Krzysztof Sobolewski
Internal IT Systems Manager at STX Next
Lubusz Voivodeship, Poland
Summary
🤩
Rockstar🎓
Top SchoolKrzysztof Sobolewski is a seasoned backend engineer with 18 years of professional experience and over two decades of hands-on software development, currently contracting as a Trino engineer at Starburst in Warsaw. He has deep expertise in distributed systems, data platforms and migration projects, evidenced by his contributions to the official Trino repository focused on code quality, refactoring and bug fixes for a high-profile open-source SQL engine. Past roles at Goldman Sachs and HRS Group show his ability to drive MVPs, re-engineer dataflow platforms, migrate legacy systems to modern toolchains and own critical backend services like SSO. Comfortable across Java, cloud (AWS), Docker and event-sourcing patterns, he often acts as the team’s "toolmaker" improving developer workflows and code hygiene. Colleagues rely on him for pragmatic, low-overhead solutions and for improving correctness with tools such as Error Prone checks—an attention to detail that surfaces in both production systems and open-source work.
18 years of coding experience
20 years of employment as a software developer
Licensee, Industrial Automation, Licensee, Industrial Automation at Technical High School in Zielona GóraM.Sc., B.Sc., Computer Science, Summa cum Laude, M.Sc., B.Sc., Computer Science, Summa cum Laude at Technical University in Zielona Góra
English, Polish
Github Skills (10)
javas10
refactoring10
software-quality10
error-prone10
java10
database7
databases7
query-engine6
sql6
big-data5
Programming languages (5)
Github contributions (5)
trinodb/trino
Jun 2021 - Jan 2023
Official repository of Trino, the distributed SQL query engine for big data, formerly known as PrestoSQL (https://trino.io)
Role in this project:
Back-end Developer
Back-end DeveloperContributions:571 reviews, 16 commits, 131 PRs in 1 year 6 months
Contributions summary:Krzysztof's commits primarily focus on code quality improvements and refactoring within the Trino project. They implemented Error Prone checks to improve code correctness by removing null checks for primitive types and ensuring correct usage of preconditions and format strings. The user also addressed bugs and inconsistencies in the codebase by fixing the handling of views and masks, as well as correcting code formatting in various files.
prestodbdbmsindexingjdbcbigdata
ksobolew/airlift
Oct 2021 - Jan 2025
Airlift framework for building REST services
Contributions:11 pushes, 6 branches in 3 years 3 months
rest-apipythonrestrest-services
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