Which programming language is Meta?
Free Coding Questions Catalog
Boost your coding skills with our essential coding questions catalog. Take a step towards a better tech career now!
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.
TAGS
Coding Interview
Facebook
CONTRIBUTOR
Design Gurus Team
-
GET YOUR FREE
Coding Questions Catalog
Boost your coding skills with our essential coding questions catalog.
Take a step towards a better tech career now!
Explore Answers
Grokking the System Design Interview vs. System Design Primer Comparison
Confused between Grokking the System Design Interview and System Design Primer? Check out the differences based on the structure, depth, hands-on practice, and cost to help beginners choose the best resource.
2779. Maximum Beauty of an Array After Applying Operation - Detailed Explanation
Learn to solve Leetcode 2779. Maximum Beauty of an Array After Applying Operation with multiple approaches.
Should a method that implements an interface method be annotated with @Override?
Related Courses
Grokking the Coding Interview: Patterns for Coding Questions
Grokking the Coding Interview Patterns in Java, Python, JS, C++, C#, and Go. The most comprehensive course with 476 Lessons.

Grokking Modern AI Fundamentals
Master the fundamentals of AI today to lead the tech revolution of tomorrow.
Grokking Data Structures & Algorithms for Coding Interviews
Unlock Coding Interview Success: Dive Deep into Data Structures and Algorithms.
One-Stop Portal For Tech Interviews.
Copyright © 2025 Design Gurus, LLC. All rights reserved.