Open with the business problem, not your preferred technology. What kind of user will use the system, how many times a day, and what does the process look like without it? A vendor who knows what you are trying to achieve often proposes a simpler way to reach it; a team that receives only a list of screens will price the list as written.
Set out the scope as short scenarios: software developer hourly rate who does what, and what happens next. Every bit as useful, state explicitly what you are not building. A written out-of-scope list removes more friction later than almost anything else in the document. Mark too which parts are firm and which are still open — the difference changes the price, and hiding it helps nobody.
Set out your constraints. The list covers the platforms and python consulting services involved, retail ecommerce platform development company existing databases and their quality, compliance requirements, expected load, which devices matter and any technology you are committed to. If a deadline is real, explain what drives it: a team will often resequence the work to protect it, provided they hear about it early.
Define what done means developers for hire the important items. Acceptance criteria need not use formal language: a plain-language note setting out what a user should be able to do is enough. That one addition compresses acceptance testing by a surprising margin and removes most late-stage disagreement.
One last thing, state what you want in the response. Request a breakdown by feature or module, a written list of assumptions, whatever the team considers risky and an optimistic and a pessimistic figure. Read a wide range as useful information rather than evasion: it usually points to where your description is thin. From there clarify that area and ask again — the revised figure will be the one worth planning around.
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