Portrait of Tim Sweeney

Tim
Sweeney

Teaching computers to help people.

Principal Software Engineer at CoreWeave, where I lead CoreWeave ARIA, a research agent for ML teams. I love taking AI products from first prototype to something people use: W&B Model Registry, one of the first LLM trace viewers, Weave, and now ARIA. Before that I ran ML platform products at Twitter and search at Workday. I also enjoy teaching how these systems work.

Work

Selected

Now · Tech lead · CoreWeave

CoreWeave ARIA

An AI research agent for ML teams, now generally available in CoreWeave Forge. Ask questions of your experiments, runs and charts in plain language, and let ARIA propose hypotheses, launch experiments on cloud GPUs, and iterate on the results.

Previously · Lead maintainer · Open source

Weave

Observability and evaluation for production agents. Trace, evaluate and improve AI applications, with sessions, turns and tool calls treated as first-class concepts.

1,000+GitHub stars
790+Dependents
100+Contributors

Built with AI

Side projects
  • Federal Budgeting Tool Claude

    Design tax brackets and a federal spending budget, starting from Milton Friedman's negative income tax.

  • Morley Field Squirrels ChatGPT

    Team page for the Morley Field Squirrels disc golf team.

  • Disc Flight Lab Claude

    A disc golf flight simulator. Pick a disc or set its flight numbers, throw it, and watch the physics of turn and fade from four angles.

Career trace

2011 — now
CoreWeavePrincipal Software Engineer
2025 —
Weights & BiasesPrincipal Software Engineer · acquired by CoreWeave
2020 — 25
Georgia TechM.S. Computer Science, Machine Learning (reinforcement learning)
2018 — 20
TwitterProduct Manager, ML Platform
2018
WorkdayProduct Manager, Search & ML
2015 — 18
Cal PolyB.S. Business Administration, Information Systems; minor in Computer Science
2011 — 15

Writing

Selected