An estimate that arrives instantly should be treated as a bad sign. A competent team will come back with questions first: about integrations. A provider that commits to a figure without asking anything is probably pricing a guess, and the gap resurfaces as a change order — and you will pay for it.
Be wary of a mismatch between the team in the pitch and the developers actually assigned. Insist on specific people rather than roles in the agreement, with a clause that requires notice before anyone is swapped. A team that only offers roles and refuses to name people is preserving the option to staff you with whoever is free.
Insist on access to the repository from day one. A team that hands over nothing between demos is asking you to accept a black box. Visible commits show you how many people are really working far better than any status report. The same holds for the automated test suite: if it does not exist, assurances about quality remain nothing more than words.
Ambiguous phrasing around code ownership is not a formality. The agreement should state explicitly that all outputs produced under it become the property of your igaming development company upon settlement of the relevant invoice. Check also which country’s law applies and how payments are structured: a request for next.js development services most of the money up front with nothing due in return for weeks removes the only leverage you have.
Last, examine how they communicate. Confirm how much working-time overlap the teams will share with your timezone, enterprise ai development services which named person answers questions and on what response times. A few hours of overlap is usually enough; no overlap stretches every clarification into a day of delay. Unclear written communication in the early emails will not improve under delivery pressure.