Kumaresan Kajarajithan (Kajan)
Software Engineer
Software Engineer with hands-on experience in full-stack development, mobile application development, backend API engineering, and software quality assurance.
Skilled in Java, Spring Boot, React.js, React Native, TypeScript, REST APIs, and PostgreSQL. Experienced in secure backend systems, JWT authentication, role-based access control, API integration, testing, and Azure deployment.
Interested in building scalable and maintainable software solutions across web, mobile, and cloud platforms.
Engineering Focus & Technical Journey
- Secure Backend Systems: Designing RESTful APIs, relational PostgreSQL schemas, stateless JWT authentication, and Role-Based Access Control (RBAC) in Java and Spring Boot.
- Web & Cross-Platform Mobile: Building responsive web applications with React.js, Next.js, and TypeScript alongside mobile applications in React Native (Expo) and Flutter.
- Quality Assurance & Cloud Deployment: Validating software with Postman API testing and Selenium WebDriver automation, and deploying production services on Azure Ubuntu VMs with PostgreSQL and systemd.
Profile Snapshot
Verified Engineer Profile
- Full Name
- Kumaresan Kajarajithan (Kajan)
- Role
- Software Engineer
- Education
- BSc (Hons) in Applied Computing — University of Jaffna, Sri Lanka (2022–2026)
- Location
- Nelliyady, Jaffna, Sri Lanka
- Career Availability
- Open to Associate Software Engineer, Junior Software Engineer, Full-Stack Developer, and Backend Developer opportunities.
Primary Focus Areas
Backend Engineering
Java, Spring Boot, Node.js, Express.js, REST APIs, JWT authentication, and RBAC.
Web & Mobile Apps
React.js, Next.js, TypeScript, React Native (Expo), and Flutter/Dart mobile applications.
Cloud & Databases
PostgreSQL, MongoDB, MySQL, Supabase, GitHub Actions CI/CD, and Azure Ubuntu VM deployments.
Software QA & Testing
Test case preparation, Postman API/integration testing, Selenium WebDriver, and defect verification.
Looking for an Associate / Junior Software Engineer, Full-Stack, or Backend Developer?
Explore my project architecture breakdowns or reach out directly at k.kajan2001@gmail.com to discuss full-stack, mobile, and backend engineering roles.