Abdul-Qudus Rufai, Frontend & Mobile Engineer

Case studies

How each of those products was built, and the engineering problems behind them.

SurgePay

2025Frontend EngineerLive

Multi-currency fintech on mobile, shipped to iOS and Android.

Naira and dollar wallets, virtual cards, stablecoins, savings and stocks in one React Native app. The flows I built moved $1M+ in its first six months.

React Native, Expo, TypeScript, TanStack Query, Zustand, KYC, Notifications, Analytics, Maestro

Read the case study

Oyo State field systems

2024Mobile EngineerInternal

Digital infrastructure for field operations across Oyo State.

Enforcement, revenue and hospital apps for Oyo State, led by OYRTMA, OYO-VIO and MedicFlow, most running on dedicated Android POS terminals. Together they have processed ₦6B+.

OYRTMA

OYO-VIO

MedicFlow

₦6B+

processed across the Oyo State systems, led by OYRTMA, OYO-VIO and MedicFlow

Read the case study

MedicFlow

2026Mobile EngineerInternal

Healthcare workflows running directly on dedicated POS hardware.

Outpatient and inpatient billing for Oyo State hospitals, on the same POS terminals that print the bill and take payment.

React Native, Expo, TypeScript, TanStack Query, Zustand

Read the case study

Hoydoon

2024Mobile EngineerNo longer active

Location-driven real-estate marketplace built for iOS and Android.

Listings, map search and realtime chat with agents across Nigeria and Somalia, in English, Somali and Arabic, on both app stores.

React Native, Expo, TypeScript, Google Maps, TanStack Query

Read the case study

Recap

2026Designer and engineerLive

Developer work memory that unifies activity across engineering tools.

A morning brief, dashboard and generated reports from your activity across GitHub, Figma, Expo, Slack, Jira and ClickUp.

Read the case studyOpen Recap

userecap.rufixduke.ng

Experience

1. May 2025 to Present

   SurgePayFrontend Engineer, fintech

   I built the multi-currency mobile app end to end: virtual card management, payment and remittance flows, and real-time transaction updates, shipped to Google Play and the App Store. The flows I built moved over $1M in transaction volume in the first six months, and SurgePay went on to secure six-figure backing from the Stellar Community Fund.

   React Native, Expo, TypeScript, REST APIs

   Case study

   $1M+volume in six months

2. Aug 2024 to Present

   AFT Solutions LimitedMobile Engineer, government

   I build the field applications behind Oyo State enforcement, revenue and healthcare: OYRTMA, OYO-VIO and the MedicFlow hospital records system, plus E-Haulage, Park n’ Pay, OYO-BMS and OYO-SSS. Most of them run on dedicated Android POS terminals with card payments and receipt printing. Together these systems have processed more than ₦6B in payments.

   React Native, Expo, POS integration, TanStack Query, Zustand

   Case study

   ₦6B+processed

3. May 2024 to Jan 2026

   QuorvixMobile Engineer, real estate

   I built cross-platform apps for client products at a digital product agency. The main one was Hoydoon, a real-estate marketplace connecting people with listings and local agents, with Google Maps powering location-based search and realtime messaging between users and agents.

   React Native, Expo, Google Maps, WebSockets

   Case study

4. 2024 to 2025Contract

   UNIMED and TASFUEDMobile Engineer, education

   I designed and built library management apps for two universities, the University of Medical Sciences, Ondo and Tai Solarin Federal University of Education, and published both to Google Play and the App Store.

   React Native, Expo, iOS, Android

   2universities live

5. Aug 2022 to May 2023

   MySolarBidFrontend Engineer, web platform

   I built the web platform where clients request quotes and connect with verified solar installers, including the quote generation and warranty management features.

   React, Next.js, Tailwind CSS

Full résumé (PDF)

• 

  OYRTMA

  Road traffic enforcement and rider ID cards on POS terminals.

  2025Internal
• 

  OYO-VIO

  Vehicle inspection and enforcement.

  2025Internal
• 

  MedicFlow

  Healthcare workflows running directly on dedicated POS hardware.

  2026Internal
• 

  E-Haulage

  Haulage management for field officers.

  2025Internal
• 

  Park n’ Pay

  Parking payments for vehicles and trucks.

  2025Internal
• 

  OYO-BMS

  Business registration for traders.

  2025Internal
• 

  OYO-SSS

  Waste management and whistleblowing for Oyo State.

  2025Live
• 

  UNIMED Library

  Library app for the University of Medical Sciences, Ondo.

  2025Live

• 1 min read

  Printing images across Android app boundaries on POS hardware

  The POS printer wanted a file path, and the file lived in a sandbox the printing app could not see.

• 1 min read

  Using Expo OTA updates on POS terminals

  I had been rebuilding and reinstalling APKs for every change. The terminals only needed a new JavaScript bundle.

• 2 min read

  When a POS has a camera but no camera app

  launchCameraAsync worked on my phone and failed on every new terminal. The hardware was there; the app to handle the intent was not.