Hello world! My name is Bartosz Kostka and welcome to my homepage.

If you are looking for my GPG key, you can find it here.

Work

I work as a software developer at Google. Before that I was an intern at Google and Facebook. Prior to that, I worked as a contractor for Codility and Codilime - two IT companies based in Poland.

Publications

• Virtual Time Measurement in Programming Contests (2025)
• Sports Programming in Practice (2021)
• Towards Using Context-Dependent Symbols in CTC Without State-Tying Decision Trees (2019)
• Text-based Adventures of the Golovin AI Agent (2017)

Education

I earned a master's degree in Computer Science from the University of Wrocław, and a bachelor's degree in Joint Studies in Computer Science and Mathematics from the same university.

Sports programming

Sports programming is a mind sport focused on solving algorithmic puzzles. I am an international grandmaster and a top contributor on Codeforces - one of the biggest platforms with programming contests. I also won a bronze medal in the Polish Olympiad in Informatics and the Central European Regional Contest. Beyond competing, I am dedicated to building and supporting the global competitive programming ecosystem. I am a maintainer of cp-algorithms.com, the open-source resource for algorithms and data structures, and serve on the Organizational Committee of the Universal Cup and Algorithmic Engagements. I was also involved with Google Kick Start.

Teaching & Olympiads

I used to teach informatics at the 14th High School in Wrocław and the 1st High School in Lubin, my home town, but now I focus more on personal tutoring with gifted students. My students have achieved significant success in the Polish Olympiad in Informatics (7 gold, 5 silver, and 10 bronze medals) and the International Olympiad in Informatics (5 gold, 1 silver, and 1 bronze medal).

My scientific work extends to organizing national and international high school informatics competitions. I serve as the Chair of the International Scientific Committee (ISC) for the International Olympiad in Informatics (IOI), the Vice President of the Polish Junior Olympiad in Informatics (OIJ), and a member of the Scientific Committee for the Pan-African Olympiad in Informatics (PAOI).

Travelling

In my free time, I love travelling and visiting new places. I have visited 80+ countries on 6 continents.

Fun facts

I am a lifeguard, I have a green belt in Kyokushin, and my favorite dish to prepare is Pad Thai.