUBLIC")
         @NotNull(message = "템플릿 공개 여부가 null 입니다.", groups = NotNullGroup.class)
         Visibility visibility
-) implements ValidatedSourceCodesOrdinalRequest {
+) implements ValidatedSourceCodesOrdinalRequest, ValidatedSourceCodesCountRequest {
 
     @Override
     public List<Integer> extractSourceCodesOrdinal() {
         return sourceCodes.stream()
                 .map(CreateSourceCodeRequest::ordinal)
+                .sorted()
                 .toList();
     }
+
+    @Override
+    public Integer countSourceCodes() {
+        return sourceCodes.size();
+    }
 }
diff --git a/backend/src/main/java/codezap/template/dto/request/UpdateTemplateRequest.java b/backend/src/main/java/codezap/template/dto/request/UpdateTemplateRequest.java
index 8daced790..45da69163 100644
--- a/backend/src/main/java/codezap/template/dto/request/UpdateTemplateRequest.java
+++ b/backend/src/main/java/codezap/template/dto/request/UpdateTemplateRequest.java
@@ -53,12 +53,14 @@ public record UpdateTemplateRequest(
         @NotNull(message = "템플릿 공개 여부가 null 입니다.", groups = NotNullGroup.class)
         Visibility visibility
 ) implements ValidatedSourceCodesOrdinalRequest, ValidatedSourceCodesCountRequest {
+
     @Override
     public List<Integer> extractSourceCodesOrdinal() {
         return Stream.concat(
-                updateSourceCodes.stream().map(UpdateSourceCodeRequest::ordinal),
-                createSourceCodes.stream().map(CreateSourceCodeRequest::ordinal)
-        ).toList();
+                        updateSourceCodes.stream().map(UpdateSourceCodeRequest::ordinal),
+                        createSourceCodes.stream().map(CreateSourceCodeRequest::ordinal)
+                ).sorted()
+                .toList();
     }
 
     @Override
diff --git a/backend/src/main/java/codezap/template/repository/TemplateRepository.java b/backend/src/main/java/codezap/template/repository/TemplateRepository.java
index fc7da4626..52981cf10 100644
--- a/backend/src/main/java/codezap/template/repository/TemplateRepository.java
+++ b/backend/src/main/java/codezap/template/repository/TemplateRepository.java
@@ -24,10 +24,6 @@ public Template fetchById(Long id) {
                 () -> new CodeZapException(ErrorCode.RESOURCE_NOT_FOUND, "식별자 " + id + "에 해당하는 템플릿이 존재하지 않습니다."));
     }
 
-    public List<Template> findByMemberId(Long id) {
-        return templateJpaRepository.findByMemberId(id);
-    }
-
     public FixedPage<Template> findAll(
             Long memberId, String keyword, Long categoryId, List<Long> tagIds, Visibility visibility, Pageable pageable
     ) {
diff --git a/backend/src/main/java/codezap/template/service/SourceCodeService.java b/backend/src/main/java/codezap/template/service/SourceCodeService.java
index 8b89fd25b..70ade795e 100644
--- a/backend/src/main/java/codezap/template/service/SourceCodeService.java
+++ b/backend/src/main/java/codezap/template/service/SourceCodeService.java
@@ -2,6 +2,7 @@
 
 import java.util.List;
 import java.util.Objects;
+import java.util.stream.IntStream;
 
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
@@ -12,8 +13,11 @@
 import codezap.template.domain.Template;
 import codezap.template.domain.Thumbnail;
 import codezap.template.dto.request.CreateSourceCodeRequest;
+import codezap.template.dto.request.CreateTemplateRequest;
 import codezap.template.dto.request.UpdateSourceCodeRequest;
 import codezap.template.dto.request.UpdateTemplateRequest;
+import codezap.template.dto.request.validation.ValidatedSourceCodesCountRequest;
+import codezap.template.dto.request.validation.ValidatedSourceCodesOrdinalRequest;
 import codezap.template.repository.SourceCodeRepository;
 import lombok.RequiredArgsConstructor;
 
@@ -22,12 +26,17 @@
 @Transactional(readOnly = true)
 public class SourceCodeService {
 
+    private static final int MINIMUM_SOURCE_CODE_COUNT = 1;
+    
     private final SourceCodeRepository sourceCodeRepository;
 
     @Transactional
-    public void createSourceCodes(Template template, List<CreateSourceCodeRequest> sourceCodes) {
+    public void createSourceCodes(Template template, CreateTemplateRequest request) {
+        validateSourceCodeCount(request);
+        validateSourceCodesOrdinal(request);
+
         sourceCodeRepository.saveAll(
-                sourceCodes.stream()
+                request.sourceCodes().stream()
                         .map(createSourceCodeRequest -> createSourceCode(template, createSourceCodeRequest))
                         .toList()
         );
@@ -43,6 +52,9 @@ public List<SourceCode> findAllByTemplate(Template template) {
 
