Hi, I'm Mathinraj
Full Stack Developer at Cognizant, building scalable fintech applications with Java, React, and AI-powered development tools.
About Me
Full Stack Developer at Cognizant with 2+ years of experience building enterprise-grade fintech applications. I specialize in Java, Spring Boot, React, and cloud infrastructure — delivering production systems that serve real users at scale.
Outside work, I build and ship products people actually use — from browser extensions with 620+ active users on the Chrome Web Store to open-source tools and PWAs. I'm a relentless learner who thrives on exploring new tools, frameworks, and AI-powered development workflows.
Languages
Frameworks
Tools & Platforms
Cloud & Databases
AI & Other
Java 
Python 
JavaScript 
React 
Spring 
Docker 
Kubernetes 
AWS 
Git 
PostgreSQL 
HTML5 
CSS3 
Tailwind 
Jenkins 
ArgoCD 
C Claude Certified Architect — Professional
Claude Certified Architect — Foundations
Full Stack Developer Program
Cognizant Academy — Spring Boot, React, SQL
B.E. Electrical & Electronics Engineering
Kongu Engineering College
Higher Secondary
Malar Matriculation Hr Sec School
Experience
Junior Software Engineer
Building and maintaining enterprise fintech applications for a Fortune 500 client, working across the full stack with microservices architecture.
- Developed an AI-powered campaign management tool that automates the entire workflow for marketing teams — from PPT upload to landing page generation via Figma designs, reducing campaign launch time from days to minutes
- Built an automated security compliance remediation tool (Antidote) that fetches Jira tickets, identifies compliance issues, applies fixes, and updates Jira — streamlining repetitive monthly security tasks across the team
- Work daily with Spring Boot microservices, React UIs, Kubernetes clusters, Jenkins CI/CD pipelines, and AWS services (EC2, RDS, IAM, DynamoDB)
Software Engineer Trainee
Completed intensive Full Stack Developer program at Cognizant Academy, building real-world applications from day one.
- Built SmartSpend — a full-stack expense tracker with Spring Boot backend and React UI, later evolved into SpendTrak (a PWA with 100% offline-first architecture)
- Trained in Spring Boot, Spring Security, React, SQL, and modern development workflows
Assistant Engineer / Trainee
Contributed to engineering operations in an industrial manufacturing environment. Developed internal automation tools to streamline recurring manual processes.
Featured Projects
From published browser extensions to full-stack apps and AI tools
AIArena
Multi-LLM Comparison ToolWeb app that queries multiple Large Language Models in parallel and streams their responses side by side, enabling real-time comparison of AI model outputs.
Browser Extensions
Extensions I've built and published, used by real people daily
Achievements & Awards
Hall of Fame — Emerging Talent Award
ProfessionalRecognized as one of the monthly winners in the Emerging Talent (PA & A) category for outstanding dedication, innovation, and commitment to excellence.
Second Prize — Codeville
AcademicSecured second place in the Codeville inter-college coding competition.
Best Performer in Coding Contest
AcademicAwarded Department Level Best Performer in the annual coding contest.
Profiles & Publications
LeetCode
212 Problems SolvedHackerRank
7 Badges · Java ★5 · React ★5GitHub
319 Contributions · ActiveMedium
Technical WritingIEEE Publications
Automatic Flood Alert System Using IoT
9th International Conference on Electrical Energy Systems (ICEES), IEEEIoT-based solution for flash flood risk mitigation from hydroelectric dams. A centralized database connects national hydropower stations, automating alerts to residents in high-risk areas as water levels rise.
Development of Chain Link Twister Machine for Land Fencing Applications
7th International Conference on Electronics, Communication and Aerospace Technology (ICECA), 2023, IEEEDesigned an automated chain link twisting machine with adjustable length control for small-scale fencing businesses, improving efficiency and safety in production.
Contact Me
Have a project idea, a question, or just want to say hello? I'd love to hear from you.