Andrii Stolitnii

IOI 2023 silver medalist for Ukraine; BSc Theoretical Computer Science student at Jagiellonian University (2023-2026). Software Engineer at Ethflow, a proprietary crypto algorithmic-trading firm (Oct 2024-Jun 2026), now Software Engineer / SRE at Google Warsaw on Vertex AI (since July 2026). Codeforces Candidate Master (max Master 2177); BOI 2023 bronze medalist; member of the Scientific Committee of the Ukrainian Federation of Olympiad Programming.

Notes13

• Quant employment verification: CONFIRMED. Andrii Stolitnii held an actual paid Software Engineer role at Ethflow, Warsaw, from October 2024 to June 2026 (LinkedIn dates; corroborated by Ethflow colleagues describing the firm as a 'private trading firm' and by Ethflow's own site and Codeforces post identifying it as a proprietary crypto algorithmic-trading fund). Ethflow is verified as operating in quantitative/algorithmic trading, not merely carrying a 'quant' name. The other two quant-adjacent leads are NOT employment: 'Discover Citadel | Citadel Securities 2024' and Jane Street's 'First-year Trading and Technology Program' (both 2024) are student programs/competitions, not roles or internships. Identity is supported by IOI 2023 records, his Codeforces handle, and his Jagiellonian enrollment. His current role (Google, since July 2026) is outside quant finance.Sep 17, 2026
• Software Engineer / Site Reliability Engineer at Google (Warsaw) since July 2026, working on Vertex AI, per his own LinkedIn post; LinkedIn index shows the same role starting 2026.Jul 2026
• Software Engineer at Ethflow, Warsaw, October 2024 - June 2026 (per his LinkedIn), building high-performance applications integrating lending protocols and DEXes on L1 and L2 blockchains.Oct 2024
• Identified as Andrii Stolitnii, handle 'welleyth' (Codeforces/AtCoder), IOI 2023 Ukraine contestant who placed 68th with 248/600 for silver; this matches the IOI statistics profile, cphof profile, and the Ukrainian olympiad federation announcement naming him.Sep 4, 2023
• Ethflow is a proprietary cryptocurrency trading firm - its own site ('Proprietary trading and software development firm... develop proprietary trading algorithms for crypto markets') and its Codeforces announcement ('proprietary trading fund, specializing in cryptocurrency trading') confirm it actually operates in algorithmic/quantitative trading, not merely a name containing 'quant'.
• LinkedIn headline 'IOI Silver Medalist | SWE @ Google | TCS @ Jagiellonian University' and location Krakow/Warsaw confirm the identity is the same person across LinkedIn and competitive-programming accounts.
• Ethflow operates in crypto/DeFi algorithmic trading (its own site lists Ethereum, Kubernetes, Terraform and proprietary trading algorithms), which places his 2024-2026 Software Engineer role inside a quantitative/algorithmic trading firm, though the role is software engineering rather than a trading/strategy seat.
• 'Discover Citadel | Citadel Securities 2024' on his LinkedIn (London) is a student/insight program; he was 'Winner of competition of algorithmic trading using python bot' there - a competition win, not an employment or internship.2024
• 'First-year Trading and Technology Program' at Jane Street (London, 2024) on his LinkedIn is a first-year student program, not a role or internship; Jane Street is a proprietary market-making firm, so it is a quant-firm student program rather than employment.2024
• Serves on the Scientific Committee of the Ukrainian Federation of Olympiad Programming (2024-) and as a problemsetter (2023-); the Ukrainian EJOI/Junior Olympiad 2026 Scientific Committee also lists him - ongoing community involvement, unpaid olympiad work.2026
• Won bronze at BOI 2023 with 210 points (90+120) for Ukraine, per the official Balkan Olympiad results page.2023
• Studies Theoretical Computer Science (BSc) at Jagiellonian University, Krakow, 2023-2026, and is named by the university's 'Per aspera ad astra' international-student support project, corroborating the enrollment beyond the LinkedIn index.