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
- 5–8 years of relevant software development experience, including hands-on backend/API integration delivery.
- B.E./B.Tech/MCA or equivalent
Job description provided by Zensar.
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