Circuit Ventures built a suite of developer tooling around API testing, schema validation, and team-based workflow automation. Six years of product iteration produced a platform that 680 teams were paying to use monthly when the company folded. The failure wasn't the product — it was a series of pivots chasing enterprise contracts that never materialized, draining the runway that the core SMB product was quietly generating. The codebase is modern, documented, and actively used. The customer base is loyal and vocal on Twitter. The product was left mid-pivot to enterprise and the SMB version is exactly what the market wanted.