Mohan Kumar S

Backend developer with 4.8 years of experience in scalable microservices and cloud-native systems. Skilled in AWS serverless, TypeScript, Node.js, Infrastructure as Code (CDK, Terraform), REST and WebSocket APIs.

Software Engineer 2 at Diligent (2025-10 – Present)

• Designed and implemented scalable backend solutions using AWS Lambda, Step Functions, API Gateway, DynamoDB, S3, and AWS CDK.
• Developed reusable serverless services and automation frameworks using TypeScript, improving engineering productivity.
• Automated infrastructure provisioning and CI/CD using AWS CDK, improving deployment reliability across AWS environments.
• Performed code reviews, mentored team members, and maintained high code quality across backend services.
• Leveraged GitHub Copilot and Cursor to accelerate feature development, debugging, and documentation.

Software Engineer 1 at Diligent (2023-06 – 2025-09)

• Designed and implemented scalable serverless applications using AWS Lambda, API Gateway, DynamoDB, and AWS CDK, supporting real-time WebSocket communication and backend workflows.
• Built multiple AWS Lambda functions for WebSocket handling, notifications, and event-driven processing, ensuring reliable and scalable application performance.
• Developed CLI tools and REST APIs in TypeScript to automate Terraform, JSON, and YAML configuration management, reducing manual effort.
• Improved application observability using CloudWatch and monitoring tools.

Software Engineer at Infogain (2021-10 – 2023-06)

• Designed and developed scalable RESTful APIs using TypeScript, Node.js, and Express.js for a high-volume e-commerce platform.
• Modernized legacy services by migrating them to a serverless AWS architecture using Lambda, API Gateway, and S3, improving scalability and reducing infrastructure complexity.
• Designed backend integrations with MySQL and DynamoDB while implementing CloudWatch monitoring and logging to improve application reliability and production visibility.
• Developed automated unit tests using Jest with 90%+ code coverage, while collaborating with cross-functional teams to deliver new features and resolve production issues.

B.E. in Computer Science – East Point College of Engineering and Technology (2021)