Some of the roles and responsibilities of Express JS developers are:
• Develop and maintain server-side network components
• Ensure optimal performance of central database with responsiveness to front-end requests
• Collaborate with front-end developers on integration of different elements
• Design customer-facing UI with back-end services for business processes
• Develop high-performance applications through reusable, efficient, and testable code
• Run diagnostic tests, repair defects, and provide technical support
• Document Express.js processes
• Recommend and implement changes