David Stemmer
Android Engineer at Speak
San Francisco, California, United States
Summary
👤
Senior🎓
Top SchoolDavid Stemmer is a Senior Android Engineer with 13+ years building mobile products, currently based in San Francisco and working at Speak after a long tenure at Lyft. He specializes in Android and Jetpack Compose, co-authored a server-driven UI platform and led the Android implementation of an embedded support chat using unidirectional data flow patterns, demonstrating both architectural depth and product-focused delivery. David pairs hands-on engineering — from low-level caching (contributions to the RoboSpice bitmap persister) to app-wide migrations — with cross-team leadership on projects that require backend, CMS, and client coordination. Comfortable moving between rapid prototyping and careful refactoring, he also brings secondary iOS experience, a background in video streaming and DRM, and a taste for game-tool scripting. Known for consensus-driven planning and clear technical accountability, he thrives in collaborative, fast-changing environments.
13 years of coding experience
12 years of employment as a software developer
Master's degree, Computer Science, Master's degree, Computer Science at Brandeis University
English, German
Github Skills (7)
javas10
caching10
bitmap10
bitmaps10
android10
java10
testing9
Programming languages (4)
Github contributions (5)
stephanenicolas/robospice
Feb 2013 - Feb 2013
Repo of the Open Source Android library : RoboSpice. RoboSpice is a modular android library that makes writing asynchronous long running tasks easy. It is specialized in network requests, supports caching and offers REST requests out-of-the box using extension modules.
Role in this project:
Mobile Developer (Android)
Mobile Developer (Android)Contributions:9 commits in 3 days
Contributions summary:David primarily contributed to the RoboSpice Android library, focusing on implementing and improving the in-memory caching system for bitmap objects. Their work involved creating new classes like `InMemoryBitmapObjectPersister` and `InFileBitmapObjectPersister`, along with related test classes. They also addressed code style violations and added javadoc documentation to the project.
network-requestsandroid-open-sourceasynchronousboxcaching
weefbellington/screenplay
Oct 2014 - May 2016
Contributions:5 releases, 496 commits, 39 PRs in 1 year 7 months
minimalistkotlinapplication-frameworkandroid
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