Kastan Day
Senior Machine Learning Engineer at Cloudflare
Seattle, Washington, United States
Summary
👤
Senior🎓
Top SchoolKastan Day is a Senior Software Engineer specializing in HPC, AI, and distributed machine learning with nine years of experience building scalable systems for scientific and industrial workloads. Based in Seattle, he has led teams and engineered solutions that run petabytes of data across hundreds of GPUs and 200-gig networks, with notable work in distributed training and inference for climate and physical simulation. His background spans research and industry—contributions at NCSA, IBM Research, and Rescale—where he blends model design with low-level systems engineering to optimize parallelism, networking, and memory bandwidth. A founder-turned-researcher, he also shipped wearable-driven health products and produced high-impact robotics and vision prototypes at NASA, showing a pattern of translating research into production. Beyond code, he’s an outdoors enthusiast who focuses on parallel and distributed ML tooling (see github.com/kday-rescale), and he emphasizes scientific rigor by supervising processes rather than outcomes.
9 years of coding experience
7 years of employment as a software developer
Bachelor's of Arts Computer Science & Cognitive Science, Bachelor's of Arts Computer Science & Cognitive Science at Swarthmore CollegeCardigan Mountain SchoolMaster of Science - MS Computer Science, Master of Science - MS Computer Science at University of Illinois Urbana-ChampaignHigh school, High school at Phillips Academy
Github Skills (200)
llama10
llm10
python10
audio10
gemini10
machine-learning10
large-language-models10
openai10
optimization10
chatgpt10
duplicate-detection10
generative-ai10
ai10
mistral10
ollama10
Programming languages (15)
Github contributions (5)
Center-for-AI-Innovation/ai-ta-backend
May 2023 - Apr 2025
API backend for UIUC AI Teaching Assistant.
Contributions:122 reviews, 176 PRs, 841 pushes in 1 year 11 months
aibackendchatbotllm
Center-for-AI-Innovation/uiuc-chat-frontend
May 2023 - Apr 2025
Chat with your documents. Upload anything, get answers.
Contributions:88 reviews, 257 PRs, 1228 pushes in 1 year 11 months
Find and Hire Top DevelopersWe’ve analyzed the programming source code of over 60 million software developers on GitHub and scored them by 50,000 skills. Sign-up on Prog,AI to search for software developers.