All medalists.
IMO & IOI, including honourable mentions.
KTKonstantin TyshchukRussian FederationIMO2009Competition recordGold medalKVKonstantin VilchevskiBelarusIOI2013Competition recordBronze medalKYKonstantin YurshaUnion of Soviet Socialist RepublicsIMO1973Competition recordBronze medalKZKonstantin ZabarnyiIsraelIMO2010 · 2011 · 2012Competition recordHonourable mention · Bronze medalKSKonstanty SmoliraPolandIMO2023 · 2024Competition recordBronze medal · Gold medalKWKoon-Ho WongHong Kong, ChinaIOI2002A.B. Consulting LimitedManagerIndexed profileKMKoosha MoosaviIranIOI2022Sahra Kav Consulting Engineers Co.Full-Stack Developer — Geophysics Sounding Data PlatformIndexed profile
Korakot ChaovavanichThailandIMO1993 · 1994Kiatnakin Phatra Financial GroupVP, AI SpecialistAutumn profileKDKorina DigalakiGreeceIMO2016Competition recordHonourable mentionIndexed profileKTKornchawan TantivisethsakThailandIMO2025Competition recordHonourable mentionKGKornél György SzabóHungaryIMO2021Competition recordBronze medalKPKorneliusz Piotr ObarskiPolandIMO2021 · 2022Competition recordSilver medal
Kornél SzabóHungaryIOI2021Competition recordBronze medalAutumn profileKKKosma KasprzakPolandIMO2020 · 2022Competition recordSilver medalKNKostadin Nedelchev KoruchevBulgariaIMO1975 · 1976Competition recordBronze medalKTKostadin TrenčevskiYugoslaviaIMO1977Competition recordSilver medalKVKosta VukićevićMontenegroIMO2020Rivian and Volkswagen Group TechnologiesAndroid Software Engineer IIIndexed profileKSKostiantyn SavchukUkraineIOI2021HuaweiAlgorithm EngineerIndexed profileKTKota TokoroJapanIMO2021Competition recordSilver medal
Kouadio Désiré Martial AguessiIvory CoastIMO2012EYSenior Quantitative AnalystAutumn profileKSKoudai SakayamaJapanIOI2025Competition recordSilver medalIndexed profileKHKoyo HayashiJapanIMO2012Competition recordHonourable mentionKAKpayerigue Arnaud SiluéIvory CoastIMO2012Competition recordHonourable mentionKGKrasimir Georgiev IanakievBulgariaIMO1981 · 1982Competition recordSilver medal · Bronze medalKPKrassimir PaskalevBulgariaIOI1996OTBORDA.comBusiness ConsultantIndexed profileKÖKregor ÖöbikEstoniaIOI2022Competition recordHonourable mentionKCKresimir CosicCroatiaIOI1998LSSTC++ developerIndexed profileKNKrešimir NežmahCroatiaIMO2020 · 2021Competition recordBronze medal · Silver medalIndexed profileKNKrešimir NežmahCroatiaIOI2019 · 2020 · 2021Competition recordSilver medal · Bronze medalIndexed profileKLKrisel LekaAlbaniaIMO2025Competition recordHonourable mentionKRKrishanu Roy SankarUnited States of AmericaIMO2008Competition recordGold medalKPKrishna PothapragadaUnited States of AmericaIMO2024Competition recordGold medalKPKrišjānis PrūsisLatviaIMO2008University of LatviaResearcherIndexed profileKSKris StoparSloveniaIMO2004Competition recordHonourable mentionKČKristaps ČivkulisLatviaIOI2014 · 2015whiteCryptionIndexed profileKLKristaps LassLatviaIMO2024 · 2025Competition recordHonourable mentionKBKrist BlommeBelgiumIMO1986ArcelorMittal EuropeOperations PlannerIndexed profileKFKristel Fiorella Acuña GarcíaCosta RicaIMO2022MIT Laboratory for Translational EngineeringUndergraduate ResearcherIndexed