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Integration Developer (Node.js, TypeScript on AWS)

ZensarBengaluru🇮🇳India

Quick overview

SeniorityMid Senior
Work modeHybrid
LocationBengaluru, India
DockerDynamoDBSpringSpring BootGitAWSJavaJestRESTNode.jsTypeScriptCI/CD

Job description

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

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