A Managing Systems Developer is responsible for designing, implementing, and managing computer systems. They analyze an organization's current computer system, identify deficiencies, and design system solutions to enhance efficiency and productivity. They code new software, modify existing software, test systems, and fix bugs. They also ensure system security and data integrity. They work closely with other IT professionals and end-users, providing technical support and training. They're involved in strategic planning, project management, and often have a say in purchasing decisions. They must stay updated with latest technologies and system development methodologies.