     @Transactional
     public void updateSourceCodes(UpdateTemplateRequest updateTemplateRequest, Template template, Thumbnail thumbnail) {
+        validateSourceCodeCount(updateTemplateRequest);
+        validateSourceCodesOrdinal(updateTemplateRequest);
+
         updateTemplateRequest.updateSourceCodes().forEach(this::updateSourceCode);
         sourceCodeRepository.saveAll(
                 updateTemplateRequest.createSourceCodes().stream()
@@ -52,7 +64,23 @@ public void updateSourceCodes(UpdateTemplateRequest updateTemplateRequest, Templ
 
         updateThumbnail(updateTemplateRequest, template, thumbnail);
         updateTemplateRequest.deleteSourceCodeIds().forEach(sourceCodeRepository::deleteById);
-        validateSourceCodesCount(template, updateTemplateRequest);
+
+        validateSourceCodeCountMatch(template, updateTemplateRequest);
+    }
+
+    private void validateSourceCodeCount(ValidatedSourceCodesCountRequest request) {
+        if(request.countSourceCodes() < MINIMUM_SOURCE_CODE_COUNT) {
+            throw new CodeZapException(ErrorCode.INVALID_REQUEST, "소스 코드는 최소 1개 입력해야 합니다.");
+        }
+    }
+
+    private void validateSourceCodesOrdinal(ValidatedSourceCodesOrdinalRequest request) {
+        List<Integer> indexes = request.extractSourceCodesOrdinal();
+        boolean isOrderValid = IntStream.range(0, indexes.size())
+                .allMatch(index -> indexes.get(index) == index + 1);
+        if(!isOrderValid) {
+            throw new CodeZapException(ErrorCode.INVALID_REQUEST, "소스 코드 순서가 잘못되었습니다.");
+        }
     }
 
     private void updateSourceCode(UpdateSourceCodeRequest updateSourceCodeRequest) {
@@ -92,9 +120,8 @@ private void refreshThumbnail(Template template, Thumbnail thumbnail) {
                 .ifPresent(thumbnail::updateThumbnail);
     }
 
-    private void validateSourceCodesCount(Template template, UpdateTemplateRequest updateTemplateRequest) {
-        if (updateTemplateRequest.updateSourceCodes().size() + updateTemplateRequest.createSourceCodes().size()
-                != sourceCodeRepository.countByTemplate(template)) {
+    private void validateSourceCodeCountMatch(Template template, UpdateTemplateRequest updateTemplateRequest) {
+        if (updateTemplateRequest.countSourceCodes() != sourceCodeRepository.countByTemplate(template)) {
             throw new CodeZapException(ErrorCode.INVALID_REQUEST, "소스 코드의 정보가 정확하지 않습니다.");
         }
     }
diff --git a/backend/src/main/java/codezap/template/service/TemplateService.java b/backend/src/main/java/codezap/template/service/TemplateService.java
index d13a6db45..4bd807789 100644
--- a/backend/src/main/java/codezap/template/service/TemplateService.java
+++ b/backend/src/main/java/codezap/template/service/TemplateService.java
@@ -41,10 +41,6 @@ public Template getById(Long id) {
         return templateRepository.fetchById(id);
     }
 
-    public List<Template> getByMemberId(Long memberId) {
-        return templateRepository.findByMemberId(memberId);
-    }
-
     public FixedPage<Template> findAllBy(
             Long memberId,
             String keyword,
diff --git a/backend/src/main/java/codezap/template/service/ThumbnailService.java b/backend/src/main/java/codezap/template/service/ThumbnailService.java
index 087e2e249..e54df4fd4 100644
--- a/backend/src/main/java/codezap/template/service/ThumbnailService.java
+++ b/backend/src/main/java/codezap/template/service/ThumbnailService.java
@@ -36,10 +36,6 @@ public List<Thumbnail> getAllByTemplates(List<Template> templates) {
         return thumbnailRepository.findAllByTemplateIn(templateIds);
     }
 
-    public ExploreTemplatesResponse findAll() {
-        return ExploreTemplatesResponse.from(thumbnailRepository.findAll());
-    }
-
     @Transactional
     public void deleteAllByTemplateIds(List<Long> templateIds) {
         thumbnailRepository.deleteAllByTemplateIds(templateIds);
diff --git a/backend/src/main/java/codezap/template/service/facade/TemplateApplicationService.java b/backend/src/main/java/codezap/template/service/facade/TemplateApplicationService.java
index fdb50368f..d539898a0 100644
--- a/backend/src/main/java/codezap/template/service/facade/TemplateApplicationService.java
+++ b/backend/src/main/java/codezap/template/service/facade/TemplateApplicationService.java
@@ -54,7 +54,7 @@ public Long create(Member member, CreateTemplateRequest createTemplateRequest) {
         category.validateAuthorization(member);
         Template template = templateService.create(member, createTemplateRequest, category);
         tagService.createTags(template, createTemplateRequest.tags());
-        sourceCodeService.createSourceCodes(template, createTemplateRequest.sourceCodes());
+        sourceCodeService.createSourceCodes(template, createTemplateRequest);
         SourceCode thumbnail = sourceCodeService.getByTemplateAndOrdinal(
                 template,
                 createTemplateRequest.thumbnailOrdinal());
diff --git a/backend/src/test/java/codezap/category/service/CategoryServiceTest.java b/backend/src/test/java/codezap/category/service/CategoryServiceTest.java
index d58d7d423..aca580436 100644
--- a/backend/src/test/java/codezap/category/service/CategoryServiceTest.java
+++ b/backend/src/test/java/codezap/category/service/CategoryServiceTest.java
@@ -5,7 +5,6 @@
 import static org.assertj.core.api.Assertions.assertThatThrownBy;
 import static org.junit.jupiter.api.Assertions.assertAll;
 
