Alexej Haak
Senior Engineering Manager at ESL FACEIT Group - EFG
Schleswig-Holstein, Germany
Summary
👤
Senior🎓
Top SchoolAlexej Haak is a Senior Engineering Manager based in Schleswig-Holstein, Germany, with 11 years of experience building and leading high-performing software teams across gaming, enterprise, and startup environments. He combines deep technical fluency—evidenced by hands-on contributions to the Scala formatter scalafmt—with pragmatic people leadership, scaling teams at ESL FACEIT Group and earlier serving as head of engineering and project lead roles. Known for bridging architecture and execution, he focuses on shipping robust backend systems, addressing edge cases, and improving developer workflows. Alexej’s background in both computer science and business education gives him a rare mix of technical rigor and product-minded decision making. He thrives in fast-paced, cross-functional settings where clean code and clear team dynamics matter equally.
11 years of coding experience
10 years of employment as a software developer
Bachelor of Science (B.S.), Bachelor of Education, Wirtschaftswissenschaften im Profil Handelslehramt / Informatik, Bachelor of Science (B.S.), Bachelor of Education, Wirtschaftswissenschaften im Profil Handelslehramt / Informatik at Christian-Albrechts-Universität zu Kiel
German, English
Stackoverflow
480reputation
19kreached
9answers
9questions
Github Skills (18)
formatter10
scala10
formatters10
code-formatting10
testing9
refactoring9
data-structures6
android-viewpager6
design-patterns6
screeps6
android6
amazon-s36
android-fragments6
algorithms6
algorithm6
Programming languages (14)
Github contributions (5)
scalameta/scalafmt
Feb 2017 - May 2017
Code formatter for Scala
Role in this project:
Backend Developer
Backend DeveloperContributions:6 commits, 10 PRs, 31 comments in 3 months
Contributions summary:Alexej primarily contributed to the core logic of the code formatter. They focused on implementing a new feature to add newlines before top-level statements, and they also addressed edge cases related to it. Furthermore, the user fixed formatting issues, incorporated test cases, and corrected compilation errors. They also made several code adjustments to comments and annotations.
formatterscalacode-formatter
Daxten/Mirage-Reactive-Extensions
Jun 2023 - Jan 2025
Contributions:9 releases, 30 pushes, 1 branch in 1 year 6 months
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