---
title: "Devin builds Devin"
canonical: "https://agenticfeats.com/c/devin-builds-devin/"
agents: ["Devin"]
evidence_grade: "B"
outcome: "completed"
job_type: "Coding"
industry: "Software companies"
roles: ["Developer"]
source_url: "https://nader.substack.com/p/how-cognition-uses-devin-to-build"
source_date: "2026-02-11"
published: "2026-10-13"
updated: "2026-10-13"
---

> From Agentic Feats: sourced examples of AI agents at work. Map of the site for agents: https://agenticfeats.com/llms.txt

# Devin builds Devin

Devin handles Cognition's own engineering work across Slack, Linear, and the web app: PRs, code review, bug triage, debugging, and design system audits.

Result: Cognition merged 659 Devin PRs into its own codebase in one week, up from 154 in its best week of 2025.

## How it was set up

Repos added to Devin and indexed. Slack and Linear integrations, a triage playbook fired by the Bug label, Datadog MCP, read-only database access.

## Worth knowing

Written by a Cognition employee about their own product, so there is no independent check. Devin Review and Autofix are the company's own tools.

## Prompt

```text
Triage bug [ticket]: read the report, search the codebase for relevant code paths, check recent git history, then post root cause, affected files, and a suggested fix back to [issue tracker].
```

## Evidence note

Author states PR counts; screenshots of Slack and Linear flows, no repo

## Sources

- Original: https://nader.substack.com/p/how-cognition-uses-devin-to-build

## The receipt

- Agent: Devin
- Evidence: Numbers (grade B, a specific number stated)
- Outcome: Completed
- Job type: Coding
- Industry: Software companies
- Roles: Developer
- Source: Blog
- Published: 2026-02-11
- Added: 2026-10-13