Muhammad Zulqarnain

Built a full-stack multi-vendor marketplace from scratch with real-time inventory, payment processing (Stripe), and a seller analytics dashboard. Handles 2,000+ concurrent users with <200ms API response times.

Notion-like collaborative editor with real-time multi-user editing powered by CRDTs. Features include rich text editing, nested blocks, inline comments, and presence indicators. Built a custom operational transform layer.

Data-heavy SaaS dashboard for product analytics with custom chart library, cohort analysis, funnel visualisation, and scheduled PDF report exports. Processes 100M+ events/day via a streaming pipeline.

“Zunain was instrumental in our Core Web Vitals overhaul. He identified and resolved the LCP bottlenecks that had been plaguing our mobile experience for months — the result was a 45% improvement that directly correlated with a measurable uplift in user retention. He writes clean, well-reasoned code and communicates tradeoffs exceptionally well. One of the best engineers we've worked with.”

“We brought Zunain in to build our RAG-based document intelligence platform and he delivered beyond expectations. The pipeline he architected — using LangChain, Pinecone, and the OpenAI API — handles 50,000+ enterprise documents with sub-500ms query latency. He understood our domain quickly and made excellent architectural decisions around chunking strategy and metadata filtering. The system has been running in production for six months without any incidents.”

“Zunain built our analytics dashboard from scratch — a highly data-intensive React + Node.js application processing over 100 million events per day. He designed the ClickHouse schema, built a custom D3 chart library tailored to our UX needs, and shipped the entire thing on time. He's self-directed, thorough in testing, and a fantastic communicator across time zones. We're very much hoping to work with him again.”