Designed and built RESTful APIs for an internal management system covering warehouse and auto garage operations, deployed and actively used in production.
Implemented role-based access control (RBAC) for multi-role authorization and Redis caching to optimize query performance.
Collaborated with a team of 5, contributing frontend features in Next.js alongside backend development.

Fullstack Developer

Built core appointment booking and scheduling workflows (availability checks, recurring rules, rescheduling, cancellations) for a multi-tenant SaaS platform serving the beauty industry.
Migrated appointment service storage from JSONB to relational tables, improving query integrity and performance.
Implemented presigned uploads to Cloudflare R2, reducing backend bandwidth by ~95%.
Built a SSE-based real-time notification system supporting 500+ concurrent connections across isolated per-store event streams, with reconnect handling and graceful cleanup.
Developed appointment-integrated POS checkout flows covering draft orders, payment metadata, and per-store invoice generation.
Technologies: TypeScript, NestJS, PostgreSQL, Redis, Bull Queue, Cloudflare R2

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