Back End Developer Mobile App

3 weeks ago

India Budget Caddie Full time
Senior Backend Engineer (Node 20 · TypeScript)

Location: Remote

Type: Full-time — Immediate start

About Budget Caddie

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.

What you'll do

- Build REST APIs from OpenAPI specs: auth, Plaid link/exchange, webhook (fast 202+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.

Must-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).

Why choose us

- 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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