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, W&B LLM Tracer, Weave, and now ARIA. Before that I ran ML platform products at Twitter and search at Workday.

Work

Selected

Now · Architect & Lead Engineer · CoreWeave

CoreWeave ARIA

An AI research agent for ML teams, now generally available in CoreWeave Forge. It answers plain-language questions about your experiments and results, proposes new hypotheses, and runs the follow-up experiments on cloud GPUs.

Previously · Lead maintainer · Open source

Weights & Biases 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

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