Start with the business problem, not your preferred technology. Which people will use it day to day, with what frequency, and what does the process look like without it? An estimator who knows what you are trying to achieve often proposes a simpler way to reach it; a team that receives only a list of screens will price exactly what you asked for.

Describe the scope as short scenarios: software development companies in eastern europe who does what, and what happens next. Equally important, state explicitly what the first release deliberately excludes. An explicit exclusion list removes more disagreement at delivery time than any other single page. Mark too which items are decided and which are still open — honest teams price those differently, and concealing the open questions only hurts you.

Write down the hard constraints. These include the platforms and services involved, existing databases and their quality, regulatory obligations, user volumes, target platforms and any technology you are committed to. If there is a hard date, say why: a team can often rearrange the plan to hit it, provided they hear about it early.

Say what completion means for the important items. Clear acceptance criteria do not need special syntax: a short paragraph setting out what a user should be able to do will do. This single habit compresses the review at the end considerably and closes off the usual argument at handover.

Finally, say what you expect back. Require a task-level breakdown, the assumptions behind each number, whatever the team considers risky and a low number and a high number. Take a broad range as a signal about the brief: it normally identifies where your description is thin. Then tighten that section and react native development agency request a revised number — the next version tends to be much more reliable.