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.