# Duo Culture

> Build the team the way Duolingo built theirs — the Green Machine operating model, talent density over headcount, candor protocol ("focus on what, not who"), hire-slow / fire-fast, and the "no process unless it makes decisions better" rule. Use when the user is hiring, defining team rituals, debating remote vs. office, choosing a feedback model, or installing an operating system in a team that has none. Source the Duolingo Handbook (Raise the Bar + Green Machine).

- Skill: `hktitan/duo-culture` (Agent Skill, multi-file: 11 files)
- Install (CLI): `npx skillmds@latest add hktitan/duo-culture`
- Raw SKILL.md: https://api.skillmd.com/api/skills/hktitan/duo-culture/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: AI & ML
- License: MIT
- Author: HKTITAN (https://skillmd.com/u/hktitan)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/hktitan/duo-culture

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# Duolingo Culture — Map of Content

The handbook treats culture as load-bearing, not aspirational. Two principles (*Raise the Bar*, *Ship It*) and one operating model (*The Green Machine*) describe how Duolingo decides who to hire, how to run a team, and when to add process. This skill packages the operating manual.

This skill is structured as a **graph**: scan the descriptions below, follow only the `[[wikilinks]]` you need.

## The operating model

- [[references/green-machine]] — the six-step build/measure/learn loop Duolingo runs the company on.
- [[references/clock-speed]] — minimizing the gap between steps; the company-wide tempo metric.

## Talent

- [[references/talent-density]] — "better a hole than a hire that lowers the bar."
- [[references/hire-slow-fire-fast]] — the protocol for both directions.
- [[references/candor-what-not-who]] — feedback rule that lets criticism survive at scale.

## Process

- [[references/no-process-without-purpose]] — process is a tax; only add it if it improves decisions.
- [[references/ownership-clarity-culture]] — every critical task has one owner; this is a culture rule, not a project-management rule.
- [[references/async-vs-meetings]] — when to converge in real time and when to commit to writing.

## Identity

- [[references/quirky-by-design]] — the office, the rituals, the brand voice as recruiting and retention tools.
- [[references/dogfooding-culture]] — the cultural commitment behind the product practice.

## Sibling skills

- [[../duo-product/SKILL]] — *Raise the Bar* and *Ship It* are the same principles seen from the product side.
- [[../duo-experimentation/SKILL]] — experimentation only survives in a culture where being wrong is cheap.
- [[../duo-voice/SKILL]] — the brand voice is a hiring filter; the people who write it are the people who get the joke.

## Sources

- Duolingo Handbook (2025), Principles #2 *Raise the Bar*, #3 *Ship It*, and *The Green Machine*