Lenny's Podcast · May 4Inside Devin: The AI engineer that's set to write 50% of its company’s code this year | Scott Wu
Devin writes about a quarter of Cognition's own pull requests and merges several hundred PRs a month from a team of about 15 engineers, with Wu expecting over half by year end. Each engineer runs up to five Devins at once, stepping in for the 10 to 20% needing human judgment, and usage is priced by ACUs.
Tips
- Hand Devin well-defined tasks, not open-ended problems▶ 48:05Devin shipped a link to Lenny's newsletter on the Devin site as a pull request during the live demo.
- Run several agents asynchronously and step in only for the hard 10 to 20%▶ 30:44Most of Cognition's 15 engineers work with up to five Devins at once, and Devin merges several hundred PRs a month.
- Onboard a new agent like a junior engineer, starting with easy tickets▶ 1:09:41Early users who started with big asks on a blank screen struggled, which shaped Devin's onboarding.
- Seed adoption with a few enthusiasts who set up the agent for everyone▶ 1:07:42This is the pattern Cognition sees repeatedly in the teams that adopt Devin.
- Build stickiness through accumulated knowledge and multiplayer use, not a hard moat▶ 57:30Engineers on the team add context in Slack threads and PR comments, and Devin works it into later changes.
- Use agent-generated codebase wikis to onboard engineers and scope tasks▶ 40:20Demoed on the DeepSeek repo, with Devin Wiki answering a multi-token prediction question by searching the whole codebase.
- Offer separate ask, search and agent modes so users control when work starts▶ 51:10Linear ticket scoping also shows Devin's confidence level before you start a session.
- Frame the agent as a named teammate to make handoff intuitive▶ 18:12The name came from combining each founder's own dev agent, such as DevWalden and DevSteven.
- Treat autonomous agent adoption as an ongoing investment that compounds with each update▶ 1:09:10Cognition's own share of Devin-authored PRs is about a quarter now and grew exponentially internally.
