How To Use Devin
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What Devin actually is
Devin by Cognition is a managed autonomous software engineer. You give it a task in Slack, Linear, GitHub, or its own web UI, and it works in its own cloud workspace — planning, editing, running tests, opening PRs — reporting back when it’s done or stuck. It’s the most hands-off coding agent on the market, and it’s priced accordingly.
Setting it up
Devin shines for async, multi-step work. Good fits: dependency bumps, adding telemetry across a codebase, writing migration scripts, filling out test coverage, triaging Sentry errors into PRs. Kick off two or three sessions in parallel from Slack, get a coffee, come back to draft PRs ready for review. Treat each PR like a junior’s work — read the diff, run it locally, and leave review comments. Devin responds to PR comments and pushes fixes the same way a human would.
Your first session
ACU (agent compute unit) burn is the main surprise. A meandering task can eat $10–20 of credits before you notice. Set budget limits in settings and cap session time. Devin is slower per task than running Claude Code locally — you’re paying for the hands-off part, not speed. It also fails quietly on tasks that require ambiguous product decisions; if the “right” answer needs a human call, it will guess and you’ll be rewriting the PR anyway.