Start with the problem you are solving, not your preferred technology. Who will use it day to day, how many times a day, and how is the job done today? An estimator who grasps the purpose will suggest an alternative that costs less; one who only sees the requirements as given can only price the list as written.

Define what is included as user stories or scenarios: who does what, and what happens next. Equally important, list what is out of scope. An explicit exclusion list saves more disagreement at delivery time than the rest of the brief combined. Also mark which items are decided and which may still change — estimators price uncertainty, and pretending everything is fixed helps no one.

List the constraints. The list covers systems you must integrate with, the data you already hold and its condition, regulatory obligations, traffic expectations, which devices matter and any technology you are committed to. If a deadline is real, say why: an experienced team is usually able to resequence the work to meet it, golang consulting services but not if the date is a secret.

Say what the word done means for the important items. Testable acceptance criteria do not require formal language: a short list setting out the expected behaviour is sufficient. That one addition reduces acceptance testing considerably and removes the most common source of disputes.

One last thing, say what you expect back. Ask for an itemised estimate, the assumptions used, the risks the team sees and a low number and a high number. Treat a wide range as useful information rather than evasion: react js consulting services it normally identifies exactly which requirement is unclear. Then clarify that area and ask again — the second estimate will be much more reliable.