profileKLKristian LatvanenFinlandIMO2022 · 2023Aalto UniversityResearch Assistant - Civil ConscriptIndexed profileKMKristian MinchevBulgariaIMO2019INSAIT - Institute for Computer Science, Artificial Intelligence and TechnologyResearcherIndexed profileKŠKristijan ŠimovićCroatiaIMO2024Competition recordSilver medalKŠKristijan ŠtefanecCroatiaIMO2015zavod za hitnu medicinumedicIndexed profileKAKristina Ana ŠkrebCroatiaIMO2005Faculty of Civil Engineering, University of ZagrebAssociate ProfessorIndexed profileKRKristina RogaleYugoslaviaIMO1991Competition recordBronze medalKTKristina TasevaNorth MacedoniaIMO2020Competition recordHonourable mentionKKKristiyan Kostadinov HaralambievBulgariaIOI1999 · 2000Competition recordBronze medal · Silver medal
Kristiyan VasilevBulgariaIMO2018 · 2019Institute of Mathematics and Informatics, Bulgarian Academy of SciencesPhD StudentAutumn profileKKKristjan-Erik KahuEstoniaIMO2020 · 2021 · 2022 · 2023CAFA TechPraktikantIndexed profileKLKristjan LeppEstoniaIMO2025 · 2026Competition recordHonourable mention · Bronze medalKLKristjan LeppEstoniaIOI2024 · 2025 · 2026Competition recordBronze medal · Gold medalKCKristof CsillagHungaryIOI2000Nolmecolindor Informatics Ltd.Founder, Software engineerIndexed profile
Kristóf KornisHungaryIMO2008 · 2009Morgan StanleyVice PresidentAutumn profileKSKristóf SomogyváriHungaryIOI2014GoogleSoftware EngineerIndexed profileKSKristóf SzabóHungaryIMO2019Competition recordBronze medalIndexed profileKKKristo KuusküllEstoniaIOI1997Competition recordSilver medalKMKristo MentEstoniaIMO2013Competition recordHonourable mentionKTKristo TammeojaEstoniaIOI2001BokuSoftware EngineerIndexed profileKBKrists BoitmanisLatviaIOI1996 · 1997Tom Sawyer SoftwarePrincipal Software EngineerIndexed profileKKKrists KrilovsLatviaIMO1997Competition recordBronze medalIndexed profileKBKrit BoonsirisethThailandIMO2016 · 2017Competition recordGold medalIndexed profile
Korakot ChaovavanichThailandIMO1993 · 1994Kiatnakin Phatra Financial GroupVP, AI SpecialistAutumn profileKDKorina DigalakiGreeceIMO2016Competition recordHonourable mentionIndexed profileKTKornchawan TantivisethsakThailandIMO2025Competition recordHonourable mentionKGKornél György SzabóHungaryIMO2021Competition recordBronze medalKPKorneliusz Piotr ObarskiPolandIMO2021 · 2022Competition recordSilver medalKornél SzabóHungaryIOI2021Competition recordBronze medalAutumn profileKKKosma KasprzakPolandIMO2020 · 2022Competition recordSilver medalKNKostadin Nedelchev KoruchevBulgariaIMO1975 · 1976Competition recordBronze medalKTKostadin TrenčevskiYugoslaviaIMO1977Competition recordSilver medalKVKosta VukićevićMontenegroIMO2020Rivian and Volkswagen Group TechnologiesAndroid Software Engineer IIIndexed profileKSKostiantyn SavchukUkraineIOI2021HuaweiAlgorithm EngineerIndexed profileKTKota TokoroJapanIMO2021Competition recordSilver medalKouadio Désiré Martial AguessiIvory CoastIMO2012EYSenior Quantitative AnalystAutumn profileKSKoudai SakayamaJapanIOI2025Competition recordSilver medalIndexed profileKHKoyo HayashiJapanIMO2012Competition recordHonourable mentionKAKpayerigue Arnaud SiluéIvory CoastIMO2012Competition recordHonourable