Look first at domain experience, not the number of logos on the website. Ask seo agency for software companies a couple of projects that resemble your stack, and then find out who actually wrote that code. A serious vendor is happy to connect you with the tech lead. Answers that name nobody at this stage almost always mean the demo work came from somewhere else.
The agreement needs more attention than the sales deck. Three sections matter more than the rest: intellectual property assignment, the NDA, and exit terms and handover. Everything produced should transfer to you as it is paid for, together with source code, designs and infrastructure as code. Be careful with wording that keeps reusable components with the vendor, because that is often exactly the piece that locks you in.
Ask where their numbers come from. An honest estimate is accompanied by a written set of assumptions, a task-level breakdown and a best case and a worst case. A fixed price is only reasonable when the specification is complete; when the scope is still moving the provider prices the risk in government and public sector software development offshore software development company you fund the buffer regardless. Hourly billing puts the risk on your side, so it demands a cap, regular demos and transparent reporting.
How the work is run matters as much as headcount. Establish how change requests are handled, who writes the acceptance criteria and how testing is organised. A mature team should be able to demonstrate a working build every one or two weeks. Clear, written acceptance criteria remain the only reliable protection against an argument at delivery time.
Last, plan for the handover before it becomes urgent. Require that the source repository stays on infrastructure you own from day one, and that the documentation is refreshed software development company in uk every sprint. A vendor with nothing to hide will agree quickly; a long negotiation over it says most of what you need to know.
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