Begin with proven experience, not the number of logos on the website. Request a couple of engagements that resemble your stack, and then ask which engineers actually built it. An honest provider will put you on a call with the tech lead. Evasive answers at this stage usually mean you are talking to a reseller.
The agreement needs more attention than the sales deck. A few clauses carry most of the weight: ownership of the code, symfony development services confidentiality, and termination and handover. Everything produced must transfer to you once invoices are settled, along with source code, designs and infrastructure as code. Watch for wording that keeps framework code with the vendor, because this is frequently exactly the piece that locks you in.
Ask where their numbers come from. An honest estimate arrives with a list of assumptions, a breakdown per feature and an explicit range. A fixed price only makes sense when the scope is genuinely frozen; when the scope is still moving the supplier prices the risk hire developers in russia and web frameworks comparison you pay for it anyway. Time difference between livewire and react materials moves the risk back to the client, so it requires a sprint cadence, demos and a budget cap.
The delivery process matters more than team size. Establish what happens when the scope changes, who writes the acceptance criteria and what the QA setup looks like. A well-run team should be able to walk you through a working build every one or two weeks. Written acceptance criteria are the only reliable protection against endless rounds of rework.
Finally, think about the day you no longer need this vendor at the start rather than at the end. Ask that the code repository lives under your account from day one, and that the documentation is refreshed in every sprint. A vendor with nothing to hide accepts it without argument; a long negotiation over it reveals most of what you need to know.
