Colin Marsch
Android Engineer - L6 at Cash App
Seattle, Washington, United States
Summary
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Rockstar🎓
Top SchoolColin Marsch is an Android engineer with a decade of experience building consumer-facing mobile features at Cash App, where he progressed from intern to L6 engineer driving Shared Surfaces and Growth + Commerce work. He combines deep Android expertise with Kotlin migration and test automation skills—evidenced by contributions to the widely used leakcanary project, where he converted core Java instrumentation and sample code to Kotlin and fixed build/test issues. Comfortable in fast-moving product teams, Colin has internship experience across Google, Square, SAP, and CIBC that shaped his platform and SDK knowledge. Based in Seattle and grounded in a Computer Science degree from the University of Waterloo, he brings a pragmatic focus on reliability, memory safety, and shipping measurable user-facing improvements.
10 years of coding experience
4 years of employment as a software developer
Bachelor’s Degree Computer Science, Bachelor’s Degree Computer Science at University of Waterloo
Stackoverflow
26reputation
943reached
2answers
0questions
Github Skills (14)
kotlin10
instrumented-tests10
android-test10
junit10
instrumentation10
android-testing10
android10
test-automation10
testing10
java9
javas9
kotlin-coroutines6
xml6
android-jetpack-compose6
Programming languages (6)
Github contributions (5)
square/leakcanary
Apr 2019 - Apr 2019
A memory leak detection library for Android.
Role in this project:
Mobile Developer (Android) & Test Automation Engineer
Mobile Developer (Android) & Test Automation EngineerContributions:9 commits, 8 PRs, 11 pushes in 3 days
Contributions summary:Colin primarily contributed to the `leakcanary` project by converting Java files to Kotlin, specifically focusing on sample code, instrumentation tests, and the core instrumentation leak detection logic. Their work involved updating the sample application to Kotlin, adding a new button in MainActivity, and converting test classes to Kotlin, demonstrating a strong understanding of the Android development process and the Kotlin language. The user implemented a share to Stack Overflow button and fixed the build failure as well.
leak-canarydetection-libraryleak-detectionleakmemory
colinmarsch/gas.eth
Jan 2022 - Mar 2025
A simple React Native app to view current gas prices on the Ethereum blockchain
Contributions:44 reviews, 309 PRs, 327 pushes in 3 years 3 months
reactpricesethereumreact-nativegas-prices
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