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Chaitanya, painted in travel colours
Chaitanya, painted portrait
traveller

Long rides, no fixed route. [ favourite road ]

<coder>

Clean, dependable Java, shipped to production.

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BACKEND DEVELOPER

Chaitanya Pawar

Software engineer. Java / Spring Boot, web & APIs, test automation.

Based in

Sambhajinagar, India · 19.88° N, 75.34° E · IST

Right now

Shipping backend features for Zero, a pre-launch EdTech SaaS.

Open to SDE / new-grad roles (2027) · Taking freelance projects

About

I'm Chaitanya, a software engineer finishing my B.Tech in IT at GECCS (Government College of Engineering, Chhatrapati Sambhajinagar), with about two years of shipping real web apps and APIs. I care most about correctness: validating input on the server, handling the failure paths like declined payments and bad data, and tracing bugs to their root cause. I build with GenAI too, from LLM features in products to daily work with AI coding agents. Off the keyboard, I'm usually on a motorcycle.

~2 yrsshipping production code for clients and a startup
200+DSA problems solved on LeetCode (C++)
2027graduating, open to full-time SDE roles

Selected work

Scroll → to browse
Zero student dashboard with streaks, subjects and quick links
Zero · Pre-launch EdTech SaaS · Aug 2026 → now

Zero — EdTech SaaS for schools

  • Timed tests with auto-grading, with deadlines enforced on the server so attempts can't be extended by tampering with the client.
  • Bulk CSV student import with row-level validation and per-row errors; 200 students in one upload.
  • Razorpay subscriptions across activation, renewal and cancellation via webhooks, including failure paths.
Java 21Spring BootRazorpayAWS
Havells Brand Store website built for Shri Venkatesh Pvt Ltd
Client · Hardware retail · Dec 2024 → now

Shri Venkatesh Pvt Ltd — website and admin, from zero

  • Website and admin panel with JWT auth; the owner runs a 200+ product catalogue, reviews and showroom photos himself.
  • Payment gateway with explicit success and failure handling, plus B2B advance bookings by email.
  • Automated UI tests for the site with Selenium.
JWTPaymentsSelenium
detect("two sum")→ regex hit · 0 API callsdetect("my weird graph q")→ LLM fallback · temp 0 · 20 tokens
Personal · GenAI · Live

LeetGPT — an AI tutor for DSA

  • Guides you through problems step by step, with saved chat history and shareable public chats.
  • Two-stage problem detection: 43 regex patterns at zero API cost, then a deterministic LLM fallback.
  • Google OAuth, bcrypt, JWT in HTTP-only cookies, Helmet and rate limiting.
ReactNode.jsMongoDBGroq · Llama 3.3
Live demo ↗Code ↗
FitAI dashboard showing activities and AI-calculated calories
Personal · Microservices

Fitness app microservices platform

  • User, Activity and AI Recommendation services behind Spring Cloud Gateway, with Eureka and a Config Server.
  • Gateway validates Keycloak-issued JWTs and auto-registers users on first login.
  • RabbitMQ activity events feed an AI service that writes recommendations with Google Gemini.
Spring CloudKeycloakRabbitMQGemini
Automotive cinematography portfolio site built for a video editor
Client · Freelance · Live

Portfolio site for a video editor

A showcase and enquiry site for a freelance video editor, with its own frontend and server, deployed on Vercel.

JavaScriptNode.jsVercel
Visit site ↗Code ↗
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What I build

Business websites

Fast, mobile-first sites with an admin panel you update yourself.

From [ price ]

Backends & APIs

Spring Boot or Node APIs: logins, roles, payments, subscriptions and bookings that handle failures properly.

From [ price ]

AI features

LLM-powered features like tutors, assistants and smart search, built to give predictable answers.

From [ price ]
Step 1Free 20-min callWe work out what you need.
Step 2Fixed quoteScope, price and dates in writing.
Step 3Weekly previewsYou see it grow, no surprises.
Step 4Launch + support[ N ] days of fixes included.

Experience

View résuméDownload PDF
Aug 2026 → now
Full Stack / Backend Developer — Zero

Pre-launch B2B EdTech SaaS on Java 21, Spring Boot and AWS. Built server-enforced timed tests with auto-grading, bulk CSV student import with row-level validation, and Razorpay subscription billing via webhooks.

Dec 2024 → now
Freelance Full Stack Developer — Shri Venkatesh Pvt. Ltd.

Built and maintain the company website and admin panel: JWT auth, a 200+ product catalogue, payment gateway, B2B bookings and Selenium UI tests.

Open source
Contributor — Open Food Facts

Traced a broken redirect to a hardcoded return-URL domain and fixed it with dynamic resolution; shipped a feature letting users remove item pictures.

2025 – 2026
Head, Hackslash coding club

Also lead organiser of a national-level Vibe Coding Hackathon (2026).

2023 – 2027
B.Tech, Information Technology

GECCS — Government College of Engineering, Chhatrapati Sambhajinagar.

Languages

Java, JavaScript, C++

Web & API

Spring Boot, Spring Security, REST APIs, Microservices, Node.js, Express, React

Testing & quality

Selenium, Postman, server-side validation, edge cases, root-cause debugging, CI/CD, Agile

GenAI

Gemini and Groq / Llama 3.3 APIs, Claude Code, Google Antigravity, prompt design for deterministic output

Data & cloud

PostgreSQL, MongoDB, Redis, RabbitMQ, AWS, Docker, Git, Keycloak (OAuth2 / JWT)

CS fundamentals

Data structures & algorithms, OOP, DBMS, operating systems, computer networks

Certifications Oracle DevOps Professional · AI Fluency: Framework & Foundations (Anthropic)