Tessl

Tessl develops an AI-native development platform that enables teams to define functionality with specifications and have AI generate, maintain, and test code across languages. Its agent-centric tooling supports spec-driven development and aims to keep software aligned with evolving dependencies, reducing integration errors. Based in London, Tessl has raised funding from Index Ventures, Google Ventures, Accel, and Boldstart, with a Series A in 2024 and a multi-hundred-million valuation.