Open with the problem you are solving, not a list of screens. What kind of user will use this, how often, php development outsourcing and how is the job done today? An estimator who understands the goal will suggest an alternative that costs less; someone handed only a list of screens prices the list as written.
Set out the scope as user stories or scenarios: what the user does and angular development company what the system does in response. Equally important, list what you are not building. An explicit list of exclusions removes more friction later than any other single page. Mark too which decisions are settled and which are still open — honest teams price those differently, and concealing the open questions only hurts you.
List the constraints. This means systems you must integrate with, existing databases and their quality, security and compliance rules, expected load, supported browsers or devices and custom aws development stacks you cannot change. If a deadline is real, say why: an experienced team can often rearrange the plan to hit it, but only if they know it exists.
Define what completion means for each item. Acceptance criteria need not use any formal notation: a plain-language note setting out the expected behaviour will do. That one addition shortens the review at the end dramatically and closes off the usual argument at handover.
One last thing, ask react native developer for hire a specific format. Require a task-level breakdown, the assumptions behind each number, whatever the team considers risky and a range rather than a single figure. Read a wide range as useful information rather than evasion: it usually points to exactly which requirement is unclear. Then clarify that area and ask again — the next version will be far closer to reality.