-import org.junit.jupiter.api.Disabled;
 import org.junit.jupiter.api.DisplayName;
 import org.junit.jupiter.api.Nested;
 import org.junit.jupiter.api.Test;
@@ -114,32 +113,6 @@ void failWithNotExistMember() {
         }
     }
 
-    @Nested
-    @DisplayName("카테고리 전체 조회 테스트")
-    class FindAllCategoryTest {
-
-        @Test
-        @DisplayName("성공")
-        void findAllCategoriesSuccess() {
-            Member member = memberRepository.save(MemberFixture.memberFixture());
-
-            categoryRepository.save(new Category("category1", member));
-            categoryRepository.save(new Category("category2", member));
-
-            FindAllCategoriesResponse findAllCategoriesResponse = sut.findAll();
-
-            assertThat(findAllCategoriesResponse.categories()).hasSize(2);
-        }
-
-        @Test
-        @DisplayName("성공 : 카테고리가 존재하지 않으면 빈 리스트를 반환한다.")
-        void findAllCategoriesEmptyList() {
-            FindAllCategoriesResponse findAllCategoriesResponse = sut.findAll();
-
-            assertThat(findAllCategoriesResponse.categories()).isEmpty();
-        }
-    }
-
     @Nested
     @DisplayName("카테고리 단건 조회 테스트")
     class FetchByIdTest {
@@ -172,7 +145,6 @@ class UpdateCategoryTest {
 
         @Test
         @DisplayName("카테고리 수정 성공")
-        @Disabled
         void updateCategorySuccess() {
             String updateCategoryName = "updateName";
             Member member = memberRepository.save(MemberFixture.memberFixture());
diff --git a/backend/src/test/java/codezap/tag/service/TagServiceTest.java b/backend/src/test/java/codezap/tag/service/TagServiceTest.java
index e4589eb7c..99bff6adb 100644
--- a/backend/src/test/java/codezap/tag/service/TagServiceTest.java
+++ b/backend/src/test/java/codezap/tag/service/TagServiceTest.java
@@ -1,14 +1,12 @@
 package codezap.tag.service;
 
 import static org.assertj.core.api.Assertions.assertThat;
-import static org.assertj.core.api.Assertions.assertThatThrownBy;
 import static org.junit.jupiter.api.Assertions.assertAll;
 
 import java.util.Arrays;
 import java.util.Collections;
 import java.util.List;
 
-import org.junit.jupiter.api.Disabled;
 import org.junit.jupiter.api.DisplayName;
 import org.junit.jupiter.api.Nested;
 import org.junit.jupiter.api.Test;
@@ -19,7 +17,6 @@
 import codezap.fixture.MemberFixture;
 import codezap.fixture.TemplateFixture;
 import codezap.global.ServiceTest;
-import codezap.global.exception.CodeZapException;
 import codezap.member.domain.Member;
 import codezap.tag.domain.Tag;
 import codezap.tag.dto.response.FindAllTagsResponse;
@@ -143,72 +140,6 @@ void findAllByTemplate_WhenNotExistTemplateTag() {
             // when & then
             assertThat(sut.findAllByTemplate(template)).isEmpty();
         }
-
-        @Test
-        @Disabled("현재 InvalidDataAccessApiUsageException 발생하므로 조회 직전에 검증 처리가 필요")
-        @DisplayName("실패: 존재하지 않는 템플릿으로 태그 조회")
-        void findAllByTemplate_WhenNotExistTemplate() {
-            // given
-            Member member = memberRepository.save(MemberFixture.getFirstMember());
-            Category category = categoryRepository.save(CategoryFixture.getFirstCategory());
-            Template unSavedTemplate = TemplateFixture.get(member, category);
-            tagRepository.save(new Tag("tag1"));
-            tagRepository.save(new Tag("tag2"));
-
-            // when & then
-            assertThatThrownBy(() -> sut.findAllByTemplate(unSavedTemplate))
-                    .isInstanceOf(CodeZapException.class)
-                    .hasMessage("템플릿이 존재하지 않아 태그를 조회할 수 없습니다.");
-        }
-    }
-
-    @Nested
-    @DisplayName("템플릿 Id로 태그 조회")
-    class FindAllByTemplateId {
-
-        @Test
-        @DisplayName("성공: 템플릿 Id에 해당하는 태그 목록 반환")
-        void findAllByTemplate() {
-            // given
-            Template template = createSavedTemplate();
-            Tag tag1 = tagRepository.save(new Tag("tag1"));
-            Tag tag2 = tagRepository.save(new Tag("tag2"));
-            TemplateTag templateTag1 = templateTagRepository.save(new TemplateTag(template, tag1));
-            TemplateTag templateTag2 = templateTagRepository.save(new TemplateTag(template, tag2));
-
-            // when & then
-            assertThat(sut.findAllByTemplateId(template.getId()))
-                    .containsExactly(templateTag1.getTag(), templateTag2.getTag());
-        }
-
-        @Test
-        @DisplayName("성공: 템플릿에 해당하는 태그가 없는 경우 빈 목록 반환")
-        void findAllByTemplate_WhenNotExistTemplateTag() {
-            // given
-            Template template = createSavedTemplate();
-            tagRepository.save(new Tag("tag1"));
-            tagRepository.save(new Tag("tag2"));
-
-            // when & then
-            assertThat(sut.findAllByTemplateId(template.getId())).isEmpty();
-        }
-
-        @Test
-        @Disabled("현재 InvalidDataAccessApiUsageException 발생하므로 조회 직전에 검증 처리가 필요")
-        @DisplayName("실패: 존재하지 않는 템플릿으로 태그 조회")
-        void findAllByTemplate_WhenNotExistTemplate() {
-            // given
-            Member member = memberRepository.save(MemberFixture.getFirstMember());
-            Category category = categoryRepository.save(CategoryFixture.getFirstCategory());
-            Template unSavedTemplate = TemplateFixture.get(member, category);
-            tagRepository.save(new Tag("tag1"));
-            tagRepository.save(new Tag("tag2"));
-
-            // when & then
-            assertThatThrownBy(() -> sut.findAllByTemplateId(unSavedTemplate.getId()))
-                    .isInstanceOf(CodeZapException.class)
-                    .hasMessage("템플릿이 존재하지 않아 태그를 조회할 수 없습니다.");
-        }
     }
 
