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@haroldausten-okoronk
Award-winning Senior Android Engineer focused on accessible, user-centric mobile experiences.
I am an award-winning Senior Android Engineer with extensive experience building B2C mobile applications and championing mobile accessibility. I have led and shipped large-scale apps like TfL Go and contributed to enterprise monitoring solutions such as ThousandEyes' Mobile Endpoint Agent.
My work emphasizes modern Android architecture, performance optimization and offline-first designs — from reducing app size and load times to integrating features like Google Wallet and scalable pagination. I mentor engineers, drive refactors to current Android tech, and consistently deliver measurable improvements in user experience and engagement.
I thrive in collaborative environments that value clean architecture, testing and accessibility, and I bring deep hands-on expertise across Kotlin, Jetpack Compose, MVVM/MVP, dependency injection and instrumentation testing to help teams ship high-quality products.
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Work history, roles, and key accomplishments
Led development and refactor of the Mobile Endpoint Agent (MEPA), merging two major network-testing apps and updating the codebase to modern Android technologies to improve reliability and maintainability.
Transport for London
May 2023 - Oct 2024 (1 year 5 months)
Led development on TfL Go, shipping Route Service Diagrams and bus service features to 1M+ monthly Android users using an offline-first MVVM architecture.
Deliveroo
Jan 2022 - Apr 2023 (1 year 3 months)
Built a customer reviews page with a rating graph, added favourites and quick re-ordering, and implemented paginated order history to improve UX and retention.
Developed an online train-stop search reducing app size ~20% and improving load performance ~60%; integrated Google Wallet to enable ticket saving for Android users.
Ground Control
Oct 2016 - Aug 2018 (1 year 10 months)
Re‑vamped the flagship Android app with MVVM and clean architecture, reducing load times up to 80% on low-end devices and delivered an iOS counterpart in Swift.
Degrees, certifications, and relevant coursework
Master of Science, Computer Science
2012 - 2016
Completed a Master of Science in Computer Science, focusing on advanced computing topics and software development practices.
International Baccalaureate, International Baccalaureate
2010 - 2012
Completed the International Baccalaureate program with a broad pre-university curriculum.
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