Is Java used at Meta?

Yes, Java is used at Meta (formerly Facebook), especially for backend services and distributed systems. Java's strengths in building scalable, high-performance applications make it a good fit for certain systems at Meta.

Key Uses of Java at Meta:

1. Backend Services:

   • Meta uses Java to power large-scale backend services, particularly for systems that require scalability, concurrency, and high availability.
   • Java’s performance characteristics make it suitable for handling Meta's vast infrastructure and distributed computing needs.

2. Data Processing and Distributed Systems:

   • Java is frequently used in distributed systems within Meta to manage large-scale data processing and real-time services. For example, Java is often applied in systems dealing with large volumes of user data.

3. Internal Tools:

   • Meta also uses Java for building internal tools that manage infrastructure, automation, and data storage, leveraging the robustness of Java for long-running, scalable services.

Example Technologies:

• Meta’s backend engineers often work with Java alongside other languages such as C++, Hack, and Python, depending on the specific needs of the service or system.
• The use of Java is often tied to distributed systems and big data applications where performance, reliability, and scalability are key concerns.

Sources:

• Glassdoor Meta Engineering Reviews
• Meta Engineering Blog