Fran Babić

Fran Babić is a Croatian mathematics undergraduate and competitive-programming medalist. He represented Croatia at the International Olympiad in Informatics (IOI) 2023 in Szeged, Hungary, scoring 217/600 (rank 98) and earning a bronze medal, and holds a silver and a bronze from the European Junior Olympiad in Informatics (EJOI), where he returned as Croatia's Deputy Leader in 2024. He studied at XV. gimnazija in Zagreb (2019-2023) and is pursuing a Bachelor's degree in Mathematics at the Department of Mathematics, University of Zagreb (2023-2026). His public professional record is concentrated in quantitative trading: Software Engineer at Citadel Securities (London, 2025) and Quantitative Researcher at Jump Trading (Jun 2026 - present). He has also served on Croatia's national scientific committee for the informatics competition (AZOO, 2023-2024).

Notes7

• Quant employment verification: CONFIRMED. Fran Babić (identity: IOI 2023 Croatia contestant and BSc Mathematics student at the University of Zagreb, LinkedIn fran-babić-425a25324; corroborated by IOI teammate Toni Brajko also appearing at Jump Trading) holds two roles at established quantitative trading firms. (1) Software Engineer, Citadel Securities, London Area, 2025 - Citadel Securities is a global electronic market maker, a quantitative-trading employer; the role appears on his LinkedIn (index), published as an actual role, though the index shows the year only. (2) Quantitative Researcher, Jump Trading, Jun 2026 - Present - Jump Trading is a proprietary high-frequency/algorithmic trading firm; this is the current role and is an actual, not student-program, position. Employer classification is based on each firm's own business (market making/HFT), not on the word 'quant'. No student insight-day/camp/scholarship-only entry was counted as employment. Both roles are self-reported on LinkedIn rather than via an independent third-party report, and no exact start/end dates beyond what LinkedIn shows were independently verified.Sep 17, 2026
• Current role (LinkedIn): Quantitative Researcher at Jump Trading, Jun 2026 - Present (4 months), based Zagreb/Velika Gorica, Croatia.Sep 17, 2026
• Jump Trading is a proprietary high-frequency/algorithmic trading firm (its own site describes traders, builders, and researchers powering global trading), so the Quantitative Researcher role is a genuine quantitative-finance role, not a software role at a tech company.2026
• Both quant employers (Citadel Securities, then Jump Trading) sit in the same London/quant-trading market-making and HFT space; the move from a 2025 Citadel Securities placement to a 2026 Jump Trading researcher role is a continuous, and still undergraduate, path through quant trading firms.Sep 17, 2026
• Prior role (LinkedIn index): Software Engineer at Citadel Securities, London Area, 2025. Citadel Securities is a global electronic market maker, so this is a quantitative-trading employer; the caller-supplied exact window Jun-Sep 2025 is consistent with a summer internship but the index shows the year only, so role type is not independently confirmed.2025
• Identity corroboration: IOI 2023 Croatia teammate Toni Brajko also shows Jump Trading on LinkedIn, which ties the Jump Trading 'Fran Babić' to the same Croatian Olympiad cohort (cohort overlap noted only as an identity signal, not a cause).2026
• IOI 2023 (Szeged, Hungary; 28 Aug - 4 Sep 2023): represented Croatia as HRV1, scored 217/600, ranked 98, bronze medal.Sep 4, 2023
• EJOI: Croatia contestant with 1 silver and 1 bronze medal, and returned as Croatia's Deputy Leader at EJOI 2024.2024
• Education: Bachelor's degree in Mathematics, Department of Mathematics, University of Zagreb, 2023-2026 (index dates).2023
• Volunteer/membership role: Member of the National Scientific Committee for the National Competition in Informatics, Agency for Education and Teacher Training (AZOO), Croatia, 2023-2024.2023
• Codeforces handle fbabic; CP Hall of Fame profile mirrors his IOI 2023 bronze (rank 98, score 217) and links his Codeforces and IOI profiles.2023
• Secondary school: XV. gimnazija (Zagreb), 2019-2023, a math/informatics-focused gymnasium.2019