Case Studies.
Production systems I've owned end to end — the architecture decisions, the war stories, and the trade-offs. Client code stays private; each case study is the full write-up.
Fintech-Relevant
Catalog Ecommerce Platform
Atomic stock transactions, idempotency keys, Razorpay webhooks, money-safe arithmetic, and a reconciled credit ledger.
Next.js · Prisma · Redis · BullMQ
Apnaccountant — Finance SaaS
Subscription billing, invoicing, webhooks, and fiscal-year P&L reporting for SMBs.
Laravel 11 · Razorpay · mPDF
Certifly — Certificate SaaS
Credit-based monetization with atomic transactions, Razorpay reconciliation, and tamper-proof PDF verification.
Next.js · Express · MongoDB · Puppeteer
Scale & Systems
Sangathan Events — QR Attendance
A microservice extraction cut card generation 90% (2s → 0.2s) for 10,000+ attendee events.
PHP · FastAPI · Celery · Redis
The Hiring Company — ATS
Referral-powered ATS with a custom MVC framework, 5-role RBAC, and a 1.9M+ record migration.
PHP (Custom MVC) · MySQL · JWT
Smart Dairy — Logistics
60+ REST APIs, real-time GPS + QR drive execution, and reconciliation over 1,200+ weekly transactions.
Node.js · Express · PostgreSQL
JSG — Community Platform
100+ independent groups on a custom MVC framework with slug-based tenant isolation and a WebP pipeline.
PHP (Custom MVC) · MySQL · JWT
Full-Stack Products
ACPL Construction ERP
Multi-tenant construction ERP with geotagged task verification; 17+ controllers, 50+ endpoints.
Next.js 15 · React 19 · Laravel 11
AI Admission Counselor
FastAPI + RAG over OpenAI: adaptive questionnaires, streaming reports, and a Markdown → PDF pipeline.
FastAPI · RAG · OpenAI · JWT RSA256
Public Proof of Work
Adx Plugin — WordPress
Publicly shipped, security-reviewed ad-management plugin — 10+ ad formats with zero-code configuration.
PHP 7.4+ · WP Plugin API · GPT.js
AI Resume Optimizer
Open-source LLM tool that rewrites resume bullets for a job description while preserving Google Doc formatting.
Python · FastAPI · Google Docs API · Gemini/OpenAI
Let's build something robust.
Backend engineer for scalable APIs, business workflows, and product delivery.