Begin with relevant experience, not the length of the client list. Request a couple of case studies that match your domain and your stack, and then ask specifically whether those engineers are still with the vue.js development company. A serious vendor will put you on a call with the tech lead. Vague answers at this stage usually mean the delivery team is not the team you were shown.
The contract deserves a slower read than the pitch. A few clauses carry most of the weight: .net core cross platform development assignment of intellectual property, the NDA, and notice periods and handover. Every artifact should transfer to you once invoices are settled, together with documentation, pipelines and deployment scripts. Watch for language that keeps reusable components in the vendor’s hands, because it is usually the part you cannot replace later.
Ask how they estimate. A serious estimate comes with a list of assumptions, a breakdown per feature 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 seo agency for saas uncertainty either way. A time-and-materials model puts the risk on your side, so it demands visible weekly reporting and a spending cap.
The delivery process matters as much as the number of developers. Ask how change requests are handled, who defines done and how testing is organised. A well-run team should be able to show you a working build every one or two weeks. Clear, written acceptance criteria remain the practical protection against endless rounds of rework.
Before signing, think about the end of the engagement while the relationship is still good. Ask that the code repository sits under your account from the first commit, and that documentation is updated as part of the work. A provider confident in its own work accepts it without argument; a long negotiation over it says a great deal.
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