Fionn Kimber O'Shea

Mathematics student at St John's College, Cambridge (2024-2027). Three-time winner of the Irish Mathematical Olympiad and member of Ireland's International Mathematical Olympiad team (2022, 2023, 2024).

Notes5

• Quant employment verification: UNRESOLVED. The LinkedIn index lists a current role 'Quantitative Trading' at Jane Street (City of London) beginning 2026-07. This employment is index-derived only: no independent primary source confirms an actual Jane Street role or internship. The only Jane Street links found in open sources are its sponsorship of the Maths Beyond Limits camps and its hosting of the 2nd WEOI (2024) at its London offices (weoi.org), which are competition/sponsorship venues, not employment. Employer classification: Jane Street Capital is a quantitative trading firm / market maker (corroborated by the MBL brochure: 'Jane Street is a quantitative trading firm'). The only role with independent supporting evidence is the Rulebase systems/prompt-engineer position (summer 2025), corroborated by his own LinkedIn post; Rulebase is a Y Combinator-backed fintech AI startup (customer-service automation), NOT a quantitative trading firm. Verdict: UNRESOLVED - the quantitative-trading role rests on index data alone, so actual employment is not confirmed and an incoming/internship status cannot be distinguished from an index artifact. Identity is supported (LinkedIn plus olympiad/press cross-links).
• Candidate seed: LinkedIn profile lists 'Quantitative Trading' at Jane Street (City of London) from 2026-07, alongside Systems & Prompt Engineer at Rulebase (2025), Irish Team Deputy Leader at Irish Math Trust (2024-2025) and Watersports Instructor at Oysterhaven (2023). Index/profile-derived claim, not independently confirmed.
• Rules out Jane Street employment evidence in open sources: the only Jane Street links are its sponsorship of the Maths Beyond Limits/Balkans camps ('Together with our sponsor Jane Street') and hosting of the 2nd WEOI 2024 at its London offices - competition and sponsorship venues, not jobs.Jun 2024
• Jane Street Capital is a quantitative trading firm / market maker, not merely a name containing 'quant' - the MBL brochure states 'Jane Street is a quantitative trading firm'.
• Posted on LinkedIn describing the summer 2025 Rulebase work: analysed the model's output to identify recurring faults and recommend changes, and built a system for complex cases - his own first-person account of the role.Sep 2025
• Rulebase (employer for the summer 2025 systems/prompt-engineer role) is a Y Combinator-backed fintech AI startup automating customer service - a fintech software company, not a quantitative trading or market-making firm.2025