Rogério Aristida Guimarães Junior

Brazilian computer scientist and competitive-programming medalist. As a high-school student at Farias Brito he won a silver medal at IOI 2016 (rank 69) and a bronze at IOI 2017 (rank 142) representing Brazil, then earned dual bachelor's degrees at MIT (CS and Engineering; Linguistics and Philosophy) before starting a PhD in Computation and Neural Systems at Caltech in Pietro Perona's vision lab.

Signal

Rogério is a low-volume, low-profile academic poster: his X bio frames him at the intersection of computation/neural systems and CS+linguistics+philosophy, and his public footprint is dominated by academic pages (Google Scholar, ORCID, Caltech/MIT lab pages) rather than social feeds. His most-cited public presence is his research and his old olympiad record, not posting.

Notes12

• Won silver (rank 69) at IOI 2016 and bronze (rank 142) at IOI 2017 for Brazil, confirmed by the official IOI stats database; the CP Hall of Fame profile reproduces the same IOI results and links his Codeforces handle.Aug 1, 2017
• In March 2017, aged 18, he was admitted to MIT and told G1 that by then he had accumulated 25 olympiad medals and dreamed of working with technology for education - he later founded CodCad and presided NOIC, which is that stated ambition executed.Mar 17, 2017
• Public email [contact omitted] and personal site rogeriojr.com are published directly on his IOI stats profile, alongside Codeforces and Twitter links - an unusually open contact footprint for a researcher.Sep 1, 2026
• At MIT he did a dual BSc in Computer Science and Engineering AND Linguistics and Philosophy, then moved into Caltech's Computation and Neural Systems - a deliberate AI/cognitive-science/philosophy-of-mind track, not a pure CS path.Jun 1, 2021
• Work trajectory shows a finance-adjacent detour (Investment Engineer at Bridgewater Associates, Data Science Intern at ZEISS Medical Technology) between MIT and the Caltech PhD, suggesting he tested industry before committing to research.Jun 1, 2021
• His CV lists the diffusion-model project 'Diffusion Models as Pretrained Backbones for Visual Understanding', asserting a research focus on reusing pretrained generative features for discriminative vision tasks.Jan 1, 2024
• Was a Tang Family FinTech Undergraduate Research and Innovation Scholar (SuperUROP, 2019-2020), working with Mardavij Roozbehani on a collaborative-filtering approach to strategy recommendation - an early finance/ML thread later reflected in his Bridgewater role.Sep 1, 2019
• Co-founded CodCad in 2016, a free online platform to teach competitive programming - a direct pay-it-forward move after his own olympiad success.Jan 1, 2016
• Presided NOIC in 2016, a project promoting scientific olympiads in Brazil and democratizing access to them - consistent with his stated goal of using technology for education.Jan 1, 2016
• Google Scholar shows 89 citations, h-index 2, i10-index 1 - modest but nonzero, consistent with an early-career PhD whose main citation cluster dates from 2023 onward.Sep 1, 2026
• Undergraduate projects span NLP (CycleGAN-style tweet style transfer), psycholinguistics (children's quantification), Bayesian few-shot learning, meta-learning (MAML), and a C++ fusion-tree implementation - an unusually broad theoretical/linguistic/ML portfolio for one student.Jan 1, 2020
• Codeforces handle rogerioagjr rates 'Expert' with home city Fortaleza, Brazil - the competitive-programming identity persists online years after the olympiad career.Sep 1, 2026