- Joined
- Aug 2026
- How they joined
- Directly
- Before Cognition
- Google DeepMindResearch Engineer
- Status
- Current
- Joined Cognition (maker of Devin and Devin Desktop, formerly Windsurf) as Member of Technical Staff in Aug 2026, based in Singapore; it is the latest in a run of short AI stints (xAI, ZeroEntropy, Tilde Research, Google DeepMind) inside two years.Aug 2026
- Member of NUS ICPC team Strong Zero with IOI gold medallists Yuto Watanabe and Tan Si Jie, coached by Dr Eldon Chung; the team won the 2025 ICPC Asia Yokohama Regional, NUS's first ICPC regional win in Japan, three weeks after also winning the ICPC Taiwan regional.Dec 2025
- Co-authored the ZeroEntropy paper 'zELO: ELO-inspired Training Method for Rerankers and Embedding Models' (arXiv:2509.12541) with Nicholas Pipitone, Ghita Houir Alami, Advaith Avadhanam and Anton Kaminskyi - the founders and core team of ZeroEntropy.Sep 16, 2025
- Summer 2025 Research Engineer at ZeroEntropy (YC W25), the AI search/reranker startup; co-founder Ghita Houir Alami announced him as 'the 20 yo 2x Gold IOI medalist who just joined ZeroEntropy (YC W25) for the summer', saying he shipped code on day 1 and proposed new research on day 2.May 2025
- IOI coach at NUS (May-Aug 2025), training Singapore's IOI 2025 team to 2 Gold and 2 Silver; earlier a December competitive-programming trainer at NUS (2019-2022), head trainer in 2022.May 2025
- IOI record (as Ashley Aragorn Khoo): IOI 2020 Silver (rank 36), IOI 2021 Gold (rank 8), IOI 2022 Gold (rank 15, 483.89/600).Aug 15, 2022
- Codeforces handle errorgorn: Legendary Grandmaster, max rating 3119, contribution +122, 33 blog entries; a 2025 interview noted he had the highest contribution score on the platform.
- Listed as a judge at JEVATHON (San Francisco, co-hosted by GMI Cloud, TypeSafe AI and The AI Collective at CodeRabbit's office) with the title 'Member of Technical Staff, Cognition' - his most recent public appearance under the Cognition banner.Sep 26, 2026
- Research Engineer at Google DeepMind in Singapore from Feb to Jun 2026, immediately before Cognition.Feb 2026
- Enrolled in Computer Science at NUS from Aug 2025 and left in Nov 2025 (LinkedIn: "dropped out lol"), the month before joining Tilde Research.Nov 2025
- Cognition signed a definitive agreement to acquire Windsurf (the agentic IDE, from Codeium), including its IP, product, trademark and brand; Khoo joined after the deal, so the Windsurf/Devin Desktop line is acquired product rather than a team he came in through.Jul 2025
- IOI 2022 Team Singapore: errorgorn (Ashley Aragorn Khoo), tqbfjotld (Tan Si Jie), dantoh (Daniel Toh Jing En), joelau (Joel Au Heng Hoi).2022
Trained the IOI team that achieved 2 Gold and 2 Silver
Building the future of Search
slopping for elon
Awards: - Best Airman of the Month (November 2023) - Commander DAG Coin (May 2024) - NDP Star Award (July 2024) Commanders blocked me from going RAiD because they decided that I could contribute better to the country by playing phone all day. Majulah
dropped out lol
https://t.co/YTInqhXPDb I guess this article is cool but it really gives me the impression that the author doesn't understand what he is doing (esp the input gen section) and is written entirely by haiku
Juxtaposition https://t.co/OSQEAwPAxR
CHINESE SAUCE https://t.co/q9lQmwkbJG
20辛挑戰失敗 https://t.co/pzh5puJi3A
@e869120 ありがとうございます😭 https://t.co/nEByWUplxU
silly momen https://t.co/t1uUVly5di
No Japanese lol https://t.co/g4LVaXO2ae
残念 https://t.co/gRWkMoQz1r
Shotuout to Poland https://t.co/QYZKNOe0SE
Singapore competitive programmers... How is it possible to sing this https://t.co/2790HZa7bW
OCPC prize https://t.co/MyL7hHsryA
A - i tried alot of nonsense. Then had faint memory that 1/7,2/7,...,6/7 was like cyclic shift of each other. Then realized we had to do 1/x stuff like 90 mins in contest... Then tried B (more solves). Didnt make much progress interesting contest experience...
