mobile app backend development

this is an app for on-demand tailoring service. front end is being developed & prospective candidate would have following responsibilities:

Developing and maintaining all server-side network components.
Ensuring optimal performance of the central database and responsiveness to front-end requests.
Collaborating with front-end developers on the integration of elements.
Designing customer-facing UI and back-end services for various business processes.
Developing high-performance applications by writing testable, reusable, and efficient code.
Implementing effective security protocols, data protection measures, and storage solutions.
Running diagnostic tests, repairing defects, and providing technical support.
Documenting Node.js processes, including database schemas, as well as preparing reports.
Recommending and implementing improvements to processes and technologies.
Keeping informed of advancements in the field of Node.js development.