An estimate that arrives instantly is a warning, not a service level. An experienced provider will come back with questions first: about integrations. A vendor typescript development services that commits to a figure without asking anything is simply pricing a guess, and the gap becomes a change request later — and you will pay for it.

Watch for a mismatch between the people you meet and the people who will code. Ask for the names and CVs of the actual team in the statement of work, with a clause covering replacement. A team that only offers roles and will not commit to individuals is keeping the option to staff you with whoever is free.

Insist on access to the repository from the start. A team that shows a build only at the end of each phase is asking you to accept a black box. Visible commits tell you the actual pace far better than a weekly report. The same holds for the CI pipeline: if nothing runs automatically, quality claims are just talk.

Loose wording in the contract around code ownership is never an oversight. The contract needs to state plainly that the code, designs and ios aso agency documentation become the property of your business upon settlement of the relevant invoice. Look too at the jurisdiction and how payments are structured: a request for most of the money up front with no milestone tied to it eliminates any leverage you would otherwise keep.

Last, examine communication. Confirm what overlap you will share with your timezone, which person is expected to answer your questions and how quickly. Four hours of overlap is usually enough; zero overlap turns a five-minute question into a lost day. Sloppy written English in the sales phase does not improve under delivery pressure.