Quick-commerce marketplace for study materials
Studeaze had a working product vision and early traction — a zone-aware marketplace connecting students to nearby bookstores — but the legacy React + Spring Boot + MongoDB stack was blocking scale:
Not a line-by-line port — a spec-driven rebuild. The legacy Spring Boot app and Mongo schema were treated as the source of truth, not the implementation to copy: APIs, order lifecycle, zone rules, and catalog shapes mapped before code, with payments made server-authoritative and internal runbooks produced.
One repo, shared conventions, independent deploys — Vercel for frontends, Render/Railway for the API and delivery worker.
Business invariants moved into the database where possible.
A SQL RPC pipeline (reserve stock → set Razorpay order id → confirm or release), HMAC verification on callbacks and webhooks, server-side amount verification against the Razorpay API, and a reconciliation cron for orders stuck mid-checkout.
Porter's booking UI requires an authenticated browser session, Google autocomplete, OTP, and anti-bot protections. We built a dedicated Playwright booking worker with persisted auth state, Google Places alignment, an OTP relay endpoint for sellers, video capture per run, and proxy support — decoupled from the main API so booking failures never take down checkout.
Repeatable Mongo → Postgres ETL preserving nested JSONB, canonical inventory split from per-seller offers, a multi-source cover repair pipeline for broken legacy CDN URLs, and Gemini-powered Devanagari transliteration (~2,600 titles) — all encoded in 160+ versioned SQL migrations.