Jules Rosser
Mobile Full Stack Engineer at Expensify
San Francisco, California, United States
Summary
🤩
Rockstar🎓
Top SchoolJules Rosser is a Mobile Full Stack Engineer with 11 years of experience building high-quality Android and cross-platform applications, now based in San Francisco and working at Expensify. He blends deep Android expertise (Kotlin, MVVM, RxJava) with React Native and backend skills (TypeScript, PHP, SQL), consistently driving modular architectures, CI/CD pipelines, and test-first practices. Jules has led technical ownership of cross-platform features, architected offline-first and low-latency streaming solutions, and introduced best practices that improved performance and release reliability. He’s equally comfortable shipping product features and mentoring teams, having moved projects from legacy Java to modern Kotlin and modular builds. Outside of production apps he explores creative engineering through VR game development in Unreal, reflecting a strong curiosity for interactive systems and real-time graphics.
11 years of coding experience
9 years of employment as a software developer
Maths, IT, Business Studies, Maths, IT, Business Studies at Exeter CollegeHigh School, High School at West Exe Technology College
English
Stackoverflow
1,295reputation
22kreached
3answers
1question
gradle
top-5%
android-studio
top-5%
android
top-5%
Github Skills (115)
mobile-development10
chat10
collaboration10
app-framework10
android-application10
kotlin-android10
financial10
cross-platform10
persistent10
android10
mobile10
ios10
react-native10
redux10
android-open-source10
Programming languages (10)
Github contributions (5)
Julesssss/BirthdayReminder
Sep 2015 - Apr 2018
Open source Android application which keeps track of and reminds users of their loved ones birthdays. View on the PlayStore here: https://play.google.com/store/apps/details?id=website.julianrosser.birthdays
Contributions:3 releases, 137 commits, 18 PRs in 2 years 7 months
android-open-sourcebirthdaysandroidkotlingoogle-play
infrmr/infrmr
Apr 2015 - May 2015
Contributions:32 commits, 17 PRs, 19 pushes in 21 days
flutternewsnews-appdisplays
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