What IDE is used at Meta?

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At Meta (formerly Facebook), developers have flexibility in choosing their development environment, so there isn’t a single Integrated Development Environment (IDE) that is mandated across the company. However, several tools and IDEs are commonly used by developers, depending on their role, team, and personal preferences.

Common IDEs and Tools Used at Meta:

1. Visual Studio Code (VS Code)

Why it's popular: VS Code is a lightweight, highly customizable code editor developed by Microsoft. It is widely used across tech companies, including Meta, because of its extensive library of plugins, speed, and support for a wide range of programming languages (e.g., Hack, JavaScript, Python, etc.).
Usage: Meta engineers use VS Code for web development, JavaScript, and front-end work, as well as backend tasks that involve Hack (Meta’s PHP-based language).

Source: VS Code Documentation

2. JetBrains IDEs (IntelliJ IDEA, PyCharm, CLion)

Why it's popular: JetBrains IDEs, such as IntelliJ IDEA (for Java), PyCharm (for Python), and CLion (for C++), are popular for their deep integration with specific languages, strong code refactoring features, and support for large projects.
Usage: Developers working with Java, Python, or C++ at Meta might use these IDEs because of their powerful debugging and refactoring tools.

Source: JetBrains Products

3. Internal Tools

Meta's Internal IDEs: Meta has built proprietary tools and environments tailored to its engineering needs. For example, engineers use internal build systems, linters, and debuggers that are highly customized for Meta’s large-scale infrastructure.
Usage: For internal languages like Hack (a PHP derivative), Meta likely has specialized plugins or internal tools that are used alongside more general IDEs like VS Code or JetBrains IDEs.

Source: Meta Engineering Blog

4. Vim and Emacs

Why it's popular: Some developers prefer lightweight text editors like Vim or Emacs for their speed and keyboard-centric workflow. These editors are especially popular among engineers who value productivity and flexibility in highly customized development environments.
Usage: Some engineers at Meta, particularly those who prefer minimalistic setups or work on infrastructure and backend systems, use these editors.

Source: Vim Documentation | Emacs Documentation

Conclusion:

Meta developers commonly use VS Code, JetBrains IDEs (IntelliJ IDEA, PyCharm, etc.), and occasionally Vim or Emacs. In addition, Meta has internal tools that support its custom infrastructure and coding languages like Hack. The choice of IDE often depends on the developer's role, personal preferences, and the specific project.

Sources: