Planting the future

Cohere partnered with Fern to transform their SDK development from manual TypeScript and Go implementations to automated generation. By centralizing their API spec and leveraging Fern's language-specific code generation, Cohere eliminated SDK maintenance overhead while delivering idiomatic features like TypeScript's discriminated unions and Go's context primitives, reducing GitHub issue resolution time from months to days.

Merge streamlined their SDK development by switching from OpenAPI to Fern, enabling cleaner APIs and automated workflows across six programming languages. The rapid 4-week implementation delivered enhanced documentation and compatibility, earning praise from developers for its simplified integration process.

Today we’re announcing our $9M Series A, led by Bessemer Venture Partners with participation from Y Combinator, bringing our total funding to $13M.

Fern transforms API development at Candid by centralizing API definitions in YAML and automating code generation. This eliminates manual boilerplate across backend (95,000 lines) and frontend (30,000 lines), ensuring consistency between Pydantic models, FastAPI routes, TypeScript clients, and upcoming documentation. The schema-first approach prevents drift bugs through a single source of truth, with plans to extend into customer-facing SDKs.