Leo Vysochyn
Principal Engineer at Atlassian
Gdańsk, Pomeranian Voivodeship, Poland
Summary
👤
Senior🎓
Top SchoolLeo Vysochyn is a Principal Engineer based in Gdańsk with over 18 years designing and delivering enterprise-grade applications and deep domain expertise in financial markets and investment banking. He combines hands-on engineering with leadership experience—having led teams and projects for more than nine years and built the first remote Jira Server team focused on modernizing the platform. Leo has a strong track record of performance-driven architecture work, including 10–20x workflow speedups, large-scale migrations, and improving CI reliability and dependency management for complex monorepos. He cares about quality, usability, security and scalability, and is the founder and maintainer of the Jxls library, a long-standing open-source tool for Excel reporting. Comfortable across the full software lifecycle, he moves between coding, architecture and people management to turn messy legacy systems into maintainable, high-throughput platforms. His background in applied mathematics underpins a pragmatic, data-informed approach to solving large-scale engineering problems.
14 years of coding experience
22 years of employment as a software developer
Master's degree Applied Mathematics, Master's degree Applied Mathematics at V. N. Karazin Kharkiv National University
English, Polish, German, Russian, Ukrainian
Github Skills (12)
excel-import10
jxls10
template-engine10
excel10
templating10
java10
security9
vulnerabilities9
fuzzing8
stability8
fuzz-testing8
json3
Programming languages (3)
Github contributions (5)
jxlsteam/jxls-1-legacy
May 2021 - Apr 2023
Legacy jxls-1 repo
Contributions:2 reviews, 4 PRs, 4 pushes in 2 years
jsonjxls
jxlsteam/jxls-reader
Jun 2015 - Jul 2022
A library to read data from Excel files into Java objects
Contributions:1 review, 45 commits, 5 PRs in 7 years 2 months
exceljavapoiexcel-import
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