A number produced without questions is a bad sign. Any serious team will come back with clarifying questions before any number: about integrations. A vendor that quotes without asking anything is probably pricing a guess, and that guess becomes a change request later — and you will pay for it.

Watch for best aso agencies for mobile games a mismatch between the team in the pitch and the hire react native developers actually assigned. Request named engineers in the statement of work, with a provision about substitutions. A provider that will only describe roles and never names specific engineers is reserving the right to assign anyone it likes.

Insist on the source repository from the first week. A partner that hands over a build only at the end of each phase is inviting you to trust a black box. Daily commits show you how many people are really working far better than a weekly report. This extends to the automated test suite: if nothing runs automatically, promises about quality remain just talk.

Loose contract language around IP is never a formality. The agreement needs to state explicitly that all outputs produced under it belong to your business on payment. Check also the governing law and the milestone terms: a request for most of the money up front with no milestone tied to it eliminates your only leverage.

Last, pay attention to the working rhythm. Confirm what overlap there will be with your working day, who is expected to answer questions and within what time. Four hours of overlap is usually enough; zero overlap turns a five-minute question into choosing a software development company lost day. Unclear written communication in the sales phase will not improve later.