Gracjan Jaśkiewicz
Senior Security Engineer at nexos.ai
Warsaw, Masovian Voivodeship, Poland
Summary
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SeniorGracjan Jaśkiewicz is a Senior Security Engineer based in Warsaw with eight years of hands-on experience in penetration testing and application/system security across consultancy, enterprise, and fintech environments. He has progressed from IT roles into leadership positions—most recently at nexos.ai after principal research work at HSBC and heading penetration testing at Kyndryl—bridging offensive testing with strategic security programs. Comfortable in both offensive red-team work and building repeatable security processes, he’s known for translating complex technical findings into actionable remediation for diverse stakeholders. Though concise on GitHub, his career demonstrates a pattern of tackling high-risk environments (banking, enterprise IT, and AI-focused startups), hinting at a pragmatic, risk-centered approach to security.
9 years of coding experience
4 years of employment as a software developer
Polish, English
Github Skills (6)
dns-resolver6
bruteforce4
dns3
go2
fault-injection2
penetration-testing1
Programming languages (3)
Github contributions (5)
gracjanj/dirtymobile
Aug 2019 - Mar 2026
Contributions:7 pushes, 1 branch in 6 years 8 months
gracjanj/Reflection-Tracer
Jul 2019 - Oct 2019
Contributions:35 commits, 34 pushes, 1 branch in 2 months
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