Senior Backend Engineer – Customer Support Platform
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Job Description
Senior Backend Engineer designing and implementing backend services for customer support operations. Building resilient systems to handle customer interactions and ensure data quality with high availability.
Responsibilities:
- Own the services that keep Strata's customers unblocked — support, exception-handling, and remediation backend.
- Build backend for Expert-in-the-Loop (HITL) queue — APIs to surface low-confidence documents, capture decisions, and resume workflows.
- Design and implement scalable APIs in NestJS/TypeScript and/or FastAPI/Python using Domain-Driven Design (DDD).
- Implement event-driven workflows over SQS with DLQ patterns, exponential backoff, and idempotent processing.
- Model and optimize PostgreSQL schemas (Aurora) with migrations, indexing, and strict tenant isolation.
- Write runbooks for services owned and participate in on-call rotation alongside SRE.
- Collaborate with SRE on SLOs, dashboards, and incident response; with Customer Success on support needs.
Requirements:
- 6+ years backend engineering in production, shipping and operating real services (not just prototypes).
- Strong in at least one, comfortable in both: Node.js/TypeScript (NestJS or equivalent) and Python (FastAPI).
- REST API design, validation, auth, and clean error handling.
- Deep PostgreSQL — schema design, migrations, query optimization, indexing, and multi-tenant isolation / row-level security.
- Event-driven & async patterns — message queues (SQS, Kafka or equivalent), DLQs, retries, idempotency, and designing for partial failure.
- AWS proficiency — Lambda, ECS/Fargate, S3, SQS, API Gateway, RDS/Aurora.
- Reliability mindset — you design for SLOs, instrument for observability (structured logs/metrics/traces, correlation IDs), and have carried a pager.
- Testing discipline — unit + integration + e2e testing (pytest/Jest, moto/localstack, SuperTest), and CI/CD experience.
- Security awareness — authn/authz, rate limiting, input validation, secrets management, and audit logging.
- English proficiency : B2+ required (C1 preferred).
Benefits:
- Health insurance
- 401(k) matching
- Flexible work hours
- Paid time off
- Remote work options
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