Open with the reason this software should exist, not a feature list. Who will use it day to day, which is better rest or graphql how many times a day, and how is the job done today? An experienced team who knows what you are trying to achieve often proposes a cheaper route to it; someone handed only a feature list will price exactly what you asked for.

Describe the scope as user stories or scenarios: what the user does and what the system does in response. Every bit as useful, state explicitly what is out of scope. A written out-of-scope list removes more disagreement during acceptance than any other single page. Mark too which parts are firm and which are still open — honest teams price those differently, typescript web development company and pretending everything is fixed helps nobody.

List the constraints. This means existing systems the software has to talk to, the data you already hold and its condition, compliance requirements, traffic expectations, which devices matter and stacks you cannot change. If a deadline is real, explain what drives it: a good team will often cut the right scope to protect it, but not if the date is a secret.

Say what the word done means for each item. Acceptance criteria do not need special syntax: a short list setting out the expected behaviour will do. This single habit compresses the review at the end dramatically and eliminates most late-stage disagreement.

To close, state what you want in the response. Request a task-level breakdown, the assumptions behind each number, blockchain development outsourcing the main risks and an optimistic and a pessimistic figure. Treat a wide range as useful information rather than evasion: it usually points to the part of the brief that needs work. At that point clarify that area and ask for a new estimate — the revised figure will be the one worth planning around.