Backend Engineer- SaaS platform

Responsibilities:

• Maintain and enhance the backend services powering the SaaS platform ( Node.js/Express/NestJS with TypeScript ).
• Ensure uptime, scalability, and performance of APIs handling campaign generation, template storage, and credit-based billing.
• Optimize MongoDB queries , indexes, and caching strategies for high-performance APIs.
• Implement and manage Redis , job queues, and async workflows.
• Monitor and maintain AWS infrastructure: EC2, S3, CloudWatch, Lambda, SES.
• Implement security best practices : API authentication, rate-limiting, GDPR compliance, email data handling.
• Maintain API versioning and documentation (OpenAPI/Swagger).
• Write unit and integration tests to ensure code quality and reliability.
• Debug and resolve complex production issues efficiently.

Required Skills:

• Strong proficiency in Node.js with TypeScript (Express.js or NestJS).
• Experience with MongoDB , schema design, and ORMs (Mongoose, Prisma).
• Experience with Redis (pub/sub, caching) and job queues (BullMQ/RabbitMQ).
• Familiarity with AWS services : EC2, S3, CloudWatch, SES, Lambda.
• Dockerized microservices and CI/CD pipelines ( GitHub Actions , or similar).
• Knowledge of authentication authorization (JWT, OAuth2, role-based access).
• Basic Logging monitoring experience ( Winston, Pino, Prometheus/Grafana ).
• Unit integration testing experience ( Jest, Mocha, Vitest ).
• Knowledge of email compliance tools (SpamAssassin, DKIM/SPF/DMARC) is a plus.

Experience:

• 3-5 years in backend development.

Prior experience in SaaS applications, high-traffic APIs, or campaign/marketing platforms is preferred.

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