Cosine
ActiveFully Agentic SWE
This company has previously operated under “Buildt”. A rename frequently marks a pivot in positioning or product — useful raw material for variant ideas.
About
Cosine is a fully agentic SWE that allows you to instantly work on every single ticket at once, asynchronously.
Founders · 2
Full-stack Software Engineer with 15 years experience with deep applied knowledge of LLMs and Embeddings. Currently building an AI dev tool. Experienced an exit with Fancy (YC S20, acq. GoPuff).
1 IPO, 2 Acquisitions, 3 Unicorns. Ex VP of Europe for Digital Currency Group's consumer arm, Luno. Launched Ziglu (acquired by Robinhood) and scaled to 100,000 customers in the first year. Previously Commercial Director for Mobike (acquired by Meituan) growing it to 220M MAUs until the $55B IPO. Yang is one of the 2021 Forbes 30 under 30 cohort.
Launch
(use your existing Claude, OpenAI, Copilot subscription)
Cosine 3.0 provides a coding agent across CLI, VS Code, desktop, and cloud to handle longer, multi-threaded tasks with better visibility, traceability, and handoff between team members. It aims to maintain context, allow multi-threaded work, and support clean undo and follow-through of changes across environments.
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