Open with the problem you are solving, not a feature list. Who will use the system, how often, and how is the job done today? A vendor who knows what you are trying to achieve can propose an alternative that costs less; a team that receives only a feature list prices your assumptions along with the work.
Define what is included as concrete flows: crypto futures trading software development what the user does and what the system does hire developers in saudi arabia response. Every bit as useful, write down what is out of scope. A written out-of-scope list removes more friction during acceptance than any other single page. Mark too which items are decided and which are still under discussion — the difference changes the price, and concealing the open questions helps nobody.
Write down the hard constraints. These include systems you must integrate with, the data you already hold and its condition, compliance requirements, expected load, which devices matter and stacks you cannot change. Where a date is genuinely fixed, explain what drives it: a team will often cut the right scope to meet it, but only if they know it exists.
Say what the word done means for the important items. Testable acceptance criteria do not require any formal notation: a plain-language note describing what must be true when the feature works is enough. This one section shortens the sign-off process by a surprising margin and removes the most common source of disputes.
One last thing, say what you expect back. Require a task-level breakdown, the assumptions behind each number, whatever the team considers risky and a low number and a high number. Read a wide range as useful information rather than evasion: it normally identifies where your description is thin. Then rewrite that part and ask again — the next version will be far closer to reality.