Start with domain experience, node js development agency not the length of the client list. Ask for a couple of engagements that match your domain and your stack, and then ask which engineers actually built it. A solid partner will introduce you to the people who would work on your project. Vague answers at this stage usually mean the demo work came from somewhere else.
The contract warrants a slower read than the pitch. Three sections matter more than the rest: intellectual property assignment, the NDA, and notice periods and handover. Every artifact has to transfer to you as it is paid for, along with designs, scripts and infrastructure configuration. Watch for language that keeps reusable components with the vendor, as this is frequently the dependency that makes switching painful.
Ask where their numbers come from. A credible estimate arrives with the assumptions behind it, a breakdown per feature and a best case and a worst case. A fixed-bid deal is only reasonable when the requirements are stable and documented; when the scope is still moving the supplier prices the risk in and you pay for uncertainty either way. Time and materials shifts that risk to you, so it needs a cap, regular demos and symfony software transparent reporting.
How the work is run matters as much as headcount. Ask how change requests are handled, mobile app optimization services who writes the acceptance criteria and how quality assurance works. A well-run team will be able to show you a live build at the end of each sprint. Written acceptance criteria are the only reliable protection against an argument at delivery time.
Before signing, consider the end of the engagement before it becomes urgent. Ask that the source repository lives on infrastructure you own from the beginning, and that the documentation is refreshed in every sprint. A provider confident in its own work says yes immediately; resistance at this point tells you quite a lot.
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