Timothy Feng

Pushing the frontier of open-source LLM inference. Top-down performance engineering. Interested in building cool things. Former competitive coder.

Notes8

• Quant employment verification: CONFIRMED. The index (LinkedIn-derived) record lists a Software Engineer Intern role at Jane Street (janestreet.com) in 2024, located in Manhattan, New York, with technical work on a version-control rebasing service and a client API. Jane Street is a proprietary quantitative trading firm and market maker, so this is an actual internship at a quantitative-trading employer. Identity is supported: the LinkedIn headline '2x IOI Gold Medalist' matches the IOI identity. Caveat: the role is index-only (LinkedIn-derived) evidence, not confirmed by an independent primary source such as the employer.Jun 1, 2024
• His LinkedIn headline reads 'Inference Engineer @ Modal | MIT CS '26 | 2x IOI Gold Medalist', independently corroborating the IOI identity (two gold medals) and linking it to the linkedin.com/in/timmyfeng profile and MIT.Aug 18, 2026
• Represented the United States at the International Olympiad in Informatics (IOI) in both 2021 and 2022, winning a gold medal each year, per the official IOI statistics registry.Aug 15, 2022
• IOI 2022: gold medal, absolute rank 8 of 349 with a score of 520/600; IOI 2021: gold medal, rank 17 with 414/600. Two top-20 worldwide finishes in consecutive years is the strongest single anchor tying the name 'Timothy Feng' to the USA IOI identity.Aug 15, 2022
• Index (local LinkedIn-derived) record lists current role: Member of Technical Staff at Modal (modal.com), San Francisco, 2025-present, engineering department; this is an index-only claim, not independently primary-source confirmed.Jan 1, 2025
• Career timeline assembled from the index: ML Intern at Genesis Therapeutics (2023) -> Software Engineer Intern at Jane Street (2024) -> MIT 6.106 TA (2024) -> Research Intern at Together AI (2025) -> Member of Technical Staff at Modal (2025-present). All are index-only (LinkedIn-derived) claims; none is independently primary-source confirmed.Jan 1, 2025
• No quantitative-finance role other than the 2024 Jane Street software-engineering internship surfaced in the index or in web searches; other employers (Modal, Together AI, Genesis Therapeutics) operate in AI infrastructure and biotech, not trading.
• Education: Bachelor of Science in Computer Science and Engineering, Massachusetts Institute of Technology, 2022-2025 (index record gives a 3-year span).Jun 1, 2025
• A Modal LinkedIn post announced welcoming 'Emily Han and Timothy Feng' to the company, consistent with the index record that he joined Modal; the post is employer-authored.Jan 1, 2025
• Together AI (together.xyz), Research Intern, 2025 (San Francisco): developed a fused multi-LoRA kernel in ThunderKittens for serving LLM LoRAs, and fused split-K kernels with thread-block-cluster reduction. Together AI is an AI-cloud/GPU-inference company, not a quantitative-finance employer.Jan 1, 2025
• Recent public technical work centers on Blackwell-era LLM inference: Modal published engineering posts on reverse-engineering Flash-Attention 4 and on host-overhead in inference, the area his headline/current role name; this contextualizes the Modal role but authorship of those specific posts is not confirmed here.Sep 1, 2025
• MIT 6.106 (Software Performance Engineering) Teaching Assistant in 2024: organized and mentored a high-performance C-programming class and developed a cross-platform student software VM.Sep 1, 2024