Available for opportunities

Jehonadab
Okpukoro

// Senior Mobile Engineer

7+ years architecting and scaling mobile apps for Android & iOS. I've helped products grow from thousands to 1M+ active users, backed $40M in funding milestones, and led teams to world-class delivery standards.

View My Work Get in Touch
7+
Years Experience
1M+
App Users
$400M
Quarterly Volume
20+
Countries Launched
Jehonadab Okpukoro

// 01. about

A little about me

I'm a Senior Mobile Engineer with over 7 years of hands-on experience building production-grade mobile applications for Android and iOS platforms.

My journey spans from crafting pixel-perfect UIs to architecting robust payment infrastructure. I specialize in Flutter (Dart), React Native, Kotlin, and Swift — bringing products to life from ideation to production at scale.

I've led engineering teams, championed CI/CD culture, set up monitoring pipelines, and collaborated cross-functionally with Product, Design, and QA to ship features that users love.

When I'm not pushing code, I'm thinking about system design, developer tooling, and how to make the next app 10× better than the last.

Architecture
MVVM, MVC, Clean Architecture for scalable, maintainable codebases
Shipping Fast
CI/CD with GitHub Actions & Firebase App Distribution
Leadership
Mentored 8-person teams, improved delivery speed by 30%
Observability
Crashlytics, Sentry, Datadog for real-time monitoring

// 02. experience

Where I've worked

Lead Mobile Engineer
Yellow Card Financials · Remote
Aug 2020 — Oct 2025
  • Architected and shipped the Yellow Card mobile app for Android and iOS, from ideation to launch in 20+ African countries
  • Scaled app performance contributing to user growth from <80K to over 1 million active customers
  • Enabled funding milestones from $1M seed to $40M Series B through high code reliability and quality releases
  • Designed and built on- and off-ramp payment infrastructure processing $400M+ in quarterly volume, powering 14+ cryptocurrencies
  • Mentored and led a mobile engineering team of 8 engineers, improving delivery speed by 30%
  • Implemented mobile CI/CD pipeline using GitHub Actions and Firebase App Distribution, reducing release time from hours to minutes
  • Set up error reporting and monitoring with Firebase Crashlytics, Sentry, and Datadog
Flutter Dart Android iOS CI/CD Firebase Sentry Datadog
Mobile Engineer
Timz.io · Berlin, Germany (Remote)
Dec 2019 — May 2020
  • Designed and implemented architecture for a cross-platform async video conferencing app
  • Built a media processing pipeline for real-time video cropping, compression, and thumbnail generation — reducing load times by 40%
  • Implemented deep-link navigation, improving user engagement and retention
  • Collaborated closely with QA to ensure seamless and reliable releases
React Native Video Processing Deep Links Cross-platform
Mobile Engineer
Andela · Lagos, Nigeria (Remote)
Aug 2018 — Mar 2020
  • Co-developed a meeting room scheduling tool integrated with Google Calendar API, saving thousands in SaaS monthly spend
  • Provided technical leadership and mentorship to new developers, designing level-up projects that accelerated onboarding
  • Championed best coding practices and architectural consistency across mobile projects
Kotlin Swift Google APIs Mentorship
Front-end Developer
Univelcity · Lagos, Nigeria (Remote)
Mar 2017 — Jun 2018
  • Translated complex UI/UX mockups into fully functional front-end solutions, improving learner engagement
  • Collaborated with backend and design teams to ensure seamless data integration and optimal user experience
HTML/CSS JavaScript UI/UX EdTech

// 03. skills

My tech stack

Mobile Frameworks
Flutter Dart React Native Kotlin Swift Java
Architecture & Patterns
MVVM MVC Clean Arch OOP REST APIs GraphQL
DevOps & Tools
GitHub Actions Firebase Fastlane AWS CI/CD
Monitoring & Analytics
Crashlytics Sentry Datadog Firebase Analytics
Collaboration
Agile Scrum Mentorship Code Review Cross-functional Product Ownership
Education
B.A. Computer Science University of London

// 04. projects

Notable work

Yellow Card — Crypto Exchange App
↑ 80K → 1M+ active users
Led the full mobile development lifecycle of Africa's largest crypto exchange, launching across 20+ countries. Built on- and off-ramp infrastructure processing $400M+ in quarterly volume for 14+ cryptocurrencies.
Flutter Android iOS Fintech Crypto
Timz.io — Async Video Collaboration
↓ 40% video load time reduction
Architected a cross-platform async video conferencing app enabling remote team collaboration. Built a media processing pipeline for real-time video cropping, compression, and thumbnail generation.
React Native Video Processing Cross-platform
Room Scheduler — Andela Internal Tool
💰 Saved thousands in monthly SaaS costs
Co-developed an internal meeting room scheduling tool integrated with Google Calendar API, replacing costly third-party SaaS solutions and improving team coordination.
Kotlin Google Calendar API Internal Tools
Mobile CI/CD Pipeline
⏱ Hours → Minutes release cycle
Designed and implemented automated deployment pipelines using GitHub Actions and Firebase App Distribution, dramatically reducing release time and enabling continuous delivery for Android and iOS apps.
GitHub Actions Firebase CI/CD DevOps

// 05. contact

Let's work together

I'm open to exciting mobile engineering roles, technical leadership positions, and consulting engagements. Whether it's a startup scaling fast or an enterprise mobile rehaul — let's talk.

jehonadab.dev@gmail.com
LinkedIn GitHub Email Me