Begin with the reason this software should exist, not a list of screens. Who will use the system, hire dedicated mobx developer how often, and what happens today? An experienced team who knows what you are trying to achieve will suggest a simpler way to reach it; a team that receives only a list of screens can only price the list as written.
Define what is included as concrete flows: a walk through each important path. Every bit as useful, write down what you are not building. An explicit exclusion list removes more argument later than almost anything else in the document. Mark too which parts are firm and which are still open — honest teams price those differently, and pretending everything is fixed helps no one.
Write down the hard constraints. The list covers existing systems the software has to talk to, existing databases and their quality, regulatory obligations, traffic expectations, which is better rest or graphql target platforms and infrastructure that is already decided. If a deadline is real, explain what drives it: a good team will often cut the right scope to meet it, provided they hear about it early.
Write down what done means feature by feature. Clear acceptance criteria do not need any formal notation: a plain-language note setting out what a user should be able to do will do. That one addition shortens the sign-off process dramatically and eliminates the most common source of disputes.
Finally, say what you expect back. Require an itemised estimate, the assumptions used, whatever the team considers risky and a range rather than a single figure. Treat a wide range as useful information rather than evasion: it normally identifies exactly which requirement is unclear. From there clarify that area and request a revised number — the next version is far closer to reality.
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