Gyojun Youn

Gyojun Youn (윤교준), born June 2001, is a South Korean competitive programmer and software developer. He graduated Gyeonggi Science High School (2020), studied Computer Science and Engineering with a double major in Mathematical Sciences at Seoul National University (2020-2025), and began a master's in Computer Software Engineering at KAIST in 2025. He won silver at IOI 2018 and gold at IOI 2019 for the Republic of Korea, was an ICPC World Finals 2021 gold medalist (4th), won the Nexon Youth Programming Challenge in 2018, and served as head coach of the Korean IOI team and as a problem setter for Korean contests. His LinkedIn-indexed work history lists a Quantitative Developer role at Orca Technologies from Aug 2025.

Notes6

• Quant employment verification: UNRESOLVED. The LinkedIn-role lead lists a Quantitative Developer at 'Orca Technologies' (from Aug 2025, no end date), but it exists only in the LinkedIn-index enrichment (index-only, not primary-source confirmation); no independent primary source confirms the role. 'ORCA Technologies' is an ambiguous name: web search surfaces no Korean quantitative/algorithmic trading or market-making entity by that name, only unrelated firms (ORCA Technologies GPS, a US defense/space firm; ORCA Computing; Orca Security; Orca Technologies AS; Orca Traders/EU options education). Identity is well-supported (Olympiad/ICPC/blog/X cross-links), but the employer's quant-finance status is unverified, so quant employment cannot be CONFIRMED or NOT CONFIRMED.
• Identity cross-verified across independent primary sources: the ICPC ID page (icpc.global/ICPCID/7TIL17TVT8TD) lists Gyojun Youn, Seoul National University, [contact omitted]; his X profile @youngyojun (bio 'ICPC World Final Gold-medalist', BOJ yclock / CF GyojunYoun) links back to his personal site; and the site, IOI stats page and CP Hall of Fame all describe the same competitive record.
• IOI medals: silver (58th) at IOI 2018, gold (22nd) at IOI 2019, both for the Republic of Korea.
• ICPC World Finals 2021 gold medalist (4th place), and his SNU team won the ICPC Asia Seoul Regional three consecutive years (2020, 2021, 2022) — reported as the only team to win three regionals in a row.
• Served as head coach of the Korean IOI 2022 national team and as a problem setter/verifier for Korean contests including NYPC (2021, 2022) and KOI; problem setter for the 2025 ICPC Asia Korea National First Round and Seoul Regional.
• Past roles from LinkedIn-index (index-only): Contents Innovator at Branch and Bound / CodeTree (2023-2025, designed adaptive testing and IRT models for COEIC), Teaching Assistant at Samsung Electronics (2020-2022, taught algorithms to Samsung software developers), and Student Coach at KIISE (Korean Institute of Information Scientists and Engineers). None of these is classified as quantitative finance.
• Public contact: [contact omitted] and [contact omitted], both published on his own about page / ICPC profile.
• Born 2001-06-10 (윤교준). Undergraduate: Seoul National University, Computer Science and Engineering + Mathematical Sciences double major (2020-2025); master's in Computer Software Engineering at KAIST from 2025 (per LinkedIn). GPA 4.26/4.3 reported on his own about page.
• Won the Nexon Youth Programming Challenge (NYPC) 2018 Grand Prize (Minister of Culture, Sports and Tourism award); was 2nd/gold in 2017 and received the 2019 Early Bird Special Award.
• Technical competition profiles: Baekjoon Online Judge 'yclock' (Rank 43) and solved.ac Rank 4; Codeforces 'GyojunYoun' max rating 2730 (International Grandmaster).
• Member of Samsung Software Membership (secmem.org, author youngyojun) from Dec 2020; President of SNUPS (SNU programming/algorithm club) in 2021.
• Presidential Science Scholarship (대통령과학장학금), 18th cohort, from March 2020.