Sujit Bhalekar

Get To Know More

About Me

Experience

3 years
Java Backend Engineer
Tata Consultancy Services

Education

Bachelor of Technology(I.T)
Government College of Engineering, Aurangabad

I've always been more interested in understanding how things work than simply using them. My interest in physics and mathematics shaped that mindset early on, teaching me to reason through problems by understanding the logic behind them rather than searching for quick answers. That same curiosity naturally led me toward backend engineering, where understanding how systems behave beneath the surface has always interested me more than simply interacting with the interfaces built on top of them.

Today, I primarily build backend applications using Java and Spring Boot, applying that same mindset to designing reliable software that is clean, maintainable, and built to evolve over time. I enjoy reasoning through system behavior, understanding application architecture, and solving problems by first understanding why they exist. More recently, I've been exploring modern AI technologies alongside backend development, viewing them not as a replacement for engineering fundamentals, but as another opportunity to build smarter software while continuing to learn and grow as an engineer.

Explore My

Experience

Business Context

Part of a backend engineering team building and maintaining Java / Spring Boot microservices for a banking and digital-payments platform, covering core workflows such as customer onboarding, wallet management, payments, and transaction processing.

Key Responsibilities

Designed, developed, and maintained Spring Boot microservices and RESTful APIs using Java 8+, Spring MVC, and SQL for enterprise Digital Wallet and Banking applications, supporting business-critical workflows.
Designed and implemented RESTful APIs for wallet management, customer onboarding, transaction processing, balance validation, and audit logging, integrating RabbitMQ for asynchronous event-driven communication across distributed microservices.
Implemented business logic using Spring Boot, Spring Data JPA, and Hibernate, while developing reusable DTOs, centralized exception handling, and maintainable backend services that reduced duplicate code by approximately 30%.
Built secure and high-performance backend services by implementing Spring Security, JWT, and OAuth2, while optimizing SQL queries and database interactions through query tuning and indexing, improving query execution performance by approximately 30%.
Collaborated with cross-functional teams and DevOps engineers during Agile releases, supporting OpenShift deployment validation, production issue resolution, and enterprise application support using JUnit, Postman, Splunk, and Grafana, reducing production issue resolution time by approximately 25%.
Contributed to full-stack feature development by building and enhancing Angular dashboards and reusable UI components using TypeScript and JavaScript, while integrating AI-assisted development workflows with GitHub Copilot and Claude for code generation, debugging, refactoring, documentation, and solution exploration, improving engineering productivity and accelerating feature delivery.

Engineering Focus

Backend Development REST API Development Microservices Secure Application Development Production Support Debugging & Root Cause Analysis

Technologies Used

Java Spring Boot Spring Security Spring Data JPA Hibernate REST APIs Microservices SQL RabbitMQ Angular TypeScript Git OpenShift JUnit Postman Splunk Grafana GitHub Copilot Claude

Checkout my recent

Achievements

AWS Certified Cloud Practitioner

Issued Jun 2024 - Expires October 2027

About Certification: Earners of this certification have a fundamental understanding of IT services and their uses in the AWS Cloud. They demonstrated cloud fluency and foundational AWS knowledge. Badge owners are able to identify essential AWS services necessary to set up AWS-focused projects.

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AWS Certified AI Practitioner

Issued April 2026 - Expires April 2029

About Certification: Earners of this certification have a foundational understanding of AI and ML concepts and their applications on the AWS Cloud. They demonstrate knowledge of core AWS AI/ML services and can identify the right services to build and integrate intelligent solutions.

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AWS Certified Solutions Architect

Issued October 2024 - Expires October 2027

About Certification: Earners of this certification have a strong understanding of designing and deploying scalable, secure, and cost-effective solutions on the AWS Cloud. They demonstrate knowledge of core AWS services, architecture best practices, and can design reliable cloud-based systems.

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Browse My Recent Innovative

Projects

AI Powered

AI Powered Spring Boot Angular PostgreSQL JWT Gemini AI

Github About

Overview

QueryPilot is an AI-powered Natural Language to SQL platform that enables users to generate, validate, execute, and manage SQL queries using plain English. Built with Spring Boot, Angular, PostgreSQL, JWT Authentication, and Google Gemini, the application combines secure backend engineering with modern AI capabilities to simplify database querying while providing query history, saved queries, and export functionality.

