Start with proven experience, not the number of logos on the website. Request three or four case studies that resemble your stack, and then ask whether those engineers are still with the company. A serious vendor will introduce you to the engineers. Evasive answers at this stage almost always mean the delivery team is not the team you were shown.
The contract warrants more attention than the sales deck. Three clauses do most of the work: assignment of intellectual property, the NDA, and notice periods and handover. Every artifact should transfer to you on payment, together with designs, scripts and infrastructure configuration. Look closely at any clause that leaves reusable components outside the transfer, as that is often exactly the piece that locks you in.
Find out how the estimate was built. A credible estimate comes with a list of assumptions, a breakdown by feature or module and a best case and a worst case. A fixed-bid deal works only when the requirements are stable and documented; when the scope is still moving the provider prices the risk in and you pay for it anyway. Hourly billing moves the risk back to the client, so it requires visible weekly reporting and a spending cap.
The delivery process beats the number of hire developers in eastern europe. Ask what happens when the scope changes, who defines done and how to evaluate software development company quality assurance works. A well-run team can show you running software rather than status reports. Acceptance criteria in writing are the only reliable protection against endless rounds of rework.
Before signing, plan for web development company usa the end of the engagement while the relationship is still good. Ask that the repository sits in your organisation from the first commit, and that the documentation is refreshed in every sprint. why hire a dedicated team instead of freelancers provider confident in its own work accepts it without argument; a long negotiation over it reveals quite a lot.