Start with proven experience, not the number of logos on the website. Ask to see three or four projects that match your stack, and then ask which engineers actually built it. A solid partner is happy to connect you with the engineers. Vague answers at this stage usually mean you are talking to a reseller.

The contract deserves a slower read than the pitch. Three clauses do most of the work: intellectual property assignment, non-disclosure, and notice periods and handover. Every artifact must transfer to you once invoices are settled, including source code, designs and infrastructure as code. Watch for language that keeps reusable components in the vendor's hands, as it is usually the part you cannot replace later.

Ask how they estimate. A serious estimate is accompanied by a list of assumptions, node js vs laravel performance a task-level breakdown and a range rather than a single number. A fixed price only makes sense when the specification is complete; otherwise the provider prices the risk in and you pay for it anyway. Hourly billing puts the risk on your side, so it requires a cap, regular demos and transparent reporting.

Process beats the number of developers. Find out what happens when the scope changes, who signs off on a feature and how quality assurance works. A team should be able to demonstrate running software rather than status reports. Clear, .net development company written acceptance criteria stay the practical protection against endless rounds of rework.

Before signing, think about the handover at the start rather than at the end. Require that the repository lives under your account from day one, and that documentation is updated as part of the work. A vendor with nothing to hide will agree quickly; hesitation here reveals quite a lot.