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Jason Chen
Mid-Level Backend Software Engineer specializing in distributed financial systems
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About
Full-stack engineer with fintech payments experience who shipped an end-to-end guest invoice payment flow emphasizing reliability under retries/failures (idempotency via DynamoDB, async processing with Lambda/EventBridge/SQS + DLQ). Also built a FastAPI backend with Cognito/JWT + scoped guest tokens and a polished React/TypeScript checkout UX, and has performance-focused Postgres/Redis design experience for flash-sale e-commerce workloads.
Experience
Education
Key Strengths
- End-to-end ownership of production fintech features (guest invoice payment flow)
- Reliability engineering for payments (idempotency, strict state validation, exactly-once processing approach)
- Event-driven AWS architecture (Lambda + EventBridge + SQS/DLQ) for async workflows
- Strong API design and security (versioned REST, Pydantic schemas, JWT + Cognito, scoped guest tokens)
- Production observability and operability (structured logs, correlation IDs, metrics/alarms, DLQ auditability)
- Incident/scaling troubleshooting on AWS (diagnosed Lambda throttling and SQS backlog via CloudWatch; tuned concurrency/batching)
- Polished customer-facing UI with robust edge-case handling (expired links, paid invoices, retries, double-submit prevention)
- High-traffic data modeling/performance work (Postgres constraints/indexes; Redis-based flash-sale strategy to reduce locking)
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