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.