Keystone 的 AI 工程师赌注：创始人拒绝收购，开源平台

做的是什么生意

Started as an 'AI on-call engineer', automatically triaging tickets, fixing bugs, and handling production incidents; now Proliferate, offering an MIT-licensed, self-hostable company coding agent platform.

启动资金：Completed a $500,000 seed round in September 2025, with investors including M.G. Siegler, Harrison Metal, Partech, Tekton, The HIT Forge, and Y Combinator.

起因

Pablo Hansen completed a master's degree in AI at age 19 and was the first employee at Onyx (YC W24); he founded Keystone in 2025 and was selected for the YC S25 batch; the company's goal was to use AI to automatically triage tickets, fix bugs, and handle incidents, serving as the team's 'on-call AI engineer'.

经过

At Demo Day in September 2025, TechCrunch listed it as one of the 9 companies investors most wanted to back: customers included Lovable, and the founder said it had turned down a seven-figure acquisition offer; that month it completed a $500,000 seed round. The company later renamed to Proliferate and transformed the product from a closed-source bug-fixing tool into an MIT-licensed, self-hostable coding agent platform, focused on 'company-level background agents': each agent has an isolated sandbox, can access internal services, is triggered by any event, and is collaboratively validated in multi-user real-time preview.

可借鉴之处

先验证窄赌注，再扩张：用客户和收购要约证明 AI 能修 bug，然后开源平台，进入更大战场。