Raphael Henrique Ribas

Raphael Henrique Ribas is a Brazilian software engineer and competitive programmer. He represented Brazil at the International Olympiad in Informatics in 2004 and 2005, winning a bronze medal both years, and later reached the ICPC World Finals (2009, 2010) with the UFPR team 'Triforce'. Per his LinkedIn index record he studied at Universidade Federal do Paraná (2005-2009) and is associated with USP - Universidade de São Paulo. In October 2019 he was a named co-author on OpenAI's 'Solving Rubik's Cube with a Robot Hand' reinforcement-learning paper. His LinkedIn profile lists him as a Software Engineer at Jane Street, a quantitative trading firm, in New York, from 2019 onward.

Notes7

• Quant employment verification: CONFIRMED. LinkedIn profile (index-reported, https://linkedin.com/in/raphael-ribas) lists Software Engineer at Jane Street, New York, 2019-present; Jane Street is a quantitative proprietary-trading firm and market maker, so this is an actual engineering role at a quantitative trading firm, not a student program or competition. Identity is supported by multiple signals: the same record matches the IOI 2004/2005 bronze-medal competitor's name and Brazilian education (UFPR 2005-2009) and competitive-programming achievements, and a primary-source arXiv paper (OpenAI, Oct 2019) lists Raphael Ribas, matching the record's OpenAI past role. Caveat: the Jane Street role itself rests on the self-reported LinkedIn profile mirrored by aggregators, i.e. index/aggregator evidence, not an independent Jane Street primary-source confirmation.2019
• 'Software Engineer at Jane Street' (New York), 2019-present per the LinkedIn index record; Jane Street is a quantitative proprietary-trading firm and market maker, so this is employment at a quantitative trading firm rather than a student or competition program.2019
• Co-author on OpenAI's 'Solving Rubik's Cube with a Robot Hand' (arXiv 1910.07113, submitted 16 Oct 2019), a dexterous-manipulation reinforcement-learning paper; this primary-source authorship corroborates the OpenAI role listed in his LinkedIn index record.Oct 16, 2019
• Identity spanning the IOI roster person (Raphael Henrique Ribas, Brazil) and the engineer rests on multiple independent signals: matching name, IOI/ICPC/Code Jam competitive record mirrored in the LinkedIn index, Brazilian university education, and OpenAI paper authorship.2019
• Won a bronze medal for Brazil at IOI 2004 (rank 115/291, score 300) and again at IOI 2005 (rank 92/276, score 351) as a high-school competitor, per the official IOI statistics database.2005
• Competitive-programming record spans 2004-2010 on the CPHOF profile: IOI bronze medals 2004 and 2005, Google Code Jam 2008 qualification, and ICPC World Finals in 2009 (rank 41) and 2010 (rank 30).2010
• Competed as part of the UFPR team 'Triforce' formed by brothers Bruno, Eduardo and Raphael Ribas; the three were C3SL (Centro de Computação Científica e Software Livre) scholarship holders, took 2nd at the Brazilian 2008 final and advanced to the ICPC world final in Stockholm (April 2009).Dec 3, 2008
• The Jane Street role appears in LinkedIn-derived aggregators too (e.g. ZoomInfo 'Raphael Ribas - Software Engineer at Jane Street'), but aggregators mirror the same self-reported profile, so they are not independent confirmation of the role.2026
• LinkedIn index record lists a past role tied to openai.com (San Francisco Bay Area) before the current Jane Street role, consistent with the Oct 2019 OpenAI paper authorship; index-only, no dates given.2019
• OpenAI (paper Oct 2019) and Jane Street (index start 2019) are adjacent in time, which suggests a 2019 move from OpenAI robotics/RL research to Jane Street; both are index/primary-source dated independently.2019
• The 2004-2005 IOI appearances, the UFPR 2005-2009 enrollment, and the 2009-2010 ICPC World Finals appearances form one continuous competitive-programming timeline that lines up with a single person who then moved into industry ML/trading engineering.2010
• Linked to the C3SL open-source chess-server project (chessd, an XMPP chess daemon with a web client) around 2008: named on the SBGames 2008 short paper 'Arquitetura de Servidor de Xadrez sobre XMPP com Cliente Web' and the git.c3sl.ufpr.br/chessd repository.2008