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Achievement: QuickdrawAchievement: Pull Shark

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asyncsourav/README.md

Sourav Kumar

Backend-Focused Software Developer · Java · Spring Boot

LinkedIn • Codolio • LeetCode • Email

About

B.Tech CSE student (2028) building backend systems around real engineering problems: concurrency, security, caching and real-time updates. I started with Node.js and Express and now work mainly in Java and Spring Boot.

Featured Project: QuickTix

A high-concurrency event-ticketing platform (live).

  • Optimistic locking: 10 simultaneous requests for one seat produce exactly one booking and nine conflicts
  • Redis cache-aside: median read latency 22.1 ms to 5.4 ms (~75%)
  • Bucket4j rate limiting: 99.5% of 1,000 rapid-fire requests blocked, with a circuit breaker that fails open if Redis is down
  • STOMP WebSockets: 1,500/1,500 live seat updates delivered to 50 clients, median 23.8 ms
  • Dual rotating JWT refresh tokens with reuse detection, Docker, GitHub Actions CI, 39 automated tests, k6 load tests

Other Projects

  • EduTech LMS: MERN learning platform with Stripe Checkout, Gemini-powered course search and quiz generation, admin analytics, and role-based access control
  • DevTinder and NASA Mission Control: full-stack projects built while following courses, to learn authentication flows, REST design and React

Tech Stack

  • Languages: Java, JavaScript, SQL, C, C++
  • Backend: Spring Boot, Spring Security, JPA/Hibernate, Node.js, Express.js, WebSockets (STOMP)
  • Data: PostgreSQL, Redis, MongoDB
  • Testing & DevOps: JUnit 5, Mockito, Testcontainers, JaCoCo, k6, Docker, GitHub Actions
  • Security: JWT rotation with reuse detection, bcrypt, Bucket4j, Resilience4j
  • Frontend & Tools: React, Vite, Tailwind CSS, Git, Postman, Render, Vercel

Problem Solving

600+ problems solved, primarily in Java, across LeetCode, GeeksforGeeks, HackerRank, CodeChef and Codeforces. Peak LeetCode contest rating 1686, 13 contests.

View my DSA profile →

Open To

Software Engineering and Backend Engineering internships.

Pinned Loading

  1. quicktix quicktix Public

    Production-grade event ticketing platform, concurrency-safe seat booking (optimistic locking), Redis-cached listings, anti-scalping rate limiting, and live seat availability over WebSockets. Built …

    Java 1

  2. project-management-system project-management-system Public

    This project features an advanced File Management System that allows users to upload, store, and serve files directly from the server with seamless download functionality.

    JavaScript 1

  3. leetcode leetcode Public

    this repo contains all the leetcode questions that I solve. It's a repo to re check my attempted questions and all solved questions at a place with the submission time and date and all the rest det…

    Java 1

  4. edutech-lms-platform edutech-lms-platform Public

    Production-grade Learning Management System built with the MERN stack, featuring secure JWT authentication, role-based access control, Stripe payment integration, AI-powered course search & quiz ge…

    JavaScript 1

  5. dev-tinder dev-tinder Public

    Full-stack developer networking platform with secure authentication, profile management, and stateful connection workflows.

    JavaScript 1

  6. nasa-launch-control nasa-launch-control Public

    Full-stack web application, Built with React, Node.js, Express, and MongoDB. Features real-time launch scheduling, mission tracking, and habitable planet discovery using NASA Kepler exoplanet data.

    JavaScript 1