Begin with relevant experience, not the number of logos on the website. Request two or three projects that match your technology stack, and then ask specifically whether those engineers are still with the software product development company. A serious vendor will introduce you to the tech lead. Vague answers at this stage almost always mean the delivery team is not the hire dedicated development team you were shown.
The agreement warrants more scrutiny than the proposal. A few clauses carry most of the weight: assignment of intellectual property, non-disclosure, and exit terms and handover. Everything produced has to transfer to you as it is paid for, together with designs, scripts and web application development company infrastructure configuration. Be careful with any clause that keeps reusable components outside the transfer, because this is frequently exactly the piece that locks you in.
Find out how the estimate was built. A credible estimate is accompanied by a list of assumptions, a task-level breakdown and kubernetes software development company a range rather than a single number. A fixed-bid deal is only reasonable when the specification is complete; in any other case the supplier pads the number and you pay for uncertainty either way. A time-and-materials model puts the risk on your side, so it demands a cap, regular demos and transparent reporting.
The delivery process beats team size. Establish what happens when the scope changes, who signs off on a feature and what the QA setup looks like. A mature team can show you a working build every one or two weeks. Clear, written acceptance criteria are the practical protection against an argument at delivery time.
Finally, consider the day you no longer need this vendor while the relationship is still good. Require that the code repository sits on infrastructure you own from the beginning, and that documentation is written as you go rather than left to the end. A vendor with nothing to hide will agree quickly; hesitation here tells you most of what you need to know.
