Hari Prasad

About Hari Prasad

I’m a Node js Full-Stack Engineer with 7+ years of experience building, optimizing, and modernizing scalable systems across backend, frontend, and cloud environments.I started my career in 2019 as a Java developer at TCS and intentionally expanded across the stack — moving into Angular for frontend development and later specializing in Node.js with PostgreSQL and MySQL. Over time, I discovered that I genuinely enjoy performance optimization — identifying bottlenecks, improving response times, reducing memory usage, and making systems efficient.At TCS, I worked on cloud-native applications using AWS services such as EC2, API Gateway, S3, and DynamoDB. This exposure helped me understand distributed systems, scalable API design, and production-grade deployments.At ZS, I owned an enterprise platform connecting insurance companies and pharmaceutical manufacturers. I led both frontend and backend development using Angular and Node.js. Along with feature development, I worked heavily on performance tuning — optimizing API response times, improving database query efficiency, reducing frontend rendering overhead, and refining business rule execution.At Epsilon, I led the modernization of a legacy Node.js application that had callback-heavy logic, no connection pooling, and multiple performance and security issues. We reverse-engineered core flows, refactored modules using async/await, introduced structured architecture, implemented connection pooling, and significantly improved stability and throughput.I also drove an AI initiative using AWS Bedrock, Lambda, API Gateway, and S3 to validate PDF content. A key part of my role involved designing rule-based validation layers and AI guardrails to ensure reliable and deterministic outputs.Through this, I explored context engineering — understanding how structured inputs dramatically improve AI effectiveness in real-world systems.What defines me as an engineer: • End-to-end system ownership• Strong backend and API design fundamentals• Cloud-native architecture experience (AWS)• Frontend and backend performance optimization• Legacy modernization expertise• Practical AI integration with structured rule systemsI enjoy solving complex problems, especially when it comes to making systems faster, cleaner, and more maintainable. Building is exciting — but optimizing and evolving real-world systems is where true engineering depth shows.

Experience

1. Senior Associate

   Cognizant

   Feb 2026 — Present · Coimbatore, IN

Education

• Scaler

  Master's degree, Computer Science

• SCAD INSTITUTE OF TECHNOLOGY

  Bachelor of Engineering - BE, Electrical and Electronics Engineering