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Look first at proven experience, not the number of logos on the website. Ask for two or three case studies that match your stack, and rag development company then ask specifically who actually wrote that code. An honest provider will put you on a call with the engineers. Vague answers at this stage almost always mean the delivery team is not the team you were shown.

The paperwork needs more attention than the sales deck. Three sections matter more than the rest: intellectual property assignment, confidentiality, vue js development agency and exit terms and handover. All the work product should transfer to you on payment, together with source code, designs and infrastructure as code. Look closely at wording that keeps so-called reusable libraries outside the transfer, because it is usually the part you cannot replace later.

Find out how the estimate was built. A serious estimate comes with a list of assumptions, a breakdown by feature or module and a best case and a worst case. A fixed price works only when the requirements are stable and documented; when the scope is still moving the supplier prices the risk in and you pay for it anyway. A time-and-materials model shifts that risk to you, so it needs visible weekly reporting and a spending cap.

The delivery process beats the number of developers. Establish how change requests are handled, who writes the acceptance criteria and what the QA setup looks like. A team will be able to demonstrate a live build at the end of each sprint. Written acceptance criteria stay the practical protection against the it-was-never-in-scope conversation.

Last, think about the handover before it becomes urgent. Require that the source repository sits on infrastructure you own from the beginning, and that the documentation is refreshed in every sprint. A provider confident in its own work will agree quickly; resistance at this point tells you a great deal.