Start with the problem you are solving, not a list of screens. Who will use the system, how to choose software development partner many times a day, and what does the process look like without it? An estimator who understands the goal will suggest a cheaper route to it; one who only sees the requirements as given can only price exactly what you asked react js developers for hire.
Set out the scope as user stories or scenarios: what the user does and what the system does in response. Just as important, offshore software development company state explicitly what you are not building. A written out-of-scope list prevents more argument at delivery time than the rest of the brief combined. Mark too which parts are firm and which may still change — estimators price uncertainty, net cloud development and concealing the open questions helps no one.
Set out your constraints. These include the platforms and services involved, the data you already hold and its condition, compliance requirements, user volumes, which devices matter and stacks you cannot change. If a deadline is real, explain what drives it: a good team can often resequence the work to meet it, but not if the date is a secret.
Write down what the word done means feature by feature. Testable acceptance criteria do not need special syntax: a short list setting out what a user should be able to do is enough. This one section compresses acceptance testing considerably and closes off the usual argument at handover.
One last thing, ask for a specific format. Request an itemised estimate, the assumptions used, the risks the team sees and a range rather than a single figure. Read a wide range as useful information rather than evasion: it tells you where your description is thin. Then tighten that section and ask again — the next version tends to be far closer to reality.
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