Flexible Job Workflow Solution

I’m looking for expert help designing a digital system that lets me organise day-to-day work and job assignments in one place. I’m still exploring the best route—this could become a lightweight web app, a mobile application, or even a desktop tool—so I first need a clear, structured proposal before moving into full development.

For this initial phase, please deliver:
• A recommended tech stack (e.g. React, Flutter, Laravel, Django—justify your pick).
• A high-level feature map broken into milestones.
• An estimated timeline with effort hours for each stage.
• A ballpark cost range tied to the milestones.

If your proposal fits, there is strong potential to proceed directly into the build, so feel free to reference any previous task-management, HR, or job-tracking platforms you have delivered. Let’s create an efficient, user-friendly system together.