A Salesforce developer is a general term that can refer to anyone who develops on the Salesforce platform. Salesforce developers may work on a wide range of projects, including customizing Salesforce features and functionalities, building integrations with external systems, and creating custom applications using Apex, Visualforce, and Lightning components.
A Salesforce Lightning developer, on the other hand, is a developer who specializes in building custom user interfaces using the Lightning framework. You can hire a Salesforce Lightning developer to create custom Lightning components, applications, and pages to enhance the user experience of a Salesforce org.