Dion Stephan Ong

Dion Stephan Ong is a Filipino computer scientist and competitive programmer. He represented the Philippines at the International Mathematical Olympiad 2019 (bronze) and the International Olympiad in Informatics 2019 and 2020 (both bronze), and competes under the Codeforces handle dsjong. He graduated summa cum laude from Yale University in May 2024 with combined Bachelor of Science and Master of Science degrees in Computer Science (perfect 4.00 GPA), after being valedictorian of his Ateneo de Manila senior high school batch. He works as a Core Developer at Hudson River Trading in New York and previously interned as a Software Developer at The D. E. Shaw Group (summer 2023) and as a Software Engineer at Microsoft (2022).

Notes6

• Quant employment verification: CONFIRMED - identity supported (Olympiad + Yale/Ateneo pubic records align with LinkedIn). Actual roles: HRT Core Developer since 2024 (proprietary algorithmic trading firm) and DE Shaw Group Software Developer Intern summer 2023 (quant-focused hedge fund). Microsoft SWE Intern 2022 is not a quant role.2024
• Identity confirmed: LinkedIn profile (dsjong) names Dion Stephan Ong, Core Developer at Hudson River Trading, CS at Yale - matching the Philippines IMO 2019 bronze medalist and IOI 2020 contestant of the same name.Aug 6, 2026
• Core Developer at Hudson River Trading (New York) since 2024, per professional index data; HRT is a proprietary algorithmic/high-frequency trading firm, i.e. genuine quant-finance employer.2024
• Software Developer Intern at The D. E. Shaw Group, New York, summer 2023 (Jun-Aug 2023 per unverified lead); D. E. Shaw is a hedge fund / quantitative investment firm.2023
• Graduated summa cum laude from Yale University with a perfect 4.00 GPA in May 2024, earning combined BS and MS degrees in Computer Science.May 24, 2024
• IOI 2019 bronze (rank 208) and IOI 2020 bronze (rank 101, 314.18/600) representing the Philippines; Codeforces handle dsjong links the IOI and CPHallOfFame records.Sep 19, 2020
• Won bronze medal at IMO 2019 representing the Philippines (rank 256/621, 19 points); also an APMO 2019 honourable mention.2019
• Press coverage of his summa cum laude graduation is consistent across Philippine outlets (Ateneo de Manila, GMA, ABS-CBN, Manila Bulletin), all dated May-June 2024 - identity is corroborated by multiple independent publishers, not a single aggregator.Jun 23, 2024
• Software Engineer Intern at Microsoft (Redmond, WA) in 2022, where he introduced autoregressive topic suggestions to Microsoft Viva Topics' topic picker using a deep-learning language model.2022
• Co-authored (as a Yale competitor) entry at ICPC World Finals 2021, ranked 109 - competitive programming continued at collegiate level after IOI.2021
• Ateneo de Manila alumnus (Grade School '14, Junior High '18, Senior High '20); valedictorian of his senior high school batch before Yale.May 24, 2024
• GitHub account dsjong is confirmed as his (profile display name 'Dion Stephan Ong'); repositories include Yale-ICPC-Notebook (fork of the KACTL algorithms library), an Othello engine, and a musl-ringleader fork, consistent with the ICPC and systems profile but showing little recent public activity.Sep 17, 2026