Senior Backend Developer

Required qualifications: 5+ years professional backend development; 3+ years TypeScript + Node.js in production. NestJS (or strong Express/Fastify background + readiness to work in NestJS). PostgreSQL: schema design, transactions, migrations, indexing. REST API design; validation; structured error handling. JWT, OAuth2, RBAC implemented in production. At least one of the following demonstrated in prior work: - Fintech / wallet / ledger (idempotent webhooks, reconciliation), or - Realtime systems (WebSocket, Redis pub/sub), or - Technical leadership (schema ownership, code review, API contracts). Nice to have: Indian payment gateways and KYC vendor APIs. decimal.js / big.js for money; BullMQ; Prisma; Socket.IO. High-traffic B2C or marketplace backends. Comfort with AI-assisted development and strict review on financial code.