     @Nested
diff --git a/backend/src/test/java/codezap/template/controller/TemplateControllerTest.java b/backend/src/test/java/codezap/template/controller/TemplateControllerTest.java
index 015324847..dddb320f7 100644
--- a/backend/src/test/java/codezap/template/controller/TemplateControllerTest.java
+++ b/backend/src/test/java/codezap/template/controller/TemplateControllerTest.java
@@ -233,7 +233,7 @@ private static CreateTemplateRequest createRequestWithNullVisibility() {
 
         @ParameterizedTest
         @DisplayName("템플릿 생성 실패: 잘못된 소스 코드 순서 입력 시 400 반환")
-        @CsvSource({"0, 1", "1, 3", "2, 1"})
+        @CsvSource({"0, 1", "1, 3"})
         void createTemplateFailWithWrongSourceCodeOrdinal(int firstIndex, int secondIndex) throws Exception {
             CreateTemplateRequest templateRequest = new CreateTemplateRequest("title", "description",
                     List.of(new CreateSourceCodeRequest("title", "content", firstIndex),
@@ -545,7 +545,7 @@ private static UpdateTemplateRequest createUpdateRequestWithNullTags() {
 
         @ParameterizedTest
         @DisplayName("템플릿 수정 실패: 잘못된 소스 코드 순서 입력")
-        @CsvSource({"1, 2, 1", "3, 2, 1", "0, 2, 1"})
+        @CsvSource({"1, 2, 1", "1, 3, 4", "0, 2, 1"})
         void updateTemplateFailWithWrongSourceCodeOrdinal(int createOrdinal1, int createOrdinal2, int updateOrdinal)
                 throws Exception {
             // given
diff --git a/backend/src/test/java/codezap/template/repository/TemplateRepositoryTest.java b/backend/src/test/java/codezap/template/repository/TemplateRepositoryTest.java
index 62af68996..3c92b8383 100644
--- a/backend/src/test/java/codezap/template/repository/TemplateRepositoryTest.java
+++ b/backend/src/test/java/codezap/template/repository/TemplateRepositoryTest.java
@@ -76,28 +76,6 @@ void fetchById_WhenNotExistsId() {
         }
     }
 
-    @Nested
-    @DisplayName("회원 id로 템플릿 조회")
-    class FindByMemberId {
-
-        @Test
-        @DisplayName("회원 id로 템플릿 조회 성공")
-        void findByMemberId() {
-            Member member = memberRepository.save(MemberFixture.getFirstMember());
-            Category category = categoryRepository.save(CategoryFixture.getFirstCategory());
-            Template savedTemplate = templateRepository.save(TemplateFixture.get(member, category));
-
-            assertThat(templateRepository.findByMemberId(member.getId())).containsExactly(savedTemplate);
-        }
-
-        @Test
-        @DisplayName("회원 id로 템플릿 조회 실패: 존재하지 않는 회원")
-        void findByMemberIdWhenNotExistsMember() {
-            Long notSavedId = 1L;
-            assertThat(templateRepository.findByMemberId(notSavedId)).isEmpty();
-        }
-    }
-
     @Nested
     @DisplayName("회원이 좋아요한 템플릿 조회 테스트")
     class FindAllByMemberId {
diff --git a/backend/src/test/java/codezap/template/service/SourceCodeServiceTest.java b/backend/src/test/java/codezap/template/service/SourceCodeServiceTest.java
index 49517fcf3..a1722989e 100644
--- a/backend/src/test/java/codezap/template/service/SourceCodeServiceTest.java
+++ b/backend/src/test/java/codezap/template/service/SourceCodeServiceTest.java
@@ -7,7 +7,6 @@
 import java.util.Collections;
 import java.util.List;
 
-import org.junit.jupiter.api.Disabled;
 import org.junit.jupiter.api.DisplayName;
 import org.junit.jupiter.api.Nested;
 import org.junit.jupiter.api.Test;
@@ -26,6 +25,7 @@
 import codezap.template.domain.Thumbnail;
 import codezap.template.domain.Visibility;
 import codezap.template.dto.request.CreateSourceCodeRequest;
+import codezap.template.dto.request.CreateTemplateRequest;
 import codezap.template.dto.request.UpdateSourceCodeRequest;
 import codezap.template.dto.request.UpdateTemplateRequest;
 
