# Mohd. Hussain Ansari

> Back-end engineer with over four years designing and running production systems in Node.js, NestJS and TypeScript. My work sits where correctness matters most: payment and subscription lifecycles, wallet and ledger mechanics, and real-time infrastructure that has to stay consistent across many servers at once.

- **Name:** Mohd. Hussain Ansari
- **Current role:** Software Development Engineer 2 at INK IN CAPS
- **Discipline:** Back-end Engineering
- **Experience:** 4+ years
- **Location:** Mumbai, Maharashtra, India
- **Core stack:** Node.js, NestJS, TypeScript, MongoDB, PostgreSQL, Redis, AWS
- **Email:** mohd.hussainansari19@gmail.com
- **LinkedIn:** https://linkedin.com/in/mohd-hussain-ansari
- **GitHub:** https://github.com/Mohd-Hussain-Ansari
- **Résumé (HTML):** https://hussainansari.dev/resume
- **Résumé (PDF):** https://hussainansari.dev/hussain-ansari-resume.pdf

## Headline numbers

- 3,000+ — Concurrent WS connections (Socket.IO + Redis, multi-server)
- $462K — Processed monthly (Across ~7,700 transactions)
- 30K+ — Users served (Payment-gateway workflows)
- 800+ — Sellers migrated (Zero data loss)
- 2.7M — Records re-indexed (Schema + index optimisation)
- 25% — Query latency cut (Post-migration)
- 75% — Feed load time cut (~90% less data transferred)
- 10 — Engineers led (Back-end and QA)

## Pages

- [Home](https://hussainansari.dev/): profile, selected work, experience, stack, contact
- [Résumé](https://hussainansari.dev/resume): full résumé as a single HTML page
- [Full text for LLMs](https://hussainansari.dev/llms-full.txt): résumé plus every case study in markdown

## Case studies

- [Creator Subscription & Wallet Platform](https://hussainansari.dev/work/subscription-wallet-platform): Real-time messaging, subscription lifecycles, and a multi-provider wallet and ledger, run across a horizontally scaled NestJS monorepo.
- [Multi-Tenant Seller Marketplace](https://hussainansari.dev/work/seller-marketplace): Seller operations, order management, and Shopify synchronisation for a multi-tenant marketplace, rebuilt on NestJS with a migration of 800+ sellers and zero data loss.
- [Events & Booking Platform](https://hussainansari.dev/work/events-booking): Event creation, participant management, and payouts for a bookings platform, with identity verification and real-time admin alerting.
- [ONDC Logistics Network Integration](https://hussainansari.dev/work/ondc-logistics): Protocol-compliant order, fulfillment, and grievance APIs certifying a logistics provider onto India's Open Network for Digital Commerce.
- [Offline-First Rider App](https://hussainansari.dev/work/rider-delivery-app): A React Native delivery app for riders working without reliable connectivity, built on a local SQLite source of truth and a sync engine that routes each shipment by type and outcome.