Grzegorz Kozub
Senior Software Engineer at APSIS
Warsaw, Masovian Voivodeship, Poland
Summary
👤
Senior🎓
Top SchoolGrzegorz Kozub is a Senior Software Engineer with 13 years of experience designing and modernizing scalable back-end systems, currently shaping the public API of the Apsis One platform from Warsaw. He brings deep .NET expertise—ranging from tuning async and memory allocations in legacy ASP.NET apps to rearchitecting services with .NET Core, Ports & Adapters and CQRS—and a pragmatic focus on small, frequent delivery increments. His track record includes leading migrations from monoliths to cloud-ready deployments, adding database sharding/replication and continuous deployment pipelines to reduce downtime from hours to minutes. A hands-on architect and team leader, he pairs performance-driven engineering with product-aware practices inspired by customer-centric discovery. Unusually for someone rooted in .NET, he also invests time learning diverse tech stacks and emphasizes integration and automated testing to keep risk low while moving fast.
13 years of coding experience
11 years of employment as a software developer
Electronic Technician, Computer Science and Electronics, 4.95, Electronic Technician, Computer Science and Electronics, 4.95 at Technical College of the Jaworzno III Power PlantBachelor, Computer Science, 4.45, Bachelor, Computer Science, 4.45 at Uniwersytet Śląski w Katowicach
Polish, English
Stackoverflow
1reputation
0reached
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Github Skills (195)
windows10
vim10
lua10
ascii10
helix10
hud10
concurrency10
slugify10
linux10
stream10
visual-studio-extension10
rust10
slug10
developer-tools10
cli10
Programming languages (14)
Github contributions (5)
GrzegorzKozub/vscode
Apr 2019 - Feb 2025
Contributions:186 pushes, 1 branch in 5 years 11 months
GrzegorzKozub/toys
Feb 2021 - Nov 2024
Contributions:82 pushes, 1 branch in 3 years 10 months
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