@@ -47,7 +47,7 @@ void createSourceCodes() {
             CreateSourceCodeRequest request2 = new CreateSourceCodeRequest("file2.java", "content2", 2);
 
             // when
-            sourceCodeService.createSourceCodes(template, List.of(request1, request2));
+            sourceCodeService.createSourceCodes(template, createSavedTemplateRequest(List.of(request1, request2)));
 
             // then
             List<SourceCode> sourceCodes = sourceCodeRepository.findAllByTemplate(template);
@@ -61,7 +61,6 @@ void createSourceCodes() {
         }
 
         @Test
-        @Disabled("애플리케이션 코드에서 검증 코드 작성 필요")
         @DisplayName("실패: 순서 중복된 코드 존재")
         void createSourceCodes_WhenOrdinalIsDuplicate() {
             // given
@@ -70,17 +69,14 @@ void createSourceCodes_WhenOrdinalIsDuplicate() {
             CreateSourceCodeRequest request1 = new CreateSourceCodeRequest("file1.java", "content1", sameOrdinal);
             CreateSourceCodeRequest request2 = new CreateSourceCodeRequest("file2.java", "content2", sameOrdinal);
 
-            // when
-            sourceCodeService.createSourceCodes(template, List.of(request1, request2));
-
-            // then
-            assertThatThrownBy(() -> sourceCodeRepository.findAllByTemplate(template))
+            // when & then
+            assertThatThrownBy(() -> sourceCodeService.createSourceCodes(
+                    template, createSavedTemplateRequest(List.of(request1, request2))))
                     .isInstanceOf(CodeZapException.class)
-                    .hasMessage("소스 코드의 순서는 중복될 수 없습니다.");
+                    .hasMessage("소스 코드 순서가 잘못되었습니다.");
         }
 
         @Test
-        @Disabled("애플리케이션 코드에서 검증 코드 작성 필요")
         @DisplayName("실패: 순서가 1부터 시작하지 않는 소스 코드")
         void createSourceCodes_WhenOrdinalIsNotStart1() {
             // given
@@ -88,17 +84,14 @@ void createSourceCodes_WhenOrdinalIsNotStart1() {
             CreateSourceCodeRequest request1 = new CreateSourceCodeRequest("file1.java", "content1", 0);
             CreateSourceCodeRequest request2 = new CreateSourceCodeRequest("file2.java", "content2", 1);
 
-            // when
-            sourceCodeService.createSourceCodes(template, List.of(request1, request2));
-
-            // then
-            assertThatThrownBy(() -> sourceCodeRepository.findAllByTemplate(template))
+            // when & then
+            assertThatThrownBy(() -> sourceCodeService.createSourceCodes(
+                    template, createSavedTemplateRequest(List.of(request1, request2))))
                     .isInstanceOf(CodeZapException.class)
-                    .hasMessage("소스 코드의 순서는 1부터 시작해야 합니다.");
+                    .hasMessage("소스 코드 순서가 잘못되었습니다.");
         }
 
         @Test
-        @Disabled("애플리케이션 코드에서 검증 코드 작성 필요")
         @DisplayName("실패: 소스 코드의 순서들이 연속적이지 않은 경우")
         void createSourceCodes_WhenOrdinalIsNotSort() {
             // given
@@ -107,9 +100,10 @@ void createSourceCodes_WhenOrdinalIsNotSort() {
             CreateSourceCodeRequest request2 = new CreateSourceCodeRequest("file2.java", "content2", 3);
 
             // when & then
-            assertThatThrownBy(() -> sourceCodeService.createSourceCodes(template, List.of(request1, request2)))
+            assertThatThrownBy(() -> sourceCodeService.createSourceCodes(
+                    template, createSavedTemplateRequest(List.of(request1, request2))))
                     .isInstanceOf(CodeZapException.class)
-                    .hasMessage("소스 코드의 순서는 1부터 시작해야 합니다.");
+                    .hasMessage("소스 코드 순서가 잘못되었습니다.");
         }
     }
 
@@ -179,21 +173,21 @@ void findSourceCodesByTemplate_WhenSourceCodeNotExist() {
     class UpdateSourceCodes {
 
         @Test
-        @Disabled("애플리케이션 코드에서 로직 변경 필요")
-        @DisplayName("성공: 일부 소스 코드 삭제 및 새로운 소스 코드 추가 시, 삭제된 코드 순서는 앞당겨지고 새로 추가된 소스 코드의 순서는 가장 마지막 순서")
-        void updateSourceCodes_WhenDeleteSomeAndAddNew_ExistingCodesHavePriority() {
+        @DisplayName("성공: 기존 소스 코드 제목, 내용 수정 및 새로운 소스 코드 추가")
+        void updateSourceCodes() {
             // given
             Template template = createSavedTemplate();
             SourceCode sourceCode1 = sourceCodeRepository.save(SourceCodeFixture.get(template, 1));
-            SourceCode deleteSourceCode = sourceCodeRepository.save(SourceCodeFixture.get(template, 2));
+            SourceCode sourceCode2 = sourceCodeRepository.save(SourceCodeFixture.get(template, 2));
             Thumbnail thumbnail = thumbnailRepository.save(new Thumbnail(template, sourceCode1));
 
