srcportfolioSivapunithan.java

Java Developer · Spring Boot · Full-Stack

Sivapunithan S.

I build reliable systems where backend logic, data, and business workflows meet.

Java · Spring Boot · SQL · Next.js · TypeScript

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01INTRODUCTION

coreabout

I care about the invisible parts of software — APIs, data flows, validations, persistence, and the business rules that make products reliable.

I am a backend-focused full-stack developer working with Java, Spring Boot, SQL, Next.js, and TypeScript. I enjoy debugging complex workflows, designing practical APIs, and building maintainable software that solves real operational problems.

02SELECTED WORK

Work that favours reliability over decoration.

01FULL-STACK APPLICATION

Library Management System

A role-based platform with separate administrative and user workflows for managing books, authors, publishers, lending, and returns.

HIGHLIGHTS

Designed and integrated REST API workflows
Implemented role-aware navigation and access handling
Built lending and return flows
Resolved authentication, CORS, and UI-state issues

Java · Spring Boot · MySQL · Next.js · TypeScript

COMPLETED LEARNING PROJECT

02BACKEND APPLICATION

Movie Ticket Booking Application

A backend-focused booking system with concurrent seat reservation, transaction safety via optimistic locking, and rollback handling for simultaneous booking requests.

HIGHLIGHTS

Implemented optimistic locking using JPA @Version fields to prevent double-booking under concurrent requests
Built REST API endpoints for seat selection, booking confirmation, and real-time availability with rollback handling
Designed data models for movies, screens, showtimes, seats, and bookings to support the full booking workflow
Tested multi-threaded booking scenarios to verify concurrency control under simultaneous load
Structured application as a realistic backend-heavy project focused on data integrity and concurrent access

Java · Spring Boot · JPA · MySQL · REST APIs

IN DEVELOPMENT

03ENGINEERING PRACTICE

Java Backend Engineering Lab

A structured repository for learning backend fundamentals beyond basic CRUD applications.

Java · SQL · Git

ONGOING

HIGHLIGHTS

Java concurrency exercises
Networking experiments
Echo-server implementation
SQL practice
Technical notes and observations

04ANONYMISED ENTERPRISE WORK

Procurement Workflow Case Study

A sanitised case study covering workflow debugging, persistence fixes, approval-state handling, calculation corrections, and frontend-backend integration.

Java · Spring Boot · Oracle SQL · ServiceNow · Next.js

ANONYMISED CASE STUDY

Private codebase — details available in conversation

HIGHLIGHTS

Debugged and resolved approval-flow issues across purchase request and GRN workflows
Fixed database-persistence problems including duplicate invoice checks and financial-calculation errors
Identified and corrected role-based task-visibility gaps across requester, approver, and finance stages
Integrated frontend approval dashboards and procurement forms with backend Java and Spring Boot APIs
Worked across Oracle SQL queries, ServiceNow asset records, and Next.js pages in a production-style enterprise codebase

debug.log

03STACK

Tools I work with daily.

01BACKEND

Java
Spring Boot
Spring Security
REST APIs
JPA

02DATA

Oracle SQL
MySQL
Hibernate
SQL Optimisation

03FRONTEND

Next.js
React.js
TypeScript
API Integration

04ENGINEERING PRACTICE

ServiceNow Integration
Concurrency Control
Maven
Debugging

05TOOLS

Git
SVN
Postman
IntelliJ IDEA
VS Code

04EXPERIENCE

Experience

November 2025 — Present

RCS Tech LLP

Java Developer

Working on an enterprise Procurement and Asset Management System using Spring Boot, Oracle SQL, and Next.js. The role covers backend API development, Spring Security integration, ServiceNow asset sync, and production debugging across a Tomcat and SVN-based business application.

Developing and maintaining backend modules for procurement workflows including purchase request handling and a 3-step approval flow covering requester, approver, and finance stages
Designed and built REST APIs for GRN creation, purchase orders, AP processing, and payment-request flows
Implemented Spring Security for role-based access control across procurement and asset management modules
Integrated the Asset Management module with ServiceNow for automated incident creation, asset record sync, and service request handling
Wrote and optimised Oracle SQL queries for procurement reports, asset records, and budget validation
Developed Next.js frontend pages including approval dashboards, procurement forms, and data tables connected to backend APIs
Debugged production backend issues including API failures, data inconsistencies, and SQL query errors

July 2025 — October 2025

RCS Tech LLP

Software Developer Intern

Four-month internship contributing to the same enterprise procurement application under senior developer guidance.

Built REST API endpoints for procurement modules using Spring Boot and Oracle SQL under senior developer guidance
Assisted with Next.js and React.js frontend tasks connecting UI components to backend services
Participated in sprint planning, daily standups, and peer code reviews

05EDUCATION

Education

August 2020 — June 2024

Anna University

B.E. Computer Science and Engineering

Amrita College of Engineering and Technology, Nagercoil

CGPA 8.35 / 10

06CURRENT FOCUS

What I am sharpening right now.

01Java Concurrency
PRACTISING
02System Design Fundamentals
LEARNING
03Database Internals
LEARNING
04Backend Architecture
BUILDING
05Data Structures and Algorithms
PRACTISING

07CONTACT

Let’s build something reliable.

I am open to software-development opportunities involving Java, Spring Boot, Oracle SQL, Next.js, and backend-heavy full-stack work.