Backend Engineer - Python / Node.js
About The RoleThe role builds APIs and internal services that clients and their millions of end users depend on daily, with strong Python or Node.js skills at the core.You will work on a team that takes API design, data consistency, and performance seriously. If you want to work on interesting backend problems with real-world financial constraints, this is the role.Key ResponsibilitiesDesign and implement REST APIs using FastAPI or Django (Python) or Express/Fastify (Node.js), with a focus on correctness, latency, and developer experienceOwn system design for new services: define data models, API contracts, error handling strategies, and operational requirements before writing a line of codeWrite and maintain PostgreSQL schemas and queries that perform well at scale; use Redis for caching and rate limiting where appropriateBuild and maintain asynchronous task processing with Celery (Python) or Bull (Node.js) for payment processing, notifications, and compliance workflowsWrite comprehensive automated tests: unit, integration, and contract tests; treat test coverage as a first-class engineering concernParticipate in on-call rotation (fair and infrequent); lead incident investigation and write clear post-mortemsContribute to internal engineering documentation, ADRs, and knowledge-sharing practicesWhat We Are Looking For2–6 years of professional backend engineering experience with Python (FastAPI/Django/Flask) or Node.js (Express/Fastify/NestJS)Strong SQL skills in PostgreSQL or MySQL; understanding of transactions, indexing, and query optimizationExperience with Redis for caching, queueing, or rate limitingFamiliarity with REST API design best practices, versioning strategies, and HTTP performance fundamentalsExperience with Docker and cloud deployment on AWS or GCPClear written communication; can document system design decisions in a way that helps your team six months laterBonus: financial services domain knowledge, Kafka, gRPC, TypeScript, or experience building developer-facing APIsLocationNew York City (Hybrid) San Francisco Bay Area Seattle Austin, TX Remote considered