An estimate that arrives instantly should be treated as a red flag rather than good service. Any serious team responds with questions first: about users and volumes. A vendor that quotes before understanding the scope is probably 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 those who eventually appear in the repository. Request named engineers in the statement of work, average cost of custom software development with a clause that requires notice before anyone is swapped. A vendor that only offers abstract roles and will not commit to individuals is keeping the option to staff you with whoever is free.

Ask for commit-level visibility from day one. A team that shows nothing between demos expects you to accept a black box. Visible commits tell you how many people are really working far better than a slide deck. The same applies to the build and deployment setup: if nothing runs automatically, assurances about quality are just talk.

Loose phrasing around intellectual property is not a formality. The contract should state plainly that all deliverables become the property of your company upon settlement of the relevant invoice. Look too at the governing law and microservices vs monolith how payments are structured: hire backend developers a request for most of the money up front with no deliverable attached eliminates any leverage you would otherwise keep.

Finally, examine the working rhythm. Confirm what overlap the teams will share with your timezone, who is expected to answer day-to-day questions and within what time. A few hours of overlap generally works; zero overlap stretches each small question into a lost day. Careless writing in the sales phase rarely improves later.