Mobile App Backend Developer

1 day ago

Kolkata, West Bengal, India beBeeBackend Full time ₹ 15,00,000 - ₹ 25,00,000
Job Description

We're building a next-gen personal finance app for Gen Z. Our mission is to transform bank transactions into smart insights and goals users actually act on.

  • Create REST APIs from OpenAPI specs: auth, Plaid link/exchange, webhook (fast + enqueue), transactions list/patch, insights refresh/list.
  • Write SQS workers:
  • Ingestion — Plaid cursor sync, idempotent upserts to Postgres, raw payloads to S3.
  • Insights — Gemini calls with quotas, timeouts, circuit breakers; persist JSON results.
  • Design and evolve Postgres schemas/migrations; implement efficient queries, cursor pagination, and Rediscaching for hot reads.
  • Enforce input validation (AJV/Zod), structured logs (pino), and distributed tracing (OpenTelemetry).
  • Add tests (unit/integration), docs (Postman/OpenAPI examples), and runbooks (queue replay, webhook replay).
  • Collaborate tightly with the Platform/Infra engineer to keep security, performance, and cost in check.
Required Skills and QualificationsMust-haves
  • 5+ years building Node/TypeScript backends with Postgres and a queue (SQS/Rabbit/etc.).
  • Proven experience with secure webhooks (signature/HMAC verification) and third-party APIs.
  • Strong grasp of idempotency, retries/backoff, cursor pagination, error design, and API performance.
  • Comfortable with Docker, GitHub Actions, and observability basics (logs/metrics/traces).
Nice to have
  • Plaid SDK experience; LLM API usage (Gemini/OpenAI); SMS flows (SNS/Twilio).
  • Exposure to Java/Spring or Go (we may introduce JVM/Go for specific future services).
Benefits
  • Ship real features fast—your endpoints and workers power the core experience.
  • Product influence on data models, API contracts, and user-facing behavior.
  • Growth path to technical leadership with meaningful future upside.
  • Modern tooling (OpenAPI-first, OTel tracing, clean CI/CD) and pragmatic culture.
  • Autonomy with quick decisions and direct access to founders.

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