mentionKGKrasimir Georgiev IanakievBulgariaIMO1981 · 1982Competition recordSilver medal · Bronze medalKPKrassimir PaskalevBulgariaIOI1996OTBORDA.comBusiness ConsultantIndexed profileKÖKregor ÖöbikEstoniaIOI2022Competition recordHonourable mentionKCKresimir CosicCroatiaIOI1998LSSTC++ developerIndexed profileKNKrešimir NežmahCroatiaIMO2020 · 2021Competition recordBronze medal · Silver medalIndexed profileKNKrešimir NežmahCroatiaIOI2019 · 2020 · 2021Competition recordSilver medal · Bronze medalIndexed profileKLKrisel LekaAlbaniaIMO2025Competition recordHonourable mentionKRKrishanu Roy SankarUnited States of AmericaIMO2008Competition recordGold medalKPKrishna PothapragadaUnited States of AmericaIMO2024Competition recordGold medalKPKrišjānis PrūsisLatviaIMO2008University of LatviaResearcherIndexed profileKSKris StoparSloveniaIMO2004Competition recordHonourable mentionKČKristaps ČivkulisLatviaIOI2014 · 2015whiteCryptionIndexed profileKLKristaps LassLatviaIMO2024 · 2025Competition recordHonourable mentionKBKrist BlommeBelgiumIMO1986ArcelorMittal EuropeOperations PlannerIndexed profileKFKristel Fiorella Acuña GarcíaCosta RicaIMO2022MIT Laboratory for Translational EngineeringUndergraduate ResearcherIndexed profileKLKristian LatvanenFinlandIMO2022 · 2023Aalto UniversityResearch Assistant - Civil ConscriptIndexed profileKMKristian MinchevBulgariaIMO2019INSAIT - Institute for Computer Science, Artificial Intelligence and TechnologyResearcherIndexed profileKŠKristijan ŠimovićCroatiaIMO2024Competition recordSilver medalKŠKristijan ŠtefanecCroatiaIMO2015zavod za hitnu medicinumedicIndexed profileKAKristina Ana ŠkrebCroatiaIMO2005Faculty of Civil Engineering, University of ZagrebAssociate ProfessorIndexed profileKRKristina RogaleYugoslaviaIMO1991Competition recordBronze medalKTKristina TasevaNorth MacedoniaIMO2020Competition recordHonourable mentionKKKristiyan Kostadinov HaralambievBulgariaIOI1999 · 2000Competition recordBronze medal · Silver medalKristiyan VasilevBulgariaIMO2018 · 2019Institute of Mathematics and Informatics, Bulgarian Academy of SciencesPhD StudentAutumn profileKKKristjan-Erik KahuEstoniaIMO2020 · 2021 · 2022 · 2023CAFA TechPraktikantIndexed profileKLKristjan LeppEstoniaIMO2025 · 2026Competition recordHonourable mention · Bronze medalKLKristjan LeppEstoniaIOI2024 · 2025 · 2026Competition recordBronze medal · Gold medalKCKristof CsillagHungaryIOI2000Nolmecolindor Informatics Ltd.Founder, Software engineerIndexed profileKristóf KornisHungaryIMO2008 · 2009Morgan StanleyVice PresidentAutumn profileKSKristóf SomogyváriHungaryIOI2014GoogleSoftware EngineerIndexed profileKSKristóf SzabóHungaryIMO2019Competition recordBronze medalIndexed profileKKKristo KuusküllEstoniaIOI1997Competition recordSilver medalKMKristo MentEstoniaIMO2013Competition recordHonourable mentionKTKristo TammeojaEstoniaIOI2001BokuSoftware EngineerIndexed profileKBKrists BoitmanisLatviaIOI1996 · 1997Tom Sawyer SoftwarePrincipal Software EngineerIndexed profileKKKrists KrilovsLatviaIMO1997Competition recordBronze medalIndexed profileKBKrit BoonsirisethThailandIMO2016 · 2017Competition recordGold medalIndexed profile