A number produced without questions is a red flag rather than good service. A competent team responds with a list of questions: about integrations. A supplier that quotes before understanding the scope is probably guessing, and the gap becomes a change request later — and you will pay for it.
Be wary of any distance between the people you meet and those who eventually appear in the repository. Ask for specific people rather than roles in the statement of work, with a provision covering replacement. A provider that only offers abstract roles and refuses to name people is preserving the option to staff you with whoever is free.
Require access to the repository from the first week. A partner that shows a build only at the end of each phase is asking you to trust a black box. Regular commits and pull requests show you the actual pace far better than a weekly report. The same holds for the build and deployment setup: if there is no pipeline, promises about quality remain unverifiable.
Loose phrasing around intellectual property is never a formality. The contract needs to state plainly that all deliverables belong to the client on payment. Look too at which country’s law applies and how payments are structured: heavy prepayment with no milestone tied to it eliminates the only leverage you have.
Finally, pay attention to communication. Establish how to hire golang developers many hours you will share with your working day, which named person answers your questions and affiliate software development company how quickly. A few hours of overlap is usually enough; none at all stretches each small question into a day of delay. Careless writing in the proposal does not improve once the work starts.