             UpdateSourceCodeRequest updateRequest1 = getUpdateSourceCodeRequest(sourceCode1);
+            UpdateSourceCodeRequest updateRequest2 = getUpdateSourceCodeRequest(sourceCode2);
             CreateSourceCodeRequest createRequest = new CreateSourceCodeRequest("새로운 제목1", "새로운 내용1", 3);
             UpdateTemplateRequest updateTemplateRequest = getUpdateTemplateRequest(
                     List.of(createRequest),
-                    List.of(updateRequest1),
-                    List.of(deleteSourceCode.getId()),
+                    List.of(updateRequest1, updateRequest2),
+                    Collections.emptyList(),
                     template.getCategory().getId(),
                     Collections.emptyList()
             );
@@ -202,24 +196,26 @@ void updateSourceCodes_WhenDeleteSomeAndAddNew_ExistingCodesHavePriority() {
             sourceCodeService.updateSourceCodes(updateTemplateRequest, template, thumbnail);
 
             // then
+            SourceCode updatedSourceCode1 = sourceCodeRepository.fetchById(sourceCode1.getId());
+            SourceCode updatedSourceCode2 = sourceCodeRepository.fetchById(sourceCode2.getId());
+            SourceCode newSourceCode = sourceCodeRepository.fetchByTemplateAndOrdinal(template, 3);
+
             assertAll(
-                    () -> assertThat(sourceCodeRepository.countByTemplate(template)).isEqualTo(2),
-                    () -> assertThat(sourceCodeRepository.fetchByTemplateAndOrdinal(template, 2).getFilename())
-                            .isEqualTo("새로운 제목1"),
-                    () -> assertThatThrownBy(() -> sourceCodeRepository.fetchById(deleteSourceCode.getId()))
-                            .isInstanceOf(CodeZapException.class)
-                            .hasMessage("식별자 " + deleteSourceCode.getId() + "에 해당하는 소스 코드가 존재하지 않습니다.")
-            );
+                    () -> assertThat(sourceCodeRepository.countByTemplate(template)).isEqualTo(3),
+                    () -> assertThat(updatedSourceCode1.getFilename()).isEqualTo("변경된 제목1"),
+                    () -> assertThat(updatedSourceCode1.getOrdinal()).isEqualTo(1),
+                    () -> assertThat(updatedSourceCode2.getFilename()).isEqualTo("변경된 제목2"),
+                    () -> assertThat(updatedSourceCode2.getOrdinal()).isEqualTo(2),
+                    () -> assertThat(newSourceCode.getFilename()).isEqualTo("새로운 제목1"));
         }
 
         @Test
-        @Disabled("애플리케이션 코드에서 로직 변경 필요")
         @DisplayName("성공: 썸네일 코드 삭제 시, 새로 순서가 1인 코드가 썸네일으로 등록")
         void updateSourceCodes_WhenDeleteThumbnailCode_NewThumbnailAssigned() {
             // given
             Template template = createSavedTemplate();
             SourceCode thumbnailSourceCode = sourceCodeRepository.save(SourceCodeFixture.get(template, 1));
-            SourceCode othersourceCode = sourceCodeRepository.save(SourceCodeFixture.get(template, 2));
+            SourceCode othersourceCode = sourceCodeRepository.save(SourceCodeFixture.get(template, 1));
             Thumbnail thumbnail = thumbnailRepository.save(new Thumbnail(template, thumbnailSourceCode));
 
             List<Long> deleteSourceCodeIds = List.of(thumbnailSourceCode.getId());
@@ -252,8 +248,8 @@ void updateSourceCodes_WhenChangeOrderToLast_AndAddNewCode() {
             SourceCode sourceCode2 = sourceCodeRepository.save(SourceCodeFixture.get(template, 2));
             Thumbnail thumbnail = thumbnailRepository.save(new Thumbnail(template, sourceCode1));
 
-            UpdateSourceCodeRequest ordinalUpdateRequest = new UpdateSourceCodeRequest(sourceCode1.getId(), "변경된 제목1",
-                    "변경된 내용1", 3);
+            UpdateSourceCodeRequest ordinalUpdateRequest = new UpdateSourceCodeRequest(
+                    sourceCode1.getId(), "변경된 제목1", "변경된 내용1", 3);
             UpdateSourceCodeRequest updateRequest2 = getUpdateSourceCodeRequest(sourceCode2);
             CreateSourceCodeRequest createRequest = new CreateSourceCodeRequest("새로운 제목3", "새로운 내용3",
                     sourceCode1.getOrdinal());
@@ -277,7 +273,6 @@ void updateSourceCodes_WhenChangeOrderToLast_AndAddNewCode() {
         }
 
         @Test
-        @Disabled("현재는 전체 삭제를 막지 않고 thumbnail으로 인해 DataIntegrityViolationException 발생, 애플리케이션 코드에서 로직 변경 필요")
         @DisplayName("실패: 템플릿의 전체 소스 코드 삭제는 불가능함")
         void updateSourceCodes_WhenDeleteAll() {
             // given
@@ -297,9 +292,10 @@ void updateSourceCodes_WhenDeleteAll() {
             );
 
