A JIRA/Trello developer manages and customizes the JIRA or Trello platform to optimize project management workflows. They design and implement process templates, set up user permissions, and customize fields to match business requirements. Their role involves integrating JIRA/Trello with other software tools, developing plugins or apps for added functionalities, and troubleshooting issues. They are also responsible for maintaining system stability, training users, and providing technical support. The goal is to enhance team collaboration, track project progress, and ensure timely and efficient completion of tasks. They require skills in Agile methodologies, scripting languages, and database management.