Vlatko Kosturjak
Software Engineer at Diverto
Zagreb, Croatia
Summary
🤩
RockstarVlatko Kosturjak is a seasoned software engineer with 17 years of hands-on experience focused on low-level back-end engineering and security tooling. Based in Zagreb, he contributes to notable open-source projects—such as the Equihash miner for NiceHash and the widely used John the Ripper jumbo—where he improves performance, robustness, and cross-platform compatibility. His work spans optimization for diverse CPU architectures, OpenCL build hardening, and pragmatic tooling for ripping distributed version control systems (SVN/Git/HG/CVS). Known as a free software and security contributor, he combines deep systems knowledge with practical networking features like SSL/proxy support. Colleagues would describe him as a detail-oriented engineer who uncovers platform-specific quirks and turns them into reliable, reproducible builds.
17 years of coding experience
English, Croatian, Bosnian, Serbian
Stackoverflow
146reputation
29kreached
1answer
1question
Github Skills (37)
opencl10
git10
c-language10
svn10
zcash10
cracking10
c1110
perl10
cvs10
c1710
cryptocurrency10
mining10
subversion10
gpu10
passwords10
Programming languages (23)
Github contributions (5)
kost/dvcs-ripper
Oct 2012 - Aug 2020
Rip web accessible (distributed) version control systems: SVN/GIT/HG...
Role in this project:
Back-end Developer
Back-end DeveloperContributions:46 commits, 8 PRs, 30 pushes in 7 years 11 months
Contributions summary:Vlatko contributed significantly to a Perl-based tool designed to rip version control systems. Their primary contribution was the initial implementation of `rip-git.pl`, a core component for extracting data from Git repositories. The user then expanded the tool's capabilities by adding support for Subversion (SVN) and CVS, implementing `rip-svn.pl` and `rip-cvs.pl`. They also incorporated features such as SSL certificate ignoring and proxy support for broader compatibility.
hacklangmercuriallibgit2opamgit-gui
nicehash/nheqminer
Oct 2016 - Oct 2016
Equihash miner for NiceHash
Role in this project:Back-end Developer
Back-end DeveloperContributions:16 commits, 1 comment in 1 day
Contributions summary:Vlatko primarily focused on enhancing the core functionality of the Equihash miner, demonstrating expertise in low-level optimization. Their contributions include enabling support for various mining pools and CPU architectures like the Xenoncat solver. They also added support for a Mac OS X barrier implementation.
nicehashequihashminer
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