Mateusz Haligowski
Senior Software Engineer at Yahoo
Seattle, Washington, United States
Summary
👤
Senior🎓
Top SchoolMateusz Haligowski is a senior software engineer with 13 years of experience building data-intensive, scalable systems across Big Tech and startups, currently working on antispam data pipelines for Yahoo Mail in Seattle. He combines strong backend engineering and data warehousing expertise with practical ML feature engineering and Google Cloud integrations, honed at Google, Facebook, and Amazon. Mateusz emphasizes robust, extensible solutions and continuous improvement, pairing technical depth with teamwork and process-focused development. An active contributor to reputable open-source projects like AssertJ, he has a knack for improving developer ergonomics—adding character-set-aware file reading and thorough cross-platform tests. With dual advanced degrees in computer science and applied econometrics, he brings a rare blend of statistical rigor and production-grade software craftsmanship.
13 years of coding experience
14 years of employment as a software developer
MSc Computer Science, MSc Computer Science at Gdańsk University of TechnologyMA Applied Econometrics, MA Applied Econometrics at University of GdanskHigh School, High School at Gdynia Bilingual High School No. 3
English, German, Polish, Spanish
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (11)
assertion10
type-assertion10
javas10
java10
testing10
fileio9
file-access9
unit-test9
junit9
file-handling9
file-processing9
Programming languages (8)
Github contributions (5)
assertj/assertj
Apr 2014 - Sep 2014
AssertJ is a library providing easy to use rich typed assertions
Role in this project:
Back-end Developer
Back-end DeveloperContributions:26 commits in 4 months
Contributions summary:Mateusz contributed to the `assertj/assertj` repository by implementing a utility function `linesOf` to read file content line by line, adding functionality for character set handling. They also added unit tests to validate the functionality, covering cases for different line endings (Unix, Windows, Mac) and character sets. Furthermore, they modified existing test files to align with file content and expanded functionality for extracting single values using the extractor.
assertionsassertjtestingtyped-assertionstyped
mhaligowski/dotfiles
Jun 2016 - Jan 2024
Contributions:5 pushes, 1 branch in 7 years 8 months
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