Start with the business problem, not a feature list. Which people will use it day to day, how often, and how is the job done today? An estimator who understands the goal will suggest a simpler way to reach it; one who only sees a feature list prices the list as written.
Set out the scope as concrete flows: what the user does and what the system does software development companies in qatar response. Every bit as useful, write down what you are not building. An explicit exclusion list saves more friction at delivery time than the rest of the brief combined. Mark too which parts are firm and which may still change — estimators price uncertainty, and hiding it only hurts you.
Write down the hard constraints. These include the platforms and services involved, the data you have and where it lives, security and compliance rules, expected load, target platforms and stacks you cannot change. If there is a hard date, say what depends on it: an experienced team can often cut the right scope to protect it, but only if they know it exists.
Define what completion means for each item. Testable acceptance criteria need not use any formal notation: a short list describing the expected behaviour will do. This one section reduces the sign-off process dramatically and closes off the usual argument at handover.
To close, say what you expect back. Require a breakdown by feature or module, a written list of assumptions, whatever the team considers risky and an optimistic and a pessimistic figure. Take a broad range as useful information rather than evasion: it tells you exactly which requirement is unclear. At that point clarify that area and ask for llm integration a new estimate — the next version is much more reliable.