Available for opportunities

Hariharan
P.

Java Full Stack Developer & API Architect

Building scalable, production-grade web applications with Spring Boot & React. Reduced API response times by ~20% and improved SLA compliance by 25% — I ship systems that perform.

↗ Hire Me ⬇ Download Resume
1+
Years Experience
10+
REST APIs Built
~20%
API Speed Boost
25%
SLA Improvement
About Me
The Developer
Behind the Code

I'm a Java Full Stack Developer based in Chennai, India, specializing in designing production-grade REST APIs and scalable web systems using Spring Boot, React, and PostgreSQL.

At Approtech R&D Solutions, I engineered JWT-secured endpoints, containerized deployments with Docker, and drove measurable performance improvements — cutting API response time by ~20% through smart query optimization and pagination.

Before this, I spent 2.5 years at RR Donnelley in a cross-functional Agile environment, debugging production systems, triaging 100+ tickets per sprint, and improving SLA compliance by 25%. That experience made me a meticulous, reliability-first engineer.

⚡
Performance-obsessed — I optimize before it breaks
🔐
Security-first API design with JWT & Spring Security
📦
Clean, containerized, deployment-ready code
🤝
Agile team player — thrives in sprint environments
Jun 2025 — Present
Java Full Stack Developer
Approtech R&D Solutions Pvt. Ltd.
Building REST APIs, implementing Spring Security + JWT, Docker containerization, React frontend integration.
Jun 2022 — Dec 2024
CSA – Technical & Frontend Support
RR Donnelley
Resolved API failures, optimized React UI, managed 100+ tickets/sprint, improved SLA by 25%.
Nov 2021 — May 2022
Document Specialist
Adecco
Automated document processing workflows, improving operational efficiency by 15%.
2021 — 2023
MCA — University of Madras
Master of Computer Applications
Advanced studies in software engineering, algorithms, and full stack development.
Technical Skills
My Tech Arsenal

A well-rounded stack built for production — from REST APIs to React UIs, from Docker containers to cloud deployments.

⚙️
Backend & APIs
Java Spring Boot Spring Security Hibernate JPA JWT Auth REST APIs MVC
🎨
Frontend
React JavaScript HTML5 CSS3 Bootstrap Axios Fetch API
🗄️
Databases
MySQL PostgreSQL JPA Queries N+1 Optimization Indexing Pagination
🚀
DevOps & Cloud
Docker AWS EC2 AWS S3 GitHub Actions CI/CD Maven
🧪
Testing & Tools
JUnit 5 Mockito Postman Git GitHub IntelliJ VS Code
💡
Concepts & Methodology
Microservices Agile/Scrum Exception Handling RBAC API Design Root Cause Analysis
Portfolio
Projects That
Ship to Production

Real-world systems built with measurable impact — not just CRUD apps. Each project solves a domain-specific problem at scale.

01
🏥
Full Stack Platform
HealthConnect
Online Health Consultation Platform with doctor recommendations, appointment scheduling, and consultation tracking. JWT-secured endpoints with React frontend via Axios for dynamic real-time rendering.
8+
REST APIs
~25%
Perf Boost
JWT
Secured
Spring BootReactPostgreSQLJWTAxios
⬡ GitHub ↗ Live Demo
02
💸
AI-Powered System
AI Expense Analyzer
PDF/text extraction pipeline using Spring Boot to parse financial documents with 90%+ field accuracy. AI-driven spending pattern analysis with MySQL for historical trend tracking and reporting.
90%+
Accuracy
AI
Integrated
PDF
Extraction
Spring BootMySQLAI IntegrationPDF ProcessingJS
⬡ GitHub ↗ Live Demo
03
📐
Utility Web App
Unit Conversion Portal
Multi-category unit conversion tool (length, weight, temperature, volume) with Spring Boot REST backend. Advanced CSS techniques — 3D transforms, animations, dark mode toggle, gradient layouts.
4+
Categories
3D
CSS FX
Dark
Mode
JavaSpring BootHTML/CSSJavaScriptREST API
⬡ GitHub ↗ Live Demo
Work History
Experience

A track record of delivering measurable impact across development, support, and automation roles.

Jun 2025 – Present
Full-time
Approtech R&D Solutions Pvt. Ltd.
Java Full Stack Developer
  • Designed and implemented 10+ REST APIs using Spring Boot and JPA/Hibernate, reducing manual integration effort by ~30%
  • Engineered RBAC using Spring Security and JWT, securing all API endpoints across user roles
  • Reduced API response time by ~20% via pagination, indexed queries, and N+1 elimination
  • Containerized application using Docker, standardizing environments and eliminating staging bugs
  • Wrote JUnit 5 and Mockito unit tests for Service layer, mocking Repository dependencies
Spring BootJWTReactDockerJUnit
Jun 2022 – Dec 2024
Full-time · 2.5 yrs
RR Donnelley
CSA – Technical & Frontend Support
  • Diagnosed and resolved REST API failures, frontend defects, and deployment issues; reduced resolution time by 30%
  • Improved SLA compliance by 25% by triaging 100+ tickets per sprint in Agile environment
  • Optimized React-based UI components, reducing user-reported UI issues by 15%
ReactAPI DebuggingAgileRoot Cause Analysis
Nov 2021 – May 2022
Full-time
Adecco
Document Specialist
  • Automated repetitive document processing workflows using scripting tools
  • Improved team operational efficiency by 15%
AutomationScripting
Credentials
Certifications
☕
Java Full Stack Development
Code99 IT Academy
2025
✓ Verified
🌐
Web Development
Udemy
2024
✓ Verified
🎓
MCA — Master of Computer Applications
University of Madras
2023
✓ Degree
📚
BCA — Bachelor of Computer Applications
University of Madras
2021
✓ Degree
Milestones
Achievements
🚀
10+
REST APIs Built & Deployed
⚡
~20%
API Response Time Reduced
📈
25%
SLA Compliance Improved
🔐
100%
API Endpoints Secured with JWT
🐛
30%
Ticket Resolution Time Reduced
🎯
90%+
PDF Extraction Field Accuracy
🐳
Docker
Production Containerization
🏗️
3+
Full Stack Apps Built End-to-End
Get In Touch
Let's Build
Something Together
Available for new opportunities
✉
Email
hariharanp2026@gmail.com
in
LinkedIn
linkedin.com/in/hariharanp1001
⬡
GitHub
github.com/Hari10012001
📱
WhatsApp
+91 63690 03319
📍
Location
Chennai, Tamil Nadu, India