Which programming language is Meta?

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Meta (formerly Facebook) uses a variety of programming languages across its platforms, products, and services. The most prominent languages include:

1. PHP (Hack)

Core Language: Facebook was originally built in PHP. Over time, the company developed Hack, a programming language that builds on PHP, adding features like static typing and other performance improvements.
Usage: Facebook’s core backend infrastructure still relies heavily on Hack, especially for its web-based applications and services.
Source: Hack: Programming Language

2. C++

Usage: Meta uses C++ for high-performance applications and backend systems, especially where efficiency and performance are crucial, such as in the news feed, messenger, and infrastructure services.
Source: Meta Engineering

3. Python

Usage: Python is commonly used for data science, machine learning, and automation tasks within Meta. It’s also employed in some backend services and for tooling.
Source: Python at Meta

4. Java

Usage: Java is used for backend services, particularly in handling large-scale systems and distributed computing.
Source: Facebook Careers: Engineering Languages

5. JavaScript (React)

Usage: Meta is heavily invested in JavaScript for front-end development, particularly through React, a JavaScript library that Meta developed and open-sourced. It powers the user interfaces for Facebook and Instagram.
Source: React.js - Facebook Open Source

6. Objective-C and Swift

Usage: Meta uses Objective-C and Swift for developing its iOS applications, such as Facebook, Messenger, and Instagram.
Source: Facebook iOS Development

Meta uses a diverse range of programming languages depending on the product or system. For example, Hack and C++ are used for backend systems, while Python, JavaScript, and Swift are used for data, front-end, and mobile app development.

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