Senior Backend Engineer · Founder of Replayfy
I have spent 8 years building and operating backend and distributed systems in production. Remote from Nigeria (UTC+1).
Resume (PDF) · LinkedIn · iamnasirudeen@gmail.com
Live in production with real customers. I built it and run it solo, and released it open core.
- Queue-based ingestion on Redis Streams and BullMQ into PostgreSQL, ClickHouse and MongoDB, carrying millions of sessions in production.
- AI usage metering that fails closed: failed ledger writes spill to Redis, reconcile atomically, and a circuit breaker blocks AI calls when usage cannot be recorded. Ledger code
- An LLM agent that investigates sessions through typed, role-filtered tools and asks for explicit confirmation before any write.
- Five production SDKs: web, iOS, Android (Maven Central), React Native and Flutter.
A production face-verification service for identity verification and deepfake prevention, built with Python, FastAPI, InsightFace and Celery for async image processing.
github.com/Onboardbase/securelog-scan
An open-source secret-detection CLI and SDK that runs inside CI/CD pipelines, built on Aho-Corasick multi-pattern matching with a plugin system for custom rules.
- Techinnover: I lead backend infrastructure for 180,000+ daily active users.
- DevCraft: I cut critical queries from 22 seconds to sub-second and built a real-time messaging pipeline that cut delivery latency by 70%.
- Okra: I built event-driven open-banking services that put every bank in Nigeria behind one API, and was on call for the services behind DLocal, Google Nigeria and inDrive.
- Onboardbase: I led a monolith-to-microservices migration that cut response times by 65%.