Mobile App Scope Definition Assistance

I’m in the early stages of planning a mobile app, but right now the idea exists only as scattered notes and rough thoughts. I need a seasoned product or UX professional to help me turn those concepts into a clear, complete project brief that developers can actually build from.

Here’s what I’m hoping to accomplish together:

• Run a structured discovery session (or series of calls) to clarify core goals, target users, and success metrics.
• Translate the discussion into a concise requirements document outlining must-have and nice-to-have features, user stories, and acceptance criteria.
• Produce high-level wireframes or user-flow sketches that illustrate the main screens and navigation.
• Recommend suitable tech stack options, third-party services, and any compliance considerations for iOS and Android.
• Provide an estimated development roadmap with phased milestones so I can budget and schedule the work realistically.

I’m open to your preferred tools—Figma, Sketch, Miro, or any equivalent—as long as the final assets are shareable and easy for future developers to pick up.

If you have a track record of turning vague app ideas into developer-ready documentation, I’d love to see a sample of your previous scope or discovery work.