Begin with proven experience, not the length of the client list. Ask for a couple of case studies that sit close to your technology stack, and then ask specifically whether those engineers are still with the company. A serious vendor is happy to connect you with the tech lead. Evasive answers at this stage generally mean the delivery team is not the team you were shown.

The paperwork needs more attention than the sales deck. A few clauses carry most of the weight: intellectual property assignment, non-disclosure, and exit terms and handover. All the work product must transfer to you on payment, together with documentation, pipelines and deployment scripts. Watch for any clause that keeps reusable components with the vendor, as that is often the part you cannot replace later.

Ask where their numbers come from. An honest estimate is accompanied by a list of assumptions, a task-level breakdown and hire a development team an explicit range. A fixed-price contract works only when the scope is genuinely frozen; otherwise the provider adds a risk premium and you fund the buffer regardless. Time and materials puts the risk on your side, so it needs a cap, regular demos and transparent reporting.

How the work is run beats team size. Find out what happens when the scope changes, who writes the acceptance criteria and what the QA setup looks like. A mature team can demonstrate running custom software development uae rather than status reports. Clear, written acceptance criteria remain your only real protection against the it-was-never-in-scope conversation.

Finally, consider the end of the engagement at the start rather than at the end. Ask that the repository lives on infrastructure you own from day one, and that documentation is written as you go rather than left to the end. A vendor with nothing to hide says yes immediately; a long negotiation over it reveals most of what you need to know.