Nelson Osacky
Senior Software Engineer at Sentry
Berlin, Germany
Summary
🤩
Rockstar🎓
Top SchoolNelson Osacky is a Senior Software Engineer based in Berlin with 12 years specializing in developer productivity, build systems, Gradle, and Android performance. He has driven tangible build-speed and caching improvements at companies like SoundCloud and Square—bringing builds from minutes to seconds—and led solutions engineering at Gradle Inc. as well as contributions to high-profile open-source projects including Gradle and Apache Beam to improve cache sensitivity and up-to-date checks. Nelson also maintains and optimizes the Home Assistant Android companion app, modernizing its build configuration and addressing database migration issues. Comfortable across mobile, backend build tooling, and CI/CD, he combines hands-on coding with systems-level thinking to make developer workflows faster and more reliable. His background spans leadership roles, deep open-source impact, and a knack for finding subtle inputs (like empty directories or path sensitivities) that silently break caching.
13 years of coding experience
11 years of employment as a software developer
Genie informatique, Genie informatique at Université de Technologie de CompiègneUniversity of Illinois Urbana-ChampaignHong Kong University of Science and Technology (HKUST)
French, Spanish, German
Stackoverflow
599reputation
32kreached
16answers
4questions
Github Skills (45)
kotlin10
caching10
buck10
ios10
beam10
cachemanager10
build-gradle-kts10
android-applications10
android-development10
cicd10
java10
android-developer10
javas10
automation10
android-app10
Programming languages (19)
Github contributions (5)
home-assistant/android
Oct 2020 - Oct 2021
Home Assistant Companion for Android
Role in this project:
Mobile Developer (Android)
Mobile Developer (Android)Contributions:3 reviews, 10 commits, 21 PRs in 11 months
Contributions summary:Nelson primarily focused on updating and maintaining the Home Assistant Android companion app. Their contributions included updating the Android Gradle plugin, Kotlin, and other dependencies. They also made changes to build configurations, including the addition of Gradle build scans, and addressed issues related to Room database migrations and export schema warnings. Further work involved updating the distribution plugin and optimizing the build process, along with overall version upgrades and configuration adjustments.
androidhome-assistantkotlinhome-automationopen-source-app
uber/okbuck
Apr 2017 - Feb 2018
OkBuck is a gradle plugin that lets developers utilize the Buck build system on a gradle project.
Role in this project:Automation Engineer / Build & Release Engineer
Automation Engineer / Build & Release EngineerContributions:18 commits, 20 PRs, 57 comments in 10 months
Contributions summary:Nelson primarily focused on improving the build process and configuration of the OkBuck Gradle plugin. They made updates to Gradle wrapper versions, ensured correct task descriptions and groupings, and implemented features such as requiring the wrapper to be enabled. These changes included refactoring tasks, adding support for resource union, and adding better error messages for dependencies. The user also modernized the codebase through using try-with-resources.
build-systemgradlegradle-pluginbuckwatchman
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