Integration Developer (Node.js, TypeScript on AWS)

We are seeking an Integration Developer to build a containerised gateway service on AWS, using Node.js, TypeScript and Fastify on ECS Fargate. The service routes all transactional email from commerce and order management systems to a new email service provider. The developer will build: a pass-through API a backward-compatible API that converts legacy requests and responses using configurable mappings, so new campaigns can be added without a code release The role covers idempotent processing, retry and failure handling, audit logging, event publishing and tracing, with security, resilience and observability built into the application. Development is OpenAPI-first, uses AI-assisted coding tools and is checked with contract tests built from real traffic. The developer will work closely with the architect, DevOps and QA on a fast build. Required Skills & Competencies • Strong hands-on Node.js and TypeScript backend development, including Fastify (or a similar framework), asynchronous programming, REST/JSON APIs, validation and structured error handling. • Working experience with AWS SDK integrations: DynamoDB, Secrets Manager, SQS/DLQ, and containerised deployment to ECS Fargate. • Practical AI-assisted application development using an approved coding assistant: supplying contract context, iterating on generated code and verifying correctness with tests. • API integration and transformation, legacy contract compatibility, token-based authentication and configuration-driven business mappings. • Unit, API and contract-test development; Git-based peer review, CI/CD integration and production debugging using logs and distributed traces. Idempotency, retry safety, timeout handling, circuit breakers and secure handling of credentials and personal data. Good-to-Have • AWS AppConfig, EventBridge, OpenTelemetry/ADOT, CloudWatch and X-Ray • Jest or an equivalent TypeScript testing framework; Docker • Java / Spring Boot exposure Qualifications • 5–8 years of relevant software development experience, including hands-on backend/API integration delivery. • B.E./B.Tech/MCA or equivalent