Primary Languages: Java and Apex
Salesforce's core platform runs on Java. The application servers and most backend services are Java-based, which is why Java remains central to the Salesforce stack. On top of that, Salesforce created Apex, a proprietary, Java-like language designed specifically for its cloud environment. Apex lets developers write business logic, triggers, and custom controllers directly on the platform, using a syntax that feels familiar to Java developers while being tightly integrated with Salesforce data.
More from this site
Keep reading the latest coverage
Frontend and User Interface Layers
The user interface depends on several web technologies. Visualforce, Salesforce's older markup framework, uses a tag-based syntax similar to HTML with server-side Apex controllers. Lightning Web Components, the modern alternative, rely on standard HTML, CSS, and JavaScript, built on Salesforce's Lightning framework. This shift means frontend Salesforce developers now work largely with standard web languages rather than a custom proprietary UI layer.
What the Platform Runs On
Salesforce operates as a multitenant cloud platform hosted on Salesforce's own infrastructure. The database, application logic, and runtime services are managed entirely by Salesforce, so developers do not interact with underlying operating systems or traditional server setups. The languages they write in—Apex, Java, HTML, CSS, and JavaScript—are all executed within Salesforce's managed runtime environments.
How Developers Interact with Salesforce Code
Developers access Salesforce code through the Salesforce Developer Console, VS Code with the Salesforce Extension Pack, or the Salesforce CLI. They write Apex classes and triggers, define Lightning components, and deploy changes using metadata API or Salesforce DX. Salesforce's integration with GitHub and its CI/CD tooling means the development workflow aligns with modern DevOps practices, even though the platform itself remains proprietary.
Why It Matters for Developers
Understanding Salesforce's language stack helps developers decide whether to build on the platform or integrate with it. If you are already comfortable with Java, Apex will feel approachable, and JavaScript-heavy frontend work fits naturally with Lightning. For organizations choosing between native Salesforce development and external integrations, the language choice affects tooling, hiring, and how much of the application lives inside Salesforce versus outside it.