| Location: Pakistan Willing to relocate: Yes (UK, Europe, US; with sponsorship) Technologies: Python, TypeScript, Go, PostgreSQL, Redis, GCP, FastAPI, Temporal, LangGraph Email: munimzafar100@gmail.com I was the second engineer at an a16z-backed fintech and owned the payment stack for two years. That meant ACH, wire, check, and card rails, a double-entry PostgreSQL ledger, and webhook pipelines designed to stay correct under duplicate delivery and out-of-order events. The platform processed over $150M across 1,800+ customers with zero overdrafts and zero duplicate payment entries. I also ran the migration from Firebase to PostgreSQL, which took ten months and kept every customer live throughout the cutover. The most interesting bug I ever debugged was a race condition in the ACH settlement logic that only appeared when two payments cleared within about 20 milliseconds of each other under specific account nesting conditions. It took three two to reproduce reliably in staging. The actual fix was a single predicate added to a SELECT FOR UPDATE query. After leaving I built a SOC 2 audit agent in LangGraph that covers two financial controls end to end and cut tool calls from 38 to 5 by front-loading deterministic checks before touching the LLM at all. I am currently looking for founding engineer or backend roles. Open to both remote and on-site roles. |