Gabriel Najmias Lang

CS student at Cambridge (First Class), interested in how math and software get applied to real, high-stakes problems. Last summer at Marshmallow I built ML pricing models on millions of insurance quotes. The technical work was interesting — XGBoost, Snowflake, SageMaker — but what really stuck was something simpler: the right model, trained on the right data, makes better decisions than any human could at scale. A quiet modelling choice upstream quietly moves outcomes for real customers. I've also been through selective programmes at Jane Street, Citadel, and D.E. Shaw — talks, simulated challenges, time with people who think very carefully. Less about the finance and more about seeing what rigorous teams actually look like up close. This summer I'm at Carnegie Mellon as a visiting researcher, working with faculty including the head of the maths department on open problems in Markov chain mixing times and multicolor Ramsey theory. Then Huawei R&D as a GPU research intern, selected

Notes11

• Quant employment verification: UNRESOLVED. No actual quant role or internship is evidenced. The five quant-firm entries on his LinkedIn are all student programmes, not employment: D.E. Shaw 'London Insight Programme' (one of 70 across Europe - networking/discussions), SIG 'Discovery Day' (selective online overview), Jane Street 'FTTP' (one of 70 - forums, trade-floor visits, challenges), Citadel 'Discover Citadel Europe' (one of 80 of 4500 - discussions, networking, quant challenges), Optiver & Cambridge Trading Academy (one of ~5 first-years - market making/options curriculum). His documented internships are Marshmallow (insurtech, ML pricing) and Huawei R&D (GPU research), neither a quant trading firm. Identity is corroborated (LinkedIn name + 3x IMO Costa Rica IMO official), but no quant employment claim can be confirmed or denied from public sources.2026
• Bronze medal at IMO 2023 (Chiba, Japan) with 19 points (rank 279, top 55%); reported as the only Central American medallist and one of six Latin Americans that year.Aug 13, 2023
• Only documented employment internship to date is Pricing Intern at Marshmallow (London insurtech) in 2025 - one of two interns selected - building XGBoost classifiers to predict price-comparison rank placement from 6M+ quotes (XGBoost, Snowflake, SageMaker); an ML/pricing role at a non-quant insurance technology company.2025
• GTF BIG Talent Scholar profile lists him as reading Computer Science at Lucy Cavendish College, University of Cambridge, with 'IMO Bronze 2023' and secondary education at Country Day School (Nord Anglia), Costa Rica - an independent third-party corroboration of the Cambridge and IMO-bronze facts.2025
• Honourable mention at IMO 2024 (Bath, UK) with 15 points (rank 327); official IMO results list him under the full name 'Gabriel Najmias Lang' for Costa Rica.Jul 2024
• Three-time IMO contestant for Costa Rica (2022 rank 469 / 9 pts no award, 2023 bronze, 2024 HM) per the official IMO ranking history for contestant id 31734.Jul 2024
• Summer 2026: visiting applied-maths researcher at Carnegie Mellon University with Prasad Tetali (head of the Mathematics department) on Markov chain mixing times and multicolour Ramsey theory, followed by (or alongside) a Huawei R&D GPU research internship.2026
• Selected for Jane Street FTTP 2025 (one of ~70 across Europe) and Citadel 'Discover Citadel | Citadel Securities: Europe' 2025 (one of 80 of 4500 applicants), both described as student programmes rather than employment.2025
• Selected for Y Combinator Startup School 2026 in San Francisco (hand-picked from 30,000+ applicants; in-person program; $25,000 in AI compute credits) - a cohort program, not an employment role.2026
• Describes his motivation in his own LinkedIn bio as applying maths and software to 'real, high-stakes problems' and, after the Marshmallow pricing internship, the lesson that a well-modelled dataset 'makes better decisions than any human could at scale'; he frames the Jane Street/Citadel/D.E. Shaw programmes as seeing 'what rigorous teams actually look like', explicitly 'less about the finance'.2026
• Named one of ~5 first-years in the Optiver & Cambridge Trading Academy (late 2024), a joint university-firm curriculum covering market making and options theory.2024
• Cambridge Part IB Computer Science group project 2026 (visual programming languages theme) lists 'Gabriel Najmias Lang' among the team, tying the Cambridge CS enrolment to 2026 coursework.2026