Mohd. Hussain Ansari

Back-end engineering on a creator subscription platform: real-time messaging infrastructure, the subscription and wallet money paths, and the async job layer behind them.

• —Designing real-time WebSocket infrastructure on Socket.IO and Redis Pub/Sub across multiple servers for live messaging and notifications.
• —Managing the end-to-end subscription lifecycle — activation, renewal, expiry, invoicing, retries and failure recovery — with idempotency mechanisms that prevent duplicate charges.
• —Building wallet and ledger functionality for credit, debit and balance tracking with atomic, consistent transactions.
• —Running Redis-backed BullMQ queues so renewals, notifications and invoicing happen outside the request path.
• —Developing signature-validated webhooks and push notification pipelines on AWS EC2, ALB, Route 53, Lambda, SES and S3.
• —Redesigned a slow home-feed endpoint, cutting load time by ~75% and data transfer by up to 90% under typical usage.

Progressed from mobile app developer to product developer — shipping React Native apps before taking ownership of back-end architecture, third-party integrations, code review, mentoring, and production releases across several products.

• —Led back-end development across product engagements, owning architecture, reusable APIs, integrations, reviews, mentoring, production systems and releases.
• —Drove back-end reliability by identifying recurring failure scenarios and strengthening error handling across production applications.
• —Improved deployment through Docker-based automation — deploys following code push and a green test run, with less manual intervention.
• —Led the technical migration of 800+ sellers with zero data loss, and optimised schema and indexing across ~2.7 million records for a 25% query latency improvement.
• —Recognised as Star Performer in both 2024 and 2025.