Marcin Cieślak
Principal Consultant at System Business Consulting
Frankfurt Rhine-Main Metropolitan Area Germany
Summary
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RockstarMarcin Cieślak is a Principal Consultant and enterprise architect based in Frankfurt with 15+ years building business-aligned IT solutions across telecommunications, internet services and public-sector projects in Germany, Poland and neighbouring countries. He combines hands-on systems and backend experience—demonstrated by contributions to projects like libsass, node-sass and the Mono runtime—with strategic practice in business process management and project delivery. Marcin advises international organisations on technology, governance and the rule of law, having served as a contractor for the Council of Europe and as an electronic voting expert for OSCE/ODIHR missions. He leads FRA✈WAW Consulting and System Business Consulting, and for nearly two decades has been active in Internet Society Poland, blending policy, advocacy and technical depth. Known for improving build systems, runtime stability and documentation in open-source projects, he brings a pragmatic, cross-disciplinary approach to solving complex IT and regulatory challenges.
15 years of coding experience
4 years of employment as a software developer
English, German, Russian, slavic languages, Polish
Github Skills (48)
code-optimization10
git10
debug10
libgit210
javascript10
c-language10
restructuredtext10
runtimes10
system-programming10
multiplatform10
sphinx10
freebsd10
net10
command-line-interface10
sass10
Programming languages (39)
Github contributions (5)
sass/sassc
Mar 2015 - Nov 2017
libsass command line driver
Role in this project:
Backend Developer
Backend DeveloperContributions:11 commits, 11 PRs, 2 pushes in 2 years 8 months
Contributions summary:Marcin primarily contributed to bug fixes and improvements within the `sassc` command-line tool. They addressed a double-free memory issue, fixed installation problems related to header files for autotools builds, and implemented support for a specific command-line option (-p). Additionally, the user reverted a change and rewrote a shell script, showcasing an understanding of the project's build processes and command-line interface. Their work demonstrates a focus on maintaining the functionality and stability of the Sass compiler's command-line tool.
command-linelibsasslinuxcli
sass/node-sass
Mar 2015 - Apr 2021
:rainbow: Node.js bindings to libsass
Role in this project:Back-end Developer
Back-end DeveloperContributions:15 releases, 5 reviews, 119 commits in 6 years 2 months
Contributions summary:Marcin primarily worked on modifying and improving the build process for the `node-sass` project. Their contributions involved implementing environment variable control for linking libsass, handling binary path issues, and introducing the SASS_BINARY_SITE environment variable for mirroring binaries. They also addressed assertion failures related to asynchronous operations, and refactored tests to separate runtime parameters. The commits focused on ensuring the project builds correctly and provides flexible configuration options.
libsasssassnode-jsjavascriptrainbow
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