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belovedjohndev/README.md

John Paul Libagh

Full-stack custom web developer building production-grade business systems with TypeScript, PostgreSQL, React, Astro, and clean architecture.

I build custom-coded web applications for businesses that need reliable workflows, clear data models, secure access control, and maintainable systems.

What I Build

  • Multi-tenant SaaS platforms
  • Client portals and admin dashboards
  • Lead capture and estimator tools
  • Booking and availability systems
  • Internal business operations tools
  • CRM-style workflows and automation systems

Core Stack

  • Backend: TypeScript, Node.js, Express
  • Database: PostgreSQL, schema-first design, constraints, transactions
  • Frontend: React, Vite, Astro
  • Architecture: Clean/Hexagonal architecture, domain/application/infrastructure separation
  • Security: tenant scoping, authorization, HttpOnly sessions, validation, audit-friendly flows
  • Deployment: Vercel, Render, Neon, Cloudflare, Supabase

Active Projects

Multi-Tenant Estimate Engine

Reusable lead capture and estimate engine for service businesses.

Highlights:

  • Multi-tenant configuration
  • PostgreSQL-backed pricing rules
  • Embeddable widget
  • Lead capture workflow
  • API-driven estimate generation
  • Portal foundation for tenants

Tech: TypeScript, PostgreSQL, React, Vite, Express

Discovery Call Assistant

Private tool for capturing client discovery calls, manual notes, transcript segments, requirements, and structured call history.

Highlights:

  • Tenant-scoped call records
  • Manual and transcript-based note capture
  • Requirement extraction
  • Deterministic sequence numbering
  • Clean frontend/backend separation

Tech: TypeScript, PostgreSQL, React, Vite, Express

Personal Finance Ledger

Transactional income and expense tracking system focused on correctness.

Highlights:

  • Schema-first financial records
  • Database constraints
  • Balance calculation logic
  • Reporting foundation
  • Data integrity rules

Tech: TypeScript, PostgreSQL

Engineering Principles

  • Schema first
  • Explicit domain models
  • Database constraints over app-only assumptions
  • Transactions where correctness matters
  • Tenant scoping and authorization by default
  • Idempotent operations where useful
  • Clear separation between domain, application, infrastructure, and HTTP layers
  • Predictable behavior over hidden magic

Selected Links

Pinned Loading

  1. belovedjohndev-website belovedjohndev-website Public

    Astro portfolio site for custom business systems, client portals, automation, and lead-generation tools.

    Astro

  2. multi-tenant-estimate-engine multi-tenant-estimate-engine Public

    Multi-tenant lead capture and estimate engine with TypeScript, PostgreSQL, tenant configuration, embeddable widget, and API-driven pricing.

    TypeScript

  3. personal-finance-ledger personal-finance-ledger Public

    Transactional income and expense ledger focused on PostgreSQL constraints, reporting logic, and balance correctness.

    PLpgSQL

  4. senmonorom-local-guide senmonorom-local-guide Public

    Local business directory for Sen Monorom with curated listings, category filters, and business-owner submission flow.

    Astro