A High Availability Distributed Systems developer designs and maintains systems that ensure constant service availability, even when individual components fail. They create algorithms for data distribution across multiple servers, ensuring smooth operations and data consistency. They also implement failover mechanisms to switch operations to standby systems during failures. They monitor system performance, troubleshoot issues, and optimize for efficiency. The developer works with large-scale, complex systems, requiring deep knowledge of distributed computing, network programming, and data storage. They also need to understand business needs to ensure system functionality aligns with organizational objectives. Their ultimate goal is to provide seamless, uninterrupted service to users.