An Apex Programming developer designs, codes, and modifies Salesforce applications using Apex, a proprietary programming language by Salesforce. They are responsible for creating robust solutions to enhance business processes. Their tasks include understanding requirements, designing application features, writing clean and efficient code, integrating data storage solutions, and ensuring high performance and responsiveness. They also perform debugging and troubleshooting, maintaining code quality, and implementing security and data protection settings. Additionally, they collaborate with other team members and stakeholders, ensuring the applications align with user needs and system requirements.