Frontend systems
Responsive UIs, Expo/React Native mobile features, marketplace browsing flows, patient/admin portals, interactive maps, and component architecture in the Next.js/React ecosystem.Built interfaces for Trackbill (web + mobile), OKRa, Reisky, Apollo Medical Group, PackUp, DemiGAD, and the DTI Iloilo MSME Industry Map.
Next.js · React · React Native · TypeScript
Backend and APIs
REST APIs, Express and Next.js route handlers, OpenAPI contracts, authentication, RBAC, service layers, event-driven notifications, and API validation.Built the Trackbill API-key lifecycle (Express/Prisma/OpenAPI), OKRa RBAC/session validation, PackUp product/order APIs, DTI API-layer access control, and Baylo marketplace data flows.
Node.js · Express.js · Prisma ORM · OpenAPI
Authentication and security
Credential sessions, role- and workspace-scoped authorization, ownership checks, rate limiting, and protected file workflows.Implemented OKRa session versioning and RBAC, PackUp Firebase Admin safeguards, and API-layer access control for DTI.
Auth.js/NextAuth · Firebase Auth · RBAC · Rate limiting
CMS and data
PostgreSQL/Drizzle domain models, Prisma-backed marketplace data, Firebase Firestore utilities, and Sanity CMS/GROQ content pipelines.Built Reisky’s 50-schema Sanity pipeline, OKRa PostgreSQL/Drizzle features, Baylo Prisma/PostgreSQL flows, and DTI Firestore-backed map APIs.
PostgreSQL · Drizzle ORM · Sanity CMS · Firestore
Delivery and quality
Testing, accessibility, SEO, secure file handling, cloud deployment, and production-minded QA.Established a 55-test Reisky suite, contributed to OKRa’s 83-file test suite, and shipped Apollo Medical Group to production in a 2-developer agile team.
Vitest · Playwright · Lighthouse · ESLint