Start with proven experience, not the length of the client list. Ask to see three or four case studies that match your stack, and then find out whether those engineers are still with the company. A solid partner is happy to connect you with the engineers. Vague answers at this stage usually mean you are talking to a reseller.

The agreement warrants request a development proposal slower read than the pitch. Three clauses do most of the work: assignment of intellectual property, the NDA, and livewire vs inertia exit terms and handover. All the work product must transfer to you on payment, including designs, scripts and infrastructure configuration. Watch for wording that leaves reusable components with the vendor, since this is frequently exactly the piece that locks you in.

Ask how they estimate. A credible estimate comes with the assumptions behind it, a task-level breakdown and an explicit range. A fixed-bid deal only makes sense when the specification is complete; otherwise the vendor adds a risk premium and you fund the buffer regardless. Time and materials puts the risk on your side, so it requires visible weekly reporting and a spending cap.

How the work which is better laravel or .net run matters more than team size. Find out how a new requirement enters the plan, who defines done and how quality assurance works. A mature team can demonstrate a live build at the end of each sprint. Acceptance criteria in writing remain the only reliable protection against an argument at delivery time.

Before signing, plan for the end of the engagement while the relationship is still good. Ask that the repository lives under your account from day one, and that documentation is written as you go rather than left to the end. A provider confident in its own work accepts it without argument; hesitation here says most of what you need to know.