             // when & then
-            assertThatThrownBy(() -> sourceCodeService.updateSourceCodes(updateTemplateRequest, template, thumbnail))
+            assertThatThrownBy(
+                    () -> sourceCodeService.updateSourceCodes(updateTemplateRequest, template, thumbnail))
                     .isInstanceOf(CodeZapException.class)
-                    .hasMessage("소스 코드는 최소 1개 이상 존재해야 합니다.");
+                    .hasMessage("소스 코드는 최소 1개 입력해야 합니다.");
         }
 
         @Test
@@ -321,19 +317,19 @@ void updateSourceCodes_WhenNotContainsAny_UpdateOrDelete() {
             );
 
             // when & then
-            assertThatThrownBy(() -> sourceCodeService.updateSourceCodes(updateTemplateRequest, template, thumbnail))
+            assertThatThrownBy(
+                    () -> sourceCodeService.updateSourceCodes(updateTemplateRequest, template, thumbnail))
                     .isInstanceOf(CodeZapException.class)
                     .hasMessage("소스 코드의 정보가 정확하지 않습니다.");
         }
 
         @Test
-        @Disabled("중복이어도 저장되고 있음, 애플리케이션 코드에서 로직 변경 필요")
         @DisplayName("실패: 변경할 소스 코드의 순서가 중복된 소스 코드의 순서인 경우")
         void updateSourceCodes_WhenDuplicateOrder() {
             // given
             Template template = createSavedTemplate();
             SourceCode sourceCode1 = sourceCodeRepository.save(SourceCodeFixture.get(template, 1));
-            SourceCode sourceCode2 = sourceCodeRepository.save(SourceCodeFixture.get(template, 2));
+            SourceCode sourceCode2 = sourceCodeRepository.save(SourceCodeFixture.get(template, 1));
             Thumbnail thumbnail = thumbnailRepository.save(new Thumbnail(template, sourceCode1));
 
             UpdateSourceCodeRequest updateRequest1 = getUpdateSourceCodeRequest(sourceCode1);
@@ -348,9 +344,10 @@ void updateSourceCodes_WhenDuplicateOrder() {
             );
 
             // when & then
-            assertThatThrownBy(() -> sourceCodeService.updateSourceCodes(updateTemplateRequest, template, thumbnail))
+            assertThatThrownBy(
+                    () -> sourceCodeService.updateSourceCodes(updateTemplateRequest, template, thumbnail))
                     .isInstanceOf(CodeZapException.class)
-                    .hasMessage("소스 코드의 순서는 중복될 수 없습니다.");
+                    .hasMessage("소스 코드 순서가 잘못되었습니다.");
         }
 
         private UpdateSourceCodeRequest getUpdateSourceCodeRequest(SourceCode sourceCode) {
@@ -438,4 +435,16 @@ private Template createSavedTemplate() {
         Category category = categoryRepository.save(CategoryFixture.getFirstCategory());
         return templateRepository.save(TemplateFixture.get(member, category));
     }
+
+    private CreateTemplateRequest createSavedTemplateRequest(List<CreateSourceCodeRequest> requests) {
+        return new CreateTemplateRequest(
+                "title",
+                "description",
+                requests,
+                1,
+                1L,
+                List.of(),
+                Visibility.PUBLIC
+        );
+    }
 }
diff --git a/backend/src/test/java/codezap/template/service/TemplateSearchServiceTest.java b/backend/src/test/java/codezap/template/service/TemplateSearchServiceTest.java
index f471971e6..d52da6ec1 100644
--- a/backend/src/test/java/codezap/template/service/TemplateSearchServiceTest.java
+++ b/backend/src/test/java/codezap/template/service/TemplateSearchServiceTest.java
@@ -1,13 +1,11 @@
 package codezap.template.service;
 
 import static org.assertj.core.api.Assertions.assertThat;
-import static org.assertj.core.api.Assertions.assertThatThrownBy;
 import static org.junit.jupiter.api.Assertions.assertAll;
 
 import java.util.List;
 
 import org.junit.jupiter.api.BeforeEach;
-import org.junit.jupiter.api.Disabled;
 import org.junit.jupiter.api.DisplayName;
 import org.junit.jupiter.api.Nested;
 import org.junit.jupiter.api.Test;
@@ -23,7 +21,6 @@
 import codezap.fixture.MemberFixture;
 import codezap.fixture.TemplateFixture;
 import codezap.global.DatabaseIsolation;
-import codezap.global.exception.CodeZapException;
 import codezap.global.pagination.FixedPage;
 import codezap.member.domain.Member;
 import codezap.member.repository.MemberRepository;
@@ -112,22 +109,6 @@ void findAllSuccessByMemberId() {
                     .toArray(Template[]::new));
         }
 
-        @Test
-        @Disabled("Pageable에 대한 null 검증이 필요함")
-        @DisplayName("검색 기능 실패: Pageable을 전달하지 않은 경우")
-        void findAllFailureWithNullPageable() {
-            Long memberId = member1.getId();
-            String keyword = null;
-            Long categoryId = null;
-            List<Long> tagIds = null;
-            Visibility visibility = null;
-            Pageable pageable = null;
-
-            assertThatThrownBy(() -> sut.findAllBy(memberId, keyword, categoryId, tagIds, visibility, pageable))
-                    .isInstanceOf(CodeZapException.class)
-                    .hasMessage("Pageable을 필수로 작성해야 합니다.");
-        }
-
         @ParameterizedTest
         @DisplayName("검색 기능: 키워드로 템플릿 목록 조회 성공")
         @ValueSource(strings = {"안녕", "+안녕", "안+녕", " 안녕", "안녕+", "안녕-", "-안녕"})
diff --git a/backend/src/test/java/codezap/template/service/TemplateServiceTest.java b/backend/src/test/java/codezap/template/service/TemplateServiceTest.java
index 08ef8ba3b..e1f07ea0c 100644
--- a/backend/src/test/java/codezap/template/service/TemplateServiceTest.java
+++ b/backend/src/test/java/codezap/template/service/TemplateServiceTest.java
@@ -110,39 +110,6 @@ void getByIdFailWithWrongId() {
         }
     }
 
