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Start with domain experience, not the number of logos on the website. Request two or three 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 introduce you to the tech lead. Vague answers at this stage usually mean you are talking to a reseller.

The contract warrants more scrutiny than the proposal. Three clauses do most of the work: intellectual property assignment, confidentiality, and outsource retail ecommerce development termination and handover. All the work product should transfer to you as it is paid for, together with designs, scripts and infrastructure configuration. Watch for language that leaves so-called reusable libraries outside the transfer, as this is frequently the part you cannot replace later.

Ask where their numbers come from. A credible estimate is accompanied by the assumptions behind it, a task-level breakdown and a best case and a worst case. A fixed-bid deal is only reasonable when the scope is genuinely frozen; otherwise the provider prices the risk in and you pay for uncertainty either way. Time and materials shifts that risk to you, so it demands visible weekly reporting and a spending cap.

How the work is run matters more than headcount. Ask how change requests are handled, who signs off on a feature and how quality assurance works. A team should be able to walk you through a live build at the end of each sprint. Clear, written acceptance criteria remain the only reliable protection against an argument at delivery time.

Finally, think about the handover while the relationship is still good. Require that the code repository sits on infrastructure you own from the first commit, edtech development company and that a readme and top python development companies architecture notes are kept current as the code changes. A vendor with nothing to hide says yes immediately; a long negotiation over it says most of what you need to know.