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  • Mumbai, India
  • 02:06 (UTC +05:30)

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shreyasnandurkar/README.md

Shreyas Nandurkar — Backend Engineer

       

About

Final-year Computer Science student at Manipal Institute of Technology, Bengaluru, focused on backend engineering with Java and Spring Boot. I build production systems end to end — a live URL-shortener product, an OpenAI-compatible LLM gateway, and a real-time image-streaming application — with an emphasis on clean architecture, concurrency, and performance. Co-founder and founding engineer at GoLinkGone.

Featured Projects

 🔗  GoLinkGone  ·  live URL shortener & link-management platform

Co-founder and backend engineer. Short links, click analytics, and customizable QR codes, serving real users. 10K+ pageviews · 500+ short links · 200+ signups. Ranked #9 of 100+ products on Peerlist (Week 26); also launched on Product Hunt.

  • Customizable QR codes — branded QR generation driven by a validated JSONB style configuration, persisted in custom storage and re-rendered on demand.
  • Analytics pipeline — a 10K-capacity click queue drained every 3 seconds via map/reduce into batched upserts, with murmur3-hashed visitor IDs on a virtual-thread executor.
  • Platform — Caffeine caching, ES256 JWT auth, Bucket4j rate limiting, MaxMind GeoLite2 geolocation, host-based dual-domain routing, Supabase auth with Google SSO.

 

 ♟️  BotvinnikAPI  ·  OpenAI-compatible LLM gateway

A single endpoint that routes, load-balances, and fails over across multiple LLM providers (Ollama, Gemini) while presenting the OpenAI wire protocol to clients, so standard SDKs and tools work unmodified.

  • Reactive core — Spring WebFlux with R2DBC; SSE streaming with cross-provider chunk normalization.
  • Routing & resilience — power-of-two-choices load balancing on live in-flight depth, TTFT-based provider health states, circuit breakers with connect-time failover.
  • Security — SHA-256 gateway keys, AES-GCM-256 provider credentials, connect-time SSRF guard, per-key rate limits and spend caps.
  • Verified — ~0.3 ms p50 gateway overhead, zero errors at 200 concurrent, 93 tests including failure injection.

 🎇  Pixel Mosaic  ·  real-time image reconstruction in the browser

Rebuilds the subject of one image using the pixels of another, streamed to a WebGL client and played back as an animated particle system.

  • AI subject extraction — U²-Net saliency model served via ONNX Runtime.
  • Streaming — custom binary WebSocket protocol (32-byte header + 256 KB chunks) feeding a Three.js instanced-points renderer with custom shaders.
  • Concurrency — dual-lane processing pipeline with buffer pooling, a global concurrency semaphore, and per-IP rate limiting.

 

Tech Stack

Languages

Backend

Data

Infrastructure & Tools

Competitive Programming

Codeforces Expert · LeetCode Guardian (2142) · active on CodeChef and AtCoder.

  • 1st place — MAHE CodeWars 2026  (3rd place, 2025)
  • Top 5 Finalist — Hitachi Visisonics AI'26
  • Preparing for ICPC regionals

       

GitHub Stats

Popular repositories Loading

  1. pixel-mosaic pixel-mosaic Public

    Reconstruct any image using only the pixels of another - streamed to your browser as a live WebGL particle storm.

    Java 8 1

  2. botvinnik-api botvinnik-api Public

    A JVM-native LLM gateway - your clients speak OpenAI, your providers don't have to.

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  3. submit50 submit50 Public

    Forked from cs50/submit50

    This is submit50, CS50's command-line tool for submitting problems.

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  4. Smart-Recruitment-Platform Smart-Recruitment-Platform Public

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  5. Ticketing-System Ticketing-System Public

    A Spring Boot–based backend for a ticketing system supporting user authentication (JWT), role-based authorization (Admin, Support Agent, User), ticket lifecycle management, comments with access con…

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