Maciej Bilas
Principal Systems Engineer at Cloudflare
Warsaw, Masovian Voivodeship, Poland
Summary
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Rockstar🎓
Top SchoolMaciej Bilas is a Principal Systems Engineer with 13 years of experience building high-performance, production-grade distributed systems from ad tech forecasting pipelines to global Cloudflare security services. He blends deep systems-level expertise (performance tuning, JVM and Go optimizations) with pragmatic product focus, having led features like API Shield OpenAPI validation and behavioral analytics for Bot Management at Cloudflare while navigating FedRAMP compliance. An active open-source contributor, he improved core algorithms in the widely used RoaringBitmap Go library by replacing custom bit-twiddling with optimized math/bits routines, boosting both speed and maintainability. Previous roles include designing custom datastores and cross-device training pipelines at Adform and low-latency telecommunication systems at SoftwareMill, showing comfort across JVM, Scala, Spark and cloud platforms. Based in Warsaw, he describes himself succinctly as someone who "shuffles bits for a living"—a hint at both low-level craftsmanship and a taste for elegant, efficient engineering.
13 years of coding experience
16 years of employment as a software developer
M.Sc., Computer Science, M.Sc., Computer Science at Politechnika Rzeszowska im. Ignacego ŁukasiewiczaIV Liceum Ogólnokształcące im. Mikołaja Kopernika w Rzeszowie
English, Polish
Stackoverflow
1,966reputation
87kreached
6answers
5questions
jersey
top-5%
jackson
top-5%
Github Skills (15)
bitmap10
bitmaps10
go10
bitset10
jackson9
jersey9
nunit6
parser-combinators6
assertion6
csv6
junit6
scala6
ruby6
ruby-on-rails6
serialization6
Programming languages (15)
Github contributions (5)
RoaringBitmap/roaring
Aug 2017 - May 2019
Roaring bitmaps in Go (golang), used by InfluxDB, Bleve, DataDog
Role in this project:
Back-end Developer
Back-end DeveloperContributions:50 commits, 36 PRs, 4 pushes in 1 year 9 months
Contributions summary:Maciej primarily focused on improving the efficiency and maintainability of the `roaring` Go library, specifically addressing bit population count and trailing zeros calculations. The contributions involved replacing older, less efficient functions with optimized alternatives from the `math/bits` package. The user also refactored code to leverage built-in Go functions, leading to improved performance and code clarity.
golangcreditsoftware-designelasticroaring-bitmaps
maciej/bme280
Feb 2018 - Jan 2020
BME280 driver written in Go
Contributions:2 releases, 19 commits, 13 PRs in 1 year 11 months
driverbme280
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