Mathias Mortensen
Software Engineer at Optiver
Amsterdam, North Holland, China
Summary
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Rockstar🎓
Top SchoolMathias Mortensen is a software engineer with 11 years of experience, currently building trading systems at Optiver after engineering roles at Meta and internships across Facebook, Palantir, and PlayStation. He blends strong Android and full-stack expertise—demonstrated by notable open-source contributions to Facebook's Fresco and Flipper projects, where he added disk-cache support, migrated plugins to new frameworks, and improved debugging visualizations. Comfortable working on low-level memory and UI tooling, he has a track record of reducing flakiness in tests and modernizing build processes. Trained at the University of Copenhagen with study abroad at UC Berkeley, Mathias pairs rigorous academic foundations with practical, production-focused problem solving and a taste for developer tooling improvements that aren’t always visible to end users.
11 years of coding experience
3 years of employment as a software developer
Study abroad, Computer Science, Study abroad, Computer Science at University of California, BerkeleyBSc, Computer Science, BSc, Computer Science at Københavns Universitet - University of Copenhagen
Github Skills (17)
debugging10
ui-design10
java10
fresco10
javas10
uid10
front-end-development10
android10
react10
image-processing9
antd9
typescript9
typescript-types9
ant9
typescripts9
Programming languages (7)
Github contributions (5)
facebook/fresco
Dec 2019 - Sep 2021
An Android library for managing images and the memory they use.
Role in this project:
Mobile Developer (Android)
Mobile Developer (Android)Contributions:1 release, 57 commits, 5 PRs in 1 year 9 months
Contributions summary:Mathias contributed to the Fresco Android image library by improving the debug overlay for the Vito module, adding a debug overlay for the Vito module, and enhancing the display of image origin in the debug overlay. They also addressed flakiness in screenshot tests and migrated to Robolectric 4.1. In addition, the user modified the build process by bumping the Gradle version and updated the FlipperImageTracker with added disk cache support.
android-library
facebook/flipper
Mar 2020 - Sep 2021
A desktop debugging platform for mobile developers.
Role in this project:Full-stack Developer
Full-stack DeveloperContributions:7 commits in 1 year 5 months
Contributions summary:Mathias primarily contributed to the Fresco plugin within the `flipper` repository, a desktop debugging platform. Their work involved enhancing the Fresco plugin with disk cache support and making it toggleable. They also migrated the Fresco plugin to the Sandy framework, refactoring code and updating UI elements. Furthermore, the user implemented a memory consumption treemap tab, improving the plugin's visualization capabilities.
debuggingmobile
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