Alejandro Vivero Puga

Spanish competitive programmer and mathematics student. Represented Spain at the International Olympiad in Informatics in 2023 (Silver, rank 88) and 2024 (Gold, rank 16, Spain's first IOI gold). Studies at CFIS-UPC (Universitat Politecnica de Catalunya) in Barcelona. Organiser and problem-setter for Spanish informatics olympiad activities (OIE committee from 2025, CAMA co-organiser, OIE/Coddii training instructor).

Notes1

• Quant employment verification: UNRESOLVED. Identity is well-supported (Spain IOI 2023/2024, Codeforces Esomer, CFIS-UPC, LinkedIn slug), but the only quantitative-finance employment evidence is index-only: a 'Quant Intern' at an unnamed 'HFT Firm' (Jul-Aug 2025) and a 'First-Year Trading & Technology Programme participant' at Jane Street (Mar-Apr 2025, London), with LinkedIn directory snippets showing the HFT employer only as 'Stealth HFT Firm'. Jane Street is a quantitative trading firm, but its listing is a student programme, which does not qualify as an actual role; the HFT Firm is unnamed and rests on the index alone with no primary source. No named quant employer, no independently corroborated internship, retained as unresolved.Aug 1, 2025
• IOI 2024 (Egypt): gold medal, rank 16 of 353, score 402.16/600 - Spain's first IOI gold, per OIE and Harbour.Space coverage.Sep 6, 2024
• LinkedIn index enrichment lists a 'Quant Intern' role at an unnamed 'HFT Firm', Jul-Aug 2025 - index-only, no named employer and no independent corroboration.Aug 1, 2025
• LinkedIn index enrichment lists 'First-Year Trading & Technology Programme participant at Jane Street', Mar-Apr 2025, London. A student/insight programme, not an employment role; Jane Street is a quantitative trading firm.Apr 1, 2025
• LinkedIn search snippets show a current entry 'Stealth HFT Firm, +1 more', i.e. the high-frequency-trading employer is recorded as stealth/unnamed - consistent with the index-only internship entry but still not a named employer.Aug 1, 2025
• Listed on the OIE committee ('desde 2025') alongside Daniel Nieto and Anier Velasco - an ongoing volunteer/organisational role in Spanish olympiad activity after competing.Jan 1, 2025
• IOI 2023: silver medal, rank 88, score 230/600.Sep 4, 2023
• Codeforces handle 'Esomer', title 'Master', location Barcelona - ties the olympiad identity to the competitive-programming account.Jan 1, 2024
• Named as organiser/executive member and problem setter of CAMA (Competicion Amateur en Matematicas y Algoritmia), a Spanish student-run maths/algorithms competition.Jan 1, 2024
• Named as a teacher/instructor in the OIE free C++/algorithms training programme (Coddii).Sep 30, 2024
• Credited in the OIE 2024 solution editorial for the 100-point solution to the 'Adivina' task (Final Day 1).Apr 1, 2024
• Top of the OIE 2024 classification (682.41 pts) ahead of Badesa (658.76) and Nieto - strongest Spanish contestant that year before the IOI gold.Apr 1, 2024