A number produced without questions should be treated as a warning, not a service level. An experienced provider will come back with questions first: about integrations. A provider that quotes without asking anything is probably pricing a guess, and the gap resurfaces as a change order — at your expense.
Watch for a mismatch between the engineers on the sales call and the developers actually assigned. Insist on named engineers in the contract, with a clause that requires notice before anyone is swapped. A team that only offers a pool of resources and will not commit to individuals is preserving its own flexibility at your cost.
Require commit-level visibility from day one. A team that delivers code only at milestones is asking you to accept a black box. Daily commits tell you the actual pace far better than a weekly report. The same holds for the CI pipeline: web development company moscow if nothing runs automatically, quality claims remain nothing more than words.
Vague phrasing around IP is not a formality. The agreement must state explicitly that all outputs produced under it become the property of your company upon settlement of the relevant invoice. Also check the jurisdiction and the payment schedule: a request seo agency for software factory most of the money up front with nothing due in return for weeks removes the only leverage you have.
Lastly, examine how they communicate. Establish what overlap the teams will share each day, which person answers day-to-day questions and on what response times. Four hours of overlap generally works; zero overlap stretches a five-minute question into a twenty-four hour round trip. Careless writing in the early emails does not improve under delivery pressure.