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Look first at domain experience, not the length of the client list. Ask to see two or three engagements that match your domain and your stack, and then ask specifically who actually wrote that code. A solid partner will put you on a call with the engineers. Evasive answers at this stage almost always mean the delivery team is not the dedicated team vs freelance developer you were shown.

The paperwork needs more scrutiny than the proposal. A few clauses carry most of the weight: intellectual property assignment, non-disclosure, and exit terms and application support services handover. All the work product has to transfer to you once invoices are settled, including designs, top node js development companies scripts and infrastructure configuration. Watch for language that leaves framework code with the vendor, as that is often the dependency that makes switching painful.

Ask where their numbers come from. A credible estimate arrives with a written set of assumptions, a task-level breakdown and a range rather than a single number. A fixed-bid deal only makes sense when the scope is genuinely frozen; when the scope is still moving the vendor adds a risk premium and you pay for uncertainty either way. Hourly billing shifts that risk to you, so it needs a cap, regular demos and transparent reporting.

The delivery process beats team size. Establish how a new requirement enters the plan, who writes the acceptance criteria and how testing is organised. A well-run team will be able to show you a live build at the end of each sprint. Acceptance criteria in writing are your only real protection against endless rounds of rework.

Last, think about the handover at the start rather than at the end. Ask that the source repository lives on infrastructure you own from day one, and that documentation is written as you go rather than left to the end. A vendor with nothing to hide accepts it without argument; resistance at this point tells you quite a lot.