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Begin with the problem you are solving, not your preferred technology. Which people will use the system, how many times a day, and what does the process look like without it? A vendor who understands the goal often proposes an alternative that costs less; someone handed only a list of screens will price exactly what you asked for.

Set out the scope as user stories symfony or spring boot scenarios: what the user does and what the system does in response. Every bit as useful, state explicitly what is out of scope. An explicit exclusion list saves more argument during acceptance than the rest of the brief combined. Mark too which items are decided and which are still open — the difference between flutter and react native changes the price, and concealing the open questions helps no one.

List the constraints. These include systems you must integrate with, existing databases and their quality, security and compliance rules, traffic expectations, supported browsers or devices and stacks you cannot change. If there is a hard date, say what depends on it: an experienced team can often resequence the work to hit it, but not if the date is a secret.

Say what the word done means for each item. Acceptance criteria do not require special syntax: a short list stating what a user should be able to do will do. That one addition compresses the review at the end by a surprising margin and removes the usual argument at handover.

One last thing, ask for a specific format. Ask for a task-level breakdown, react js developers for hire the assumptions used, the main risks and a range rather than a single figure. Treat a wide range as information, not evasion: it usually points to where your description is thin. From there clarify that area and request a revised number — the revised figure tends to be far closer to reality.