Tech Stack

Backend

Java 21 Spring Boot Spring Data JPA Hibernate REST APIs

Security

Spring Security JWT

Frontend

Angular 19 Angular Material

Database

PostgreSQL

Google Gemini API

Build

Maven

User

Angular 19 Frontend

REST APIs

Spring Boot BackendSpring Security + JWT

Google Gemini APINatural Language → SQL

SQL Validation

PostgreSQL

Query Results

CSV / Excel Export

Architecture Highlights

Angular 19 frontend communicates with the Spring Boot backend through REST APIs.
Spring Security and JWT Authentication protect all secured endpoints.
Google Gemini converts natural language into executable SQL.
Generated SQL is validated before execution against PostgreSQL.
Safe read-only SQL execution prevents unintended database modifications.
Query history and saved queries improve usability and productivity.
Results can be exported to CSV and Excel for reporting.

Full-Stack

React.js Node.js MongoDB Stripe

Github About

Overview

TomperWear is a full-stack e-commerce storefront for clothing essentials, providing product browsing, cart management, Stripe-powered checkout, and JWT-based authentication across a React front end and a Node.js/Express/MongoDB backend.

Tech Stack

Frontend

React.js Firebase Stripe Formspree

Backend

Node.js Express.js MongoDB JWT

Architecture

React client talking to an Express/MongoDB API, with Stripe handling the payment flow.

My Contributions

Designed and built the storefront, cart and checkout flow independently.

Engineering Challenges

Keeping cart state consistent across a multi-step checkout.

Engineering Insights

Learned how much checkout UX depends on predictable state management.

Full-Stack

Angular Spring Boot PostgreSQL JWT Gemini AI GameEngineAdapter

Github About

Overview

Designed and built an extensible AI-powered gaming platform using Angular and Spring Boot, integrating independently isolated Mario, Pac-Man, and Snake game engines through a reusable GameEngineAdapter. Implemented authenticated game sessions, event-driven game lifecycle handling, a shared game catalog, a Game Details experience, and Gemini-powered AI Coach capabilities.

Tech Stack

Frontend

Angular TypeScript HTML CSS

Backend

Java Spring Boot Spring Security JWT REST APIs

Database

PostgreSQL

Game Engine

JavaScript Canvas GameEngineAdapter

Google Gemini AI Coach

Testing

Karma Node.js Test Runner

User / Browser

Angular Game Platform

GameEngineAdapterMario · Pac-Man · Snake

Mario Game EngineIsolated iframe

Game Loop Physics & Collision Input Handling Rendering Game State

Spring Boot Backend

PostgreSQL

Gemini AI CoachExternal AI integration

Lifecycle events (GAME_OVER / GAME_COMPLETED) flow from the Mario engine through GameEngineAdapter → Angular → Spring Boot for game-session persistence.

Architecture Highlights

Isolated Mario game engine running inside an iframe
GameEngineAdapter as the integration boundary
Event-driven game lifecycle communication
Angular platform for gameplay orchestration
Spring Boot + PostgreSQL for authenticated game sessions
Gemini-powered AI Coach integration

Engineering Challenges

Keeping the Angular GamePlay flow and lifecycle handling generic while supporting per-game event names (e.g. pacman:game-over, snake:game-over) without breaking Mario's existing behavior during the multi-game expansion.

Front-End

HTML CSS Vanilla JavaScript

Github

Overview

A single-page portfolio built without a framework, iterated on across several milestones.

Tech Stack

Built With

HTML CSS Vanilla JavaScript

Architecture

Static HTML/CSS with small, self-contained JavaScript modules for interaction and animation, including a reusable accordion-style expand/collapse component and a responsive, CSS custom-property-driven dark theme.

About Me

Experience

Education

Experience

Tata Consultancy Services (TCS)

Business Context

Key Responsibilities

Engineering Focus

Technologies Used

Technical Skills

Languages

Java

C++

SQL

JavaScript

Backend

Spring Boot

Spring MVC

Spring Data JPA

Hibernate

Architecture & APIs

REST APIs

Microservices

Spring Security

Node.js

Express.js

Frontend

Angular

TypeScript

HTML5

CSS3

Databases

PostgreSQL

MySQL

Messaging

RabbitMQ

DevOps

Git

Maven

Docker

OpenShift

Testing & Monitoring

JUnit

Postman

Splunk

Grafana

AI-Assisted Development

GitHub Copilot

Claude

Prompt Engineering

Achievements

AWS Certified Cloud Practitioner

AWS Certified AI Practitioner

AWS Certified Solutions Architect

Projects

QueryPilot

E-commerce web-application for selling clothing essentials

AI-Powered Gaming Platform

My Portfolio Website Project

Contact Me