A comprehensive project plan that includes a timeline with milestones, resources allocation, and responsibilities should be developed. This plan can be in the form of a a project management tool like Jira or Asana.

I will provide the cross platform, mobile optimize code according to the provided design or mock up. If not available I can create mock up / design for you. The provided code can be modern framework of your choice (React, Angular, Vue).

I will provide rest api's with clean, optimized and scalable code. I can provide code in Laravel, Node.js depending on the project needs.

I will share the guidelines for deploying the app for real world use. It can be done according to the solution you choose or I can recommend depending on the project.