-    @Nested
-    @DisplayName("멤버 ID로 템플릿 조회")
-    class GetByMemberId {
-
-        @Test
-        @DisplayName("멤버 id로 템플릿 조회 성공")
-        void getByMemberIdSuccess() {
-            var member1 = memberRepository.save(MemberFixture.getFirstMember());
-            var member2 = memberRepository.save(MemberFixture.getSecondMember());
-            var category1 = categoryRepository.save(CategoryFixture.getFirstCategory());
-            var category2 = categoryRepository.save(CategoryFixture.getSecondCategory());
-            var template1 = templateRepository.save(TemplateFixture.get(member1, category1));
-            var template2 = templateRepository.save(TemplateFixture.get(member1, category1));
-            var template3 = templateRepository.save(TemplateFixture.get(member2, category2));
-
-            var actual = sut.getByMemberId(member1.getId());
-
-            assertThat(actual).hasSize(2)
-                    .containsExactly(template1, template2)
-                    .doesNotContain(template3);
-        }
-
-        @Test
-        @DisplayName("멤버 ID로 템플릿 조회 성공: 해당하는 템플릿이 없는 경우 빈 목록 반환")
-        void getByMemberIdSuccessWithEmptyList() {
-            var memberId = 100L;
-
-            var actual = sut.getByMemberId(memberId);
-
-            assertThat(actual).isEmpty();
-        }
-    }
-
     @Nested
     @DisplayName("정렬 기능 테스트")
     class SortTest {
diff --git a/backend/src/test/java/codezap/template/service/facade/TemplateApplicationServiceTest.java b/backend/src/test/java/codezap/template/service/facade/TemplateApplicationServiceTest.java
index a7a99f0b9..7bd7fe50f 100644
--- a/backend/src/test/java/codezap/template/service/facade/TemplateApplicationServiceTest.java
+++ b/backend/src/test/java/codezap/template/service/facade/TemplateApplicationServiceTest.java
@@ -9,12 +9,8 @@
 import java.time.LocalDateTime;
 import java.util.Collections;
 import java.util.List;
-import java.util.concurrent.ExecutorService;
-import java.util.concurrent.Executors;
-import java.util.concurrent.TimeUnit;
 import java.util.stream.Stream;
 
-import org.junit.jupiter.api.Disabled;
 import org.junit.jupiter.api.DisplayName;
 import org.junit.jupiter.api.Nested;
 import org.junit.jupiter.api.Test;
@@ -35,7 +31,6 @@
 import codezap.global.exception.ErrorCode;
 import codezap.likes.domain.Likes;
 import codezap.member.domain.Member;
-import codezap.tag.domain.Tag;
 import codezap.template.domain.SourceCode;
 import codezap.template.domain.Template;
 import codezap.template.domain.Thumbnail;
@@ -86,37 +81,6 @@ void createTemplate_Fail_NoAuthorization() {
                     .hasMessage("해당 카테고리를 수정 또는 삭제할 권한이 없는 유저입니다.");
         }
 
-        @Test
-        @Disabled("@Transactional 과 함께 사용 시 처리 불가능")
-        @DisplayName("동시성 테스트 - 태그 중복이 발생하지 않는지 확인")
-        void createTagsConcurrencyTest() throws InterruptedException {
-            // Given
-            var member = memberRepository.save(MemberFixture.getFirstMember());
-            var category = categoryRepository.save(CategoryFixture.getFirstCategory());
-            CreateTemplateRequest createTemplateRequest = createTemplateRequest(category);
-
-            var member2 = memberRepository.save(MemberFixture.getSecondMember());
-            var category2 = categoryRepository.save(CategoryFixture.getSecondCategory());
-            CreateTemplateRequest createTemplateRequest2 = createTemplateRequest(category2);
-
-            // When
-            ExecutorService executorService = Executors.newFixedThreadPool(2);
-
-            executorService.execute(() -> sut.create(member, createTemplateRequest));
-            executorService.execute(() -> sut.create(member2, createTemplateRequest2));
-
-            executorService.shutdown();
-            executorService.awaitTermination(30, TimeUnit.SECONDS);
-
-            // Then
-            List<Tag> tags = tagRepository.findAllByNames(List.of("Spring"));
-            assertAll(
-                    () -> assertThat(tags).hasSize(1),
-                    () -> assertThat(templateRepository.findByMemberId(member.getId())).isNotEmpty(),
-                    () -> assertThat(templateRepository.findByMemberId(member2.getId())).isNotEmpty()
-            );
-        }
-
         private static CreateTemplateRequest createTemplateRequest(Category category) {
             var title = "title1";
             var description = "description1";