I build the
systems behind
the product.
Full stack developer with 5+ years building secure, scalable web systems across fintech, aviation, healthcare and Web3.
const dev = {
name: "Onoyima Francis",
stack: ["PHP", "Node", "React", "Solidity"],
years: 5,
status: "open to work"
}
End-to-end capability. From database to interface.
Backend Systems
Authentication flows, REST APIs, database architecture and server-side logic. I build the infrastructure that keeps platforms secure and fast.
Frontend Interfaces
Dashboards, responsive layouts and interactive UIs. I translate complex data into interfaces that are clear to use and reliable across devices.
Web3 and Integrations
Smart contracts, DeFi automation and third-party API integrations. From Stripe to Aave to Twilio, I wire systems together reliably.
Systems built. Problems solved.
View All WorkSERA Aviation Safety Platform
Built SSO authentication with Azure AD and AWS Cognito, RESTful API integrations and dynamic dashboards for airlines submitting incident reports across the US.
OpenRemote — Deployment Packaging Fix
Traced a deployment issue where the demo setup extension worked locally but was missing from test deployment images. Updated the Gradle packaging configuration and verified the extension inside the resulting Docker image.
Stocks and Bonds Capital
Full trading platform with account tiers, crypto payment handling and automated price updates.
Flash Loan Arbitrage Bot
Automated Ethereum-based flash loan bot using Aave and Uniswap for cross-DEX arbitrage.
Don't take my word for it. Here's what clients say.
I hired Francis to develop a Python-based GUI for our hospital's laser eye surgery application, and the results were excellent. The project involved complex calculations across multiple units, watts, joules, milliwatts, meters per second, to determine laser geometry and hazard distances, and he approached every detail with precision. He built the full frontend and backend himself, integrating it smoothly into our existing hospital software infrastructure. What stood out most was his willingness to collaborate closely with our medical professionals to ensure the software actually met clinical requirements, not just technical specs. He also ran extensive testing to validate accuracy, which gave us real confidence in the tool before it was used in a medical setting. Highly professional, detail-oriented, and reliable, exactly what you want for software with real clinical stakes.
We hired Francis to build out a booking platform for our resort agency, and the experience exceeded our expectations. He was reliable and communicative from start to finish, meeting every milestone on schedule, something that made planning around the project much easier on our end. He designed a clean, intuitive admin analytics dashboard that let our team track and manage hotel and resort check-ins with ease, and he built polished client portals and profiles so our customers could easily view and book the resorts we had available. His attention to detail and professionalism made him a pleasure to work with, and we'd gladly bring him on for future projects.
Francis did a fantastic job building and maintaining the user interface for our finance and tech news platform. He worked seamlessly with our design and backend teams to deliver an engaging, easy-to-navigate experience for our readers. He built us an intuitive admin dashboard using PHP that made it simple for our team to update content on our own, and he significantly improved our site's loading speed by optimizing images, scripts, and stylesheets. He also integrated real-time financial market data through third-party APIs, keeping our Forex and crypto coverage current for our audience. On top of all that, his SEO improvements helped grow our organic traffic. A skilled, reliable developer who understood exactly what our platform needed.