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RAJ KALWAR

@rajkalwar

Message

Software Engineer specializing in secure Java microservices for fintech payments.

United States

Message

What I'm looking for

I’m looking for secure, high-availability fintech environments where I can build Java/Spring microservices and REST APIs, improve database performance, and grow in enterprise-grade software—leveraging my Agile, Linux, and Active Secret Security Clearance background.

I’m a Software Engineer with 3 years of professional experience in fintech and digital payment platforms, specializing in Java-based backend and full-stack development in high-availability financial systems. I build secure RESTful APIs and microservices that support secure transaction processing, payment lifecycle management, and financial data integrity.

Across SoFi Technologies, Instamojo, and Yubi, I’ve designed scalable modular services with Spring Framework/Spring Boot, refactored legacy modules to reduce latency, and optimized MySQL/PostgreSQL for transaction-heavy performance using indexing and query tuning. I’m experienced with Agile, Git/GitHub, Linux production systems, and structured debugging, and I bring an Active Secret Security Clearance through my U.S. Army Reserve service.

Experience

Work history, roles, and key accomplishments

Current

Service Member

Current

United States Army Reserve

Apr 2025 - Present (1 year 3 months)

Served as a U.S. Army Reserve Service Member, completing Basic Combat Training and Advanced Individual Training. Demonstrated discipline, structured execution, and adherence to security protocols while following standard operating procedures.

Standard Operating Procedures

Current

Full Stack Java Developer

Current

SoFi Technologies

Nov 2024 - Present (1 year 8 months)

Designed and developed full-stack fintech applications using Java and Spring Boot within a microservices architecture. Built secure RESTful APIs and supported backend deployment/monitoring in Linux, while optimizing SQL queries for high-volume transactional processing.

Java Spring Boot Spring Framework Microservices REST APIs HTML5 CSS3 JavaScript MySQL PostgreSQL SQL Git GitHub IntelliJ IDEA Linux Agile

Software Engineer

Instamojo

Jul 2023 - Jul 2024 (1 year)

Developed backend payment processing services using Java and Spring Framework to support merchant onboarding and transaction lifecycle workflows. Implemented RESTful APIs for secure order management and payment validation, including database schema/query optimization and production issue resolution.

Java Spring Framework Spring Boot Microservices REST APIs MySQL PostgreSQL SQL Git GitHub IntelliJ IDEA Eclipse Linux Agile

Software Engineering

Yubi

Feb 2023 - Jun 2023 (4 months)

Supported development and maintenance of application components using Java, Python, and JavaScript. Assisted with REST-based service interactions, worked with MySQL/PostgreSQL, and contributed to debugging and functional testing using Git-based collaboration.