Freelance · 2025
TAN
Car marketplace & short-video platform
Overview
The backend for a car-marketplace and short-video app. A Fastify and TypeScript service split into 16 modules (listings, reels, chat, payments, calls) over a 50-table PostgreSQL database with Prisma.
RoleBackend Developer
Year2025
Stack
- Fastify
- TypeScript
- PostgreSQL
- Prisma
- Redis
- BullMQ
- WebSockets
- S3
- Bunny CDN
- FFmpeg / HLS
- 01Split the backend into 16 modules over a 50-table Postgres database with Prisma: listings, reels, chat, payments, calls, and more.
- 02Built a video pipeline where each upload is transcoded once into 360p / 720p / 1080p HLS. The heavy FFmpeg work runs in its own worker container so it never blocks the API, with retry-or-fail handling per error.
- 03Videos upload straight to S3 from the browser in parts, so the API never touches raw files. Finished HLS is pushed to S3 / MinIO and served through a Bunny CDN.
- 04Did real-time chat and notifications over WebSockets, with end-to-end encrypted DMs and push notifications via Firebase and Apple.
- 05Handled the social feed, likes, comments, follows and blocks, with feed ranking, trending hashtags, and view counts updated by background jobs on Redis / BullMQ.
- 06Wired up QiCard payments for promoted listings and verified badges, including renewals, refunds, and click / view stats.
- 07Added full-text search across users, listings, and reels, Arabic / English data throughout, HEIC image support, and the moderation tools (reports, appeals, logs).
- 16 modules · 50-table Postgres schema
- One-pass HLS transcoding in an isolated worker
- End-to-end encrypted real-time DMs
- QiCard payments with renewals & refunds