Begin with the business problem, not a list of screens. Which people will use the system, how many times a day, and what does the process look like without it? An estimator who knows what you are trying to achieve can propose a cheaper route to it; someone handed only a feature list can only price the list as written.
Describe the scope as user stories or scenarios: what the user does and what the system does in response. Equally important, write down what the first release deliberately excludes. A written out-of-scope list prevents more argument later than the rest of the brief combined. Indicate as well which items are decided and which are still open — estimators price uncertainty, and hiding it helps nobody.
Write down the hard constraints. The list covers the platforms and crm development company services involved, the data you have and where it lives, compliance requirements, traffic expectations, which devices matter and stacks you cannot change. If a deadline is real, explain what drives it: build an mvp experienced team can often cut the right scope to hit it, but not if the date is a secret.
Write down what the word done means feature by feature. Clear acceptance criteria do not need formal language: a short paragraph describing what must be true when the feature works is enough. This one section shortens the review at the end dramatically and eliminates the usual argument at handover.
Finally, ask for a specific format. Request a breakdown by feature or kotlin software development company module, the assumptions used, the main risks and a low number and a high number. Read a wide range as a signal about the brief: it usually points to exactly which requirement is unclear. Then clarify that area and request a revised number — the revised figure tends to be far closer to reality.