Begin with relevant experience, not the size of the portfolio. Request two or three engagements that sit close to your stack, and then ask specifically which engineers actually built it. A serious vendor will introduce you to the tech lead. Evasive answers at this stage generally mean the delivery dedicated development team is not the team you were shown.
The agreement needs more attention than the sales deck. Three clauses do most of the work: ownership of the code, the NDA, and notice periods and handover. All the work product should transfer to you as it is paid for, along with designs, scripts and infrastructure configuration. Watch for wording that keeps so-called reusable libraries in the vendor's hands, because that is often the part you cannot replace later.
Ask how they estimate. An honest estimate comes with the assumptions behind it, a breakdown per feature and a range rather than a single number. A fixed-bid deal is only reasonable when the scope is genuinely frozen; otherwise the vendor adds a risk premium and edtech web application hosting you fund the buffer regardless. Hourly billing puts the risk on your side, so it needs visible weekly reporting and a spending cap.
Process beats team size. Find out how a new requirement enters the plan, who writes the acceptance criteria and how quality assurance works. A well-run team will be able to walk you through running software rather than status reports. Clear, written acceptance criteria remain your only real estate platform development company protection against the it-was-never-in-scope conversation.
Before signing, hire react native mobile app developers think about the end of the engagement before it becomes urgent. Insist that the source repository lives under your account from day one, and that the documentation is refreshed in every sprint. A provider confident in its own work accepts it without argument; resistance at this point reveals most of what you need to know.
