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Unknownmaster0/README.md

Hi, I'm Sagar Singh πŸ‘‹

Software developer who builds real products end-to-end β€” from Next.js frontends to Fastify & Spring Boot backends β€” and then keeps going: hardening, auditing, and refactoring them until they'd survive production.

I care less about shipping demos and more about what happens after: latency budgets, rate limits, privacy flows, and documented design decisions.


πŸš€ Things I've Built

Linkly β€” URL shortener with click analytics

Built for the read-heavy path: sub-10ms redirects through a 3-tier cache-aside lookup (in-process LRU β†’ Valkey β†’ PostgreSQL), separate API and redirect servers so the hot path scales independently, and async click-analytics via BullMQ so tracking never blocks a redirect. Fastify Β· TypeScript Β· PostgreSQL Β· Valkey Β· BullMQ Β· Prisma

Fancy Sticker β€” sticker e-commerce platform

Full-stack store with product catalog, cart, and online payments β€” clean API separation between a React frontend and a Spring Boot backend. React Β· TypeScript Β· Spring Boot Β· MySQL

A focused tool for collecting structured user feedback β€” JWT auth, Zod-validated APIs, API-first design with clear separation of concerns. Next.js Β· TypeScript Β· MongoDB


πŸ”¨ Currently Building

My own cross-device document vault β€” dump files and links from any of my four devices and retrieve them by search instantly. I used to funnel documents through WhatsApp; now I'm building the tool that replaces it, free-forever on Cloudflare R2, Neon, and Firebase. Next.js Β· Tailwind Β· Cloudflare R2 Β· Neon Postgres Β· Firebase


🧠 How I Build

  • I refactor learning projects into production-grade systems β€” Linkly started as a URL shortener tutorial idea; now it has latency targets, security audits, and documented decisions.
  • Security and privacy are habits, not afterthoughts β€” I run attacker-simulation passes on my own code and fix what I find.
  • Design decisions get written down before code β€” every "why" lives in docs, not in my head.

πŸ›  Tech I Work With

TypeScript JavaScript Java
Node.js Next.js React Spring Boot Fastify
PostgreSQL MongoDB MySQL Valkey/Redis
Docker AWS Prisma Git

Pinned Loading

  1. feedback-flow feedback-flow Public

    Feedback-flow

    TypeScript

  2. paytm-like paytm-like Public

    Forked from 100xdevs-cohort-2/paytm

    Simple fronted and backend of Paytm like website

    JavaScript

  3. Explore-it-blog Explore-it-blog Public

    JavaScript

  4. Alumni-portal Alumni-portal Public

    JavaScript

  5. fancy-sticker fancy-sticker Public

    sticker e-commerce website, user can buy sticker and make payment through online payment

    TypeScript