Oleh Naver

Oleh Naver is a Ukrainian competitive programmer, the most decorated Ukrainian at the International Olympiad in Informatics: silver in 2020 and gold in 2021 and 2022. He was also the absolute winner of EJOI 2020 and a three-time Ukrainian national olympiad gold medalist. A UOI interview had him studying at the National University of Singapore and teaching programming; a structured people index separately lists University of Cambridge and a 2025 Citadel Securities quantitative research role, both unverified.

Notes8

• Quant employment verification: UNRESOLVED. The only employment lead is an index record on his LinkedIn URL listing a Citadel Securities 'Quantitative Researcher' role dated 2025 (Jul-Sep, London). Citadel Securities does operate in quantitative finance (systematic market-making/trading), so the employer classification would qualify, but the role itself is NOT primary-source confirmed: no company page, press item, or self-statement corroborates it, and the index is not independent confirmation. His identity is supported (LinkedIn headline 'IOI Gold x2 & Silver' matches the IOI record; username oleh-naver-84b110248), so the uncertainty is on the employment evidence, not the person. A student/internship-type 2025 role is plausible for a student but cannot be distinguished from a program or an unconfirmed offer, so the claim is retained as uncertain rather than CONFIRMED.
• Two-time IOI gold medalist (2021 rank 25, 2022 rank 14) and 2020 silver, representing Ukraine; the most decorated Ukrainian at the IOI per UOI.
• An index record tied to this LinkedIn URL lists a 'Quantitative Researcher' role at Citadel Securities dated 2025 (Jul-Sep) in London plus University of Cambridge education; no primary source (company page, press release, personal statement) was found to corroborate either claim, so both remain unverified index-only leads, not confirmed employment or education.
• Consolidation: no primary source places him at any quantitative-finance employer; the only Citadel Securities signal is the index record, and the LinkedIn headline he controls says 'IOI Gold x2 & Silver, Maths enthusiast' rather than any employer, so the quant employment claim cannot be confirmed from public primary evidence.
• Absolute winner (champion) of the European Junior Olympiad in Informatics 2020, per EJOI's own page.
• In a UOI interview he said he was studying at the National University of Singapore and doing a little programming teaching on the side; he credited olympiad experience as helping with teaching, not with a career claim.
• UOI reports he was a graduate of Kremenchuk Lyceum Polit and finished 14th at IOI 2022, which UOI frames as the strongest Ukrainian IOI result since 2005 in a team that also included Roman Yanushevskyi.
• UOI interview bio lists three-time gold medalist of the Ukrainian Olympiad in Informatics 2019-2021.
• His Codeforces handle is oleh1421 (International Grandmaster) and his AtCoder handle is oleh1421 (5 Dan, highest rating 2920, last competed 2024-08-25); both profiles carry the Ukraine flag, corroborating the same competitive-programming identity.
• Says his most instructive competition was UCPC 2021, which his team won after a poor start.
• A peer interview ('EPISODE 2: Interview with Oleh Naver', by Agnimandur) covers his introduction to competitive programming and IOI preparation; it is a third-party interview, not authored output by him, so it does not evidence work or writing.