Mikołaj Rejnowski
Senior Software Engineer at Visa
Poznan, Greater Poland Voivodeship
Summary
👤
Senior🎓
Top SchoolMikołaj Rejnowski is a Senior Software Engineer with a decade of experience building backend systems and leading cross-functional engineering teams across fintech and blockchain domains. He combines hands-on expertise in Java, Node.js, RESTful APIs and Solidity with a track record of shipping production services—from payment platforms and banking microservices to decentralized exchanges and browser games. As a former Technical Project Manager and Technical Lead, he blends product-focused design facilitation with architecture and delivery ownership, having led multiple teams through full project lifecycles. Currently at Visa, he continues to tackle high-scale, secure backend challenges while also exploring voxel engine development in his spare time. His background in automation for large server fleets and experience integrating banking partners reflect an ability to deliver both reliable infrastructure and customer-facing payment solutions.
10 years of coding experience
7 years of employment as a software developer
Licencjat (Lic.), Informatyka i Ekonometria, 4,5, Licencjat (Lic.), Informatyka i Ekonometria, 4,5 at Uniwersytet Gdański
Polish, English
Github Skills (96)
dbd10
video-processing10
rendering10
language-agnostic10
audio10
video-streaming10
rust10
discord10
low-latency10
designer10
discord-bot10
react10
internationalization9
azure-webjobs-sdk9
localization9
Programming languages (18)
Github contributions (5)
I-love-os/LoveShell
Oct 2018 - Dec 2018
Contributions:59 commits, 6 PRs, 43 pushes in 1 month
membraneframework-labs/video_compositor_snapshot_tests
Oct 2023 - Mar 2025
Contributions:4 reviews, 21 PRs, 54 pushes in 1 year 5 months
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