A number produced without questions is a warning, not a service level. A competent team responds with a list of questions: about integrations. A supplier that quotes before understanding the scope is guessing, and that guess will be corrected later — on your budget.

Be wary of a mismatch between the engineers on the sales call and those who eventually appear in the repository. Request named engineers in the statement of work, with wording covering replacement. A vendor that talks only about roles and never names specific engineers is reserving the option to staff you with whoever is free.

Insist on access to the repository from the first week. A team that shows code only at milestones is inviting you to take delivery on faith. Regular commits and difference between laravel and .net pull requests show you how many people are really working far better than a slide deck. The same holds for the automated test suite: if nothing runs automatically, software outsourcing assurances about quality are just talk.

Ambiguous wording in the contract around intellectual property is never a formality. The contract must state explicitly that all deliverables belong to your company upon settlement of the relevant invoice. Look too at which country's law applies and the payment schedule: heavy prepayment with nothing due in return for weeks eliminates your only leverage.

Finally, pay attention to the working rhythm. Ask how many hours the teams will share with your timezone, which person is expected to answer day-to-day questions and within what time. Four hours of overlap generally works; zero overlap converts each small question into a day of delay. Sloppy written English in the sales phase will not improve later.