Begin with proven experience, not the length of the client list. Ask for a couple of engagements that sit close to your stack, and then ask whether those engineers are still with the company. A solid partner will put you on a call with the tech lead. Answers that name nobody at this stage generally mean the delivery team is not the team you were shown.
The paperwork needs more scrutiny than the proposal. Three clauses do most of the work: ownership of the code, the NDA, and notice periods and handover. Every artifact must transfer to you on payment, together with documentation, pipelines and deployment scripts. Be careful with wording that keeps so-called reusable libraries outside the transfer, as that is often exactly the piece that locks you in.
Ask how they estimate. A serious estimate comes with a list of assumptions, custom laravel development a breakdown by feature or module and a range rather than a single number. A fixed-bid deal works only when the specification is complete; otherwise the vendor pads the number and you pay for it outsourcing europe anyway. A time-and-materials model moves the risk back to the client, so it requires a cap, regular demos and transparent reporting.
The delivery process beats team size. Ask how change requests are handled, who signs off on a feature and how quality assurance works. A mature team can show you a working build every one or two weeks. Clear, written acceptance criteria are the only reliable protection against the it-was-never-in-scope conversation.
Finally, plan for the end of the engagement while the relationship is still good. Insist that the repository sits on infrastructure you own from day one, and hire node js experts that documentation is written as you go rather than left to the end. A provider confident in its own work accepts it without argument; resistance at this point reveals quite a lot.