Ján Hozza

Ján Hozza is a Slovak software engineer and competitive programmer. He represented Slovakia at the International Olympiad in Informatics in 2010 and 2011, winning a silver medal both years. He studied informatics at Comenius University, competed at the ACM-ICPC World Finals in 2016, worked as a software engineer at Facebook in California (2016-2019), then led engineering at Cognexa in Bratislava (2019-2021). He is based in Bratislava, Slovakia.

Notes7

• Won silver at IOI 2010 (657/820, rank 48) and IOI 2011 (428/600, rank 46) representing Slovakia, a rare back-to-back IOI medalist for a small delegation.Jul 29, 2011
• Worked as a software engineer at Facebook in California for ~2.5 years before returning to Bratislava, per his own mentor bio.
• Served as Head of Engineering at Cognexa (Bratislava) 2019-2021, then moved to an undisclosed software engineering role; a trajectory from IC at a US big-tech to engineering leadership at a Slovak startup.
• Reached the ACM-ICPC World Finals 2016 with Comenius University (rank 51), alongside Eduard Batmendijn and Michal Anderle, showing sustained elite-level programming after high school.May 19, 2016
• Reached the ACM-ICPC World Finals 2016 with Comenius University (rank 51, 'Zelovoc svetla'), alongside Eduard Batmendijn and Michal Anderle, and won ICPC WF 2014 bronze (rank 12) with Tomas Bela and Peter Fulla, showing sustained elite-level programming well after high school.May 19, 2016
• Competed as 'jablko' on Codeforces and Topcoder, the handle linking his competitive-programming identity across platforms.
• Studied informatics at Comenius University (Matfyz/FMFI) and organized the Korespondencny seminar z programovania (KSP), a Slovak correspondence seminar in programming that feeds the national olympiad pipeline.
• Studied informatics at Comenius University (Matfyz/FMFI) and organized the Korespondencny seminar z programovania (KSP), the Slovak correspondence seminar in programming that feeds the national olympiad pipeline.
• Returned to his old high school (Gymnazium Jura Hronca, Bratislava) in May 2018 to give an alumni lecture 'O kompresii dat' (On data compression), staying engaged with the Slovak CS/education community he grew out of.May 2018
• Taught at FMFI UK (Comenius University), appearing in the faculty timetable as a teacher in 2016-17 and 2019-20, tying his post-Facebook years to the institution he studied at.
• No personal website, blog, GitHub or published articles surfaced across repeated name/handle searches; his public footprint is competitive-programming records (IOI/ICPC/Codeforces/Topcoder as 'jablko'), LinkedIn, and community/mentoring pages rather than open-source or writing.
• Volunteers as a mentor (LEAF) and lists interests in music, ultimate frisbee, disc golf and acroyoga, indicating an active community/sports side beyond engineering.