Mobile Developer building high-performance iOS & Android apps — from real-time crypto trading systems to P2P communication platforms. Turning complex problems into smooth, scalable mobile experiences.
Not just features — production systems used by millions of real users.
$ whoami > obinna_okoro $ cat skills.txt > react-native, typescript, > redux, reanimated, websockets, > ios, android, jest $ cat location.txt > abuja, nigeria $ echo $STATUS > shipping great mobile apps $ _
I'm Obinna Okoro, a React Native developer based in Abuja, Nigeria. I specialise in building end-to-end mobile applications for iOS and Android — from architecture to App Store.
My work spans real-time trading systems, P2P crypto platforms, and secure fintech applications. I believe the best mobile app isn't the flashiest — it's the one that's fast, reliable, and delights the user every time.
Outside of work, I'm drawn to the intersection of mobile engineering and emerging technology — whether that's prototyping blockchain-powered mobile apps, profiling and optimising performance bottlenecks, or contributing to open-source tools that make developers' lives easier.
A selection of production mobile products and platforms I've shipped.
A peer-to-peer mobile communication platform with a user registry system for scalable discovery, multi-device account sync, and a rebuilt interactive chat keyboard. Built for iOS and Android with native modules.
Real-time trading mobile app for a global crypto exchange — live order books, TradingView candlestick charts, advanced order types, margin trading, and OTC/P2P markets. WebSocket-driven with sub-second updates.
Integrated blockchain wallet supporting deposits, withdrawals, and transaction monitoring across multiple digital assets. Included KYC/AML flows, MFA, and secure account management features.
Built a B2B fintech web application from scratch. Implemented secure cookie-based authentication using Redis, integrated fintech APIs, and designed full transaction workflow systems for business clients.
Led technical strategy and mobile development for Sapa, a Nigerian personal finance app helping users take charge of their money. Architected the React Native codebase, oversaw spending tracking, budgeting tools, and financial insights features built for the Nigerian market.
The tools and technologies I use to build production mobile experiences.
From government platforms to global crypto exchanges — shipping real products at every stage.
Leading mobile feature development for Holepunch, a P2P communication product. Built a user registry system for scalable discovery, improved multi-device account sync, developed native iOS/Android modules, and rebuilt the interactive chat keyboard. Shipped file/media workflows including upload, download, and preview for chat experiences.
Delivered mobile features for a global cryptocurrency exchange supporting spot, margin, derivatives, and P2P markets. Implemented real-time trading interfaces with live order books, TradingView candlestick charts, and WebSocket market data. Integrated multi-asset crypto wallets and contributed to OTC/P2P modules with escrow and settlement logic. Worked on KYC/AML compliance and MFA security flows.
Built a B2B fintech web application from scratch. Implemented secure cookie-based authentication using Redis and integrated fintech APIs supporting transaction workflows for business clients.
Led the end-to-end technical vision and execution for Sapa, a personal finance mobile app helping Nigerians take control of their spending. Architected the React Native mobile codebase, built expense tracking and budgeting features, and oversaw the engineering team. Defined the product roadmap and drove delivery of core financial tools tailored to the Nigerian market.
Designed and supported an Internal Generated Revenue (IGR) platform for government workflows. Built a document archiving platform for the Budget Office of the Federation, a web app for the Federal Ministry of Industry and Trade (FMITI), and supported a school management system with CBT modules.
Have a project in mind? I'm always open to discussing new opportunities.
location: "Abuja, Nigeria"
role: "Mobile Developer (React Native)"
experience: "7+ years"
platforms: ["iOS", "Android"]
status: "open to opportunities"