Signal A funded startup builds measurement of AI-written code into the engineering workflow

Summary

Software development is where the measurement of AI agents is becoming systematic first. Coding is one of the heaviest areas of agent use and spending, which makes it a natural place to prove impact. CB Insights highlights Span, a software engineering analytics company that in September 2025 launched a proprietary model detecting AI-generated code at the level of individual chunks. The tool follows that code through the development lifecycle instead of relying on vendor data or surveys. Span raised 25 million dollars in a Series A round to deepen its ability to measure the return on AI-augmented development. The goal is to answer complex engineering questions in seconds rather than days.