Look first at relevant experience, not the number of logos on the website. Request a couple of projects that sit close to your technology stack, and react native app development company then ask whether those engineers are still with the company. A solid partner will put you on a call with the people who would work on your project. Answers that name nobody at this stage almost always mean you are talking to a reseller.
The paperwork deserves a slower read than the pitch. A few clauses carry most of the weight: assignment of intellectual property, the NDA, and exit terms and handover. Everything produced must transfer to you once invoices are settled, including designs, scripts and infrastructure configuration. Look closely at any clause that leaves framework code in the vendor’s hands, because it is usually exactly the piece that locks you in.
Find out how the estimate was built. An honest estimate comes with a written set of assumptions, a breakdown per feature and a best case and a worst case. A fixed price is only reasonable when the scope is genuinely frozen; otherwise the provider pads the number and next.js development agency you fund the buffer regardless. Hourly billing shifts that risk to you, so it needs a sprint cadence, demos and a budget cap.
How the work is run beats headcount. Ask how a new requirement enters the plan, who writes the acceptance criteria and how quality assurance works. A mature team should be able to walk you through a working build every one or two weeks. Clear, written acceptance criteria stay the only reliable protection against an argument at delivery time.
Finally, plan for laravel cms vs wordpress the end of the engagement before it becomes urgent. Insist that the code repository stays in your organisation from day one, and that a readme and architecture notes are kept current as the code changes. A provider confident in its own work says yes immediately; a long negotiation over it reveals quite a lot.