Oleh Zheleznyak
Software Engineering Director For Time Tracking at Appfire
Gdańsk, Pomeranian Voivodeship, Poland
Summary
👤
Senior🎓
Top SchoolOleh Zheleznyak is a software engineering leader with 10+ years of hands-on experience architecting distributed .NET systems and delivering end-to-end products in fast-paced, multicultural environments. Currently directing Time Tracking engineering at Appfire, he has a track record of forming and scaling high-performing teams, improving sprint predictability and shipping the majority of commitments. He combines deep technical ownership—designing cloud-native architectures, reducing MTTR, and tackling technical debt—with strong people leadership: mentoring, hiring, and establishing coding standards that teams embrace. Notable achievements include leading a cloud-native SaaS migration on GCP and turning struggling teams into reliable deliverers while introducing CI, automated testing, and IaC. He pairs a mathematics master’s background with a pragmatic focus on measurable improvement (e.g., doubling responsiveness and cutting false-positive alerts significantly). Colleagues describe him as a coach-builder who balances long-term architectural vision with the discipline of delivery.
10 years of coding experience
15 years of employment as a software developer
Master's degree, MATHEMATICS AND STATISTICS, Master's degree, MATHEMATICS AND STATISTICS at Taras Shevchenko National University of Kyiv
Russian, Ukrainian, Polish, English
Stackoverflow
3,413reputation
292kreached
94answers
5questions
visual-studio
top-5%
Github Skills (48)
microsoft10
microsoft-azure10
azure10
dotnet9
coreclr9
csharp9
dotnet-core9
visual-studio9
fluent-api7
netcore6
data-structures6
nhibernate6
sql-server6
mstest6
asp-net-core6
Programming languages (4)
Github contributions (5)
oleh-zheleznyak/ElementsOfProgrammingInterviews
May 2016 - Jun 2022
Exercises and challenges from the book Elements of Programming Interviews: The Insiders' Guide
Contributions:2 reviews, 44 PRs, 159 pushes in 6 years 2 months
elements-of-programming-interviewscppelementsjavascriptinsiders
oleh-zheleznyak/Codility
Jul 2016 - Aug 2021
Contributions:14 commits, 13 pushes, 1 branch in 5 years 2 months
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