Phoomraphee Luenam

Phoomraphee Luenam is listed as a quantitative researcher at Citadel Securities in Hong Kong on his LinkedIn profile. He represented Thailand at the International Olympiad in Informatics, taking a gold medal in 2014 (rank 24) and a silver medal in 2015 (rank 60). He competed on Codeforces as 'Phoom' (peak rating 2230, Master) and attended TriamUdomSuksa School in Bangkok. He studied at the Hong Kong University of Science and Technology (2015-2019) and, from 2024, is recorded as an MS student at ETH Zurich (2024-2026). He co-authored 'Model Fusion via Retrofitting' (ICML 2026).

Notes8

• Career history as surfaced via a LinkedIn-derived index (index-only, not independently primary-sourced by a third party): Quantitative Research Analyst at Citadel Securities, Hong Kong (2019-2022), then Quantitative Researcher at Citadel Securities (2022-present); and a Software Engineering Intern at Facebook, London (2018).Sep 17, 2026
• Quant employment verification: CONFIRMED. The LinkedIn-derived index lists two genuine quantitative-finance roles at Citadel Securities, Hong Kong — Quantitative Research Analyst (2019-2022) and Quantitative Researcher (2022-present, current) — about seven years there; the person's own LinkedIn profile is the underlying source for those entries (role evidence is index/LinkedIn-derived, not an independent third-party confirmation). Identity is supported: the OpenReview profile links the same LinkedIn URL and lists HKUST (2015-2019) and ETH Zurich (2024-2026), and the IOI statistics profile confirms the same name representing Thailand, matching the Codeforces 'Phoom' handle (Bangkok, TriamUdomSuksa School). Employer classification: Citadel Securities is a global market maker and quantitative electronic trading firm, so the roles qualify as quantitative finance; the earlier Facebook role is a software-engineering internship and does not. No student program, insight day, camp or incoming offer is being counted as employment.Sep 17, 2026
• His roles are at Citadel Securities, a global market maker and electronic trading firm ('technology-driven, next-generation global market maker'), so 'Quantitative Researcher' is a genuine quantitative-finance role, not a company whose name merely contains 'quant'.Sep 17, 2026
• OpenReview profile (joined Nov 2024) lists an MS at ETH Zurich (2024-2026) after an undergraduate degree at HKUST (2015-2019), and links the same LinkedIn URL — cross-linking the academic, competitive-programming and professional records into one identity.Nov 1, 2024
• Co-authored 'Model Fusion via Retrofitting' (ICML 2026) with Andreas Spanopoulos, Amit Sant, Sotiris Anagnostidis, Thomas Hofmann and Sidak Pal Singh — an ETH Zurich machine-learning group paper.May 1, 2026
• HKUST-era research: co-authored 'Approximating Regret Minimizing Sets: A Happiness Perspective' (arXiv 2102.03578, submitted Feb 2021) with Yau Pun Chen and Raymond Chi-Wing Wong, an HKUST database group paper, showing research output bracketing the start of his professional career.Feb 6, 2021
• The 2018 Facebook role is labelled 'Software Engineering Intern' — an engineering internship, not a quantitative-finance position — so it is a work entry but not a quant-finance one.Sep 17, 2026
• arXiv 2507.00037 'Model Fusion via Retrofitting' formalizes model fusion as a neuron-centric representation-matching problem; the authorship is consistent with an ETH Zurich MS research line running in parallel with the Hong Kong quant role.Jul 1, 2025
• IOI record: Thailand contestant with a gold medal at IOI 2014 (rank 24, 449/600) and a silver medal at IOI 2015 (rank 60, 363.55/600); these are Olympiad competition results, not employment.Aug 2, 2015
• Competed on Codeforces as 'Phoom' (Phoomraphee Luenam), peak rating 2230 (Master), listed from TriamUdomSuksa School in Bangkok, Thailand.Sep 17, 2026
• CPHOF, an independent competitive-programming archive, lists the same IOI medal record (2014 gold, 2015 silver) and links Codeforces handle 'Phoom', corroborating the IOI identity with a second archive.Aug 2, 2015
• Index-only: LinkedIn profile shows 162 connections and 166 followers, consistent with a low-visibility research profile rather than a public-facing one.Sep 17, 2026