Marek Cirkos
Software Engineer at Meta
England, United Kingdom
Summary
🤩
Rockstar🎓
Top SchoolMarek Cirkos is a seasoned software engineer with 11 years of experience, currently working at Meta on SparkSL, Meta's shader compiler. He has deep iOS and tooling expertise—contributing to high-profile open-source projects like facebook/idb and WebDriverAgent to improve simulator automation, XCUITest support, and test orchestration. Marek blends build-system and DevOps know-how demonstrated in contributions to Buck and osquery, where he streamlined macOS builds and reduced build redundancy. Early founder and frequent contract iOS developer, he pairs practical product experience with a strong academic background in mathematics (University of Warsaw). Notably, he often focuses on making developer workflows more reliable and automatable, surfacing subtle errors and improving test infrastructure.
11 years of coding experience
13 years of employment as a software developer
Master's degree, Mathematics, Thesis: Decision trees with soft tests, Master's degree, Mathematics, Thesis: Decision trees with soft tests at University of Warsaw
English
Github Skills (32)
uitest10
objective-c10
buck10
c-language10
ios10
xcuitest10
testing10
xctest10
xcode10
build-automation10
mobile10
cprogramming-language10
ui-testing10
monitoring9
cicd9
Programming languages (9)
Github contributions (5)
facebookarchive/WebDriverAgent
Oct 2015 - Jan 2019
A WebDriver server for iOS that runs inside the Simulator.
Role in this project:
Mobile Developer (iOS)
Mobile Developer (iOS)Contributions:566 commits, 217 PRs, 127 pushes in 3 years 3 months
Contributions summary:Marek appears to be focused on developing and testing iOS applications. They have implemented an XCUITest proof of concept, indicating a focus on UI testing and integration of new testing frameworks. Their contributions include refactoring of existing code, such as moving core WDA functionality to enable code reuse, and contributing to command handler updates, which suggests work within the framework's core functionality. Furthermore, they are making adjustments to both code and documentation to enhance the performance and stability of the app.
ioswebdriver
facebook/idb
Dec 2015 - Jun 2018
idb is a flexible command line interface for automating iOS simulators and devices
Role in this project:iOS Developer
iOS DeveloperContributions:138 commits, 12 PRs, 11 pushes in 2 years 7 months
Contributions summary:Marek primarily contributed to the `facebook/idb` repository by working on the iOS simulator automation features. They focused on enhancing simulator management, including improving error messages when allocating simulators and getting binary names from the Info.plist files. They also implemented functionality related to managing and launching XCTest bundles within the iOS simulator environment. The user also added features for handling test processes and managing test manager connections.
command-line-interfaceios-simulator
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