Open to opportunities

Sajan Madaan

@sajanmadaan

Senior software engineer specializing in scalable Java microservices, performance optimization, and reliable production delivery.

India

Message

What I'm looking for

I’m looking for a role where I can build scalable Java systems, optimize performance, and deliver production-ready features. I value clean code, collaboration in Agile teams, and measurable impact like stability improvements and faster APIs.

I’m a Senior Software Engineer with 5+ years of experience building scalable systems, optimizing performance, and delivering production-ready solutions. At PayPal, I led the upgrade of the Raptor framework (v4.5.0 to v4.6.0), refactored complex rules into reusable modules, and collaborated on regression testing to ensure smooth rollouts without service disruption.

Earlier, I helped MyTripsKart design and implement scalable REST APIs with Java and Spring Boot, while integrating frontend and backend services for reliable application behavior. I also drove a transition from monolithic to microservices architecture at Zet (Onecode), improving key API performance by 85% through caching, developing a URL shortener service, integrating multiple bank APIs, and performing code reviews to reduce latency and technical debt.

Experience

Work history, roles, and key accomplishments

Current

Senior Software Engineer

Current

PayPal

Jul 2025 - Present (10 months)

Led the upgrade of the Raptor framework (v4.5.0 to v4.6.0), ensuring cross-service compatibility, improved stability, and better performance. Refactored tightly coupled business rules into reusable modules and coordinated regression testing to support smooth rollouts.

Java Spring Boot REST APIs Performance Tuning AWS EC2 New Relic Git Regression Testing Code Quality

Senior Software Consultant

MyTripsKart

May 2024 - Jun 2025 (1 year 1 month)

Designed and implemented scalable REST APIs using Java and Spring Boot, optimizing data flow and backend communication. Integrated frontend and backend services for reliable end-to-end behavior and delivered features in an Agile environment.

Java Spring Boot REST APIs System Integration Agile Scrum Jira Backend Regression Testing Git

Software Development Engineer I

Zet (Onecode)

May 2022 - Feb 2024 (1 year 9 months)

Led the transition from monolithic architecture to microservices to improve scalability, maintainability, and deployment efficiency. Improved key API performance with caching, reducing response times by 85%, and delivered a URL shortener plus bank API integrations.

Microservices Java Spring MVC REST APIs Caching Redis Git

UI Designer

Consulting Work

Apr 2018 - Apr 2021 (3 years)

Designed visually engaging user interfaces and promotional digital content for Indian and international clients, ensuring brand consistency. Delivered UI work aligned with client goals to improve user engagement.

UI Design HTML CSS React React Native Brand Consistency