David Onwionoko

I’m a software engineer with 2+ years of experience delivering full-stack, mobile, and data engineering solutions across startup and enterprise environments. I specialize in cross-platform mobile development with Flutter/Dart and full-stack web systems using React and Node.js, with a proven track record of building production-grade applications from requirements to deployment. I’ve also architected a real-time IoT dashboard processing live sensor data and engineered a Python ETL pipeline migrating 10,000+ patient records with zero data loss.

In my current Full-stack Developer contract, I engineered a cross-platform Flutter/Dart mobile app with 100% code reuse across iOS and Android, then built a production-ready interactive 3D viewer for GLTF/GLB models with real-time rendering and multi-gesture controls. I integrated Appwrite BaaS for authentication and cloud storage, resolved native iOS/Android configuration conflicts for hardware-accelerated 3D performance, and translated product requirements into modular technical specifications to reduce rework. Earlier, as a Data Engineer Intern and Data Analyst Intern, I optimized MySQL queries and built Splunk dashboards, searches, and alerts to centralize real-time monitoring and reduce manual reporting overhead.