Weave (workweave.dev), a startup backed by Y Combinator (Winter 2025 batch, San Francisco, roughly five people), presents itself with a tight pitch: "AI to understand engineering work". The YC directory page, supplemented by the official launch post ("Weave: AI to quantify engineering work"), describes a B2B analytics platform that uses AI to measure software engineering work in the age of AI.

The problem

Measuring engineering work has historically been nearly impossible: leaders operate blind, and teams rely on intuition or rough metrics to understand what is happening and identify where to improve. This observation motivated the creation of Weave.

The solution

Weave runs LLMs and proprietary models on every pull request and every code review, analyzing both output and quality. The platform integrates with all AI coding tools (Claude, Cursor, etc.) and provides code attribution at the PR level: determining what was written by AI, what was not, and what should have been. This data and these insights are synthesized into dashboards. According to the YC page, teams such as Reducto, Superpower, and Laurel ship 16% more just two months after adopting Weave.

AI Usage and AI Insights

The "AI Usage" section shows who the team's top AI users are (so they can share best practices), how the team compares against competitors, and the real financial return on AI investments. The "AI Insights" section keeps teams informed of the best practices and tools used by the most advanced AI teams.

The Weave Hour

The key metric is not a lines-of-code counter but the "Weave Hour": an estimate of the time an experienced engineer would take to make the change. Weave can also indicate how much time each engineer spends on code.

The founders

The founding team brings a solid pedigree: Adam Cohen (co-founder and CEO) and Andrew Churchill (co-founder and CTO), former employee #1 at Causal — where he built the spreadsheet interface, the access control system, and the AI onboarding engine — after a CS + mathematics track at MIT.

Consistency note

The fiche's historical title refers to a team communication product ("The Loom of AI Team Communication"), but the Y Combinator page archived in raw-data unambiguously describes a product for measuring engineering work: the company's positioning likely pivoted, or the fiche's original title was mistaken. The summary and knowledge graph below reflect the content actually present on the archived YC page.