Start with relevant experience, not the number of logos on the website. Request two or three engagements that resemble your technology stack, and then find out whether those engineers are still with the react js web development company. A solid partner will introduce you to the people who would work on your project. Evasive answers at this stage almost always mean the delivery team is not the team you were shown.

The paperwork needs more scrutiny than the proposal. A few clauses carry most of the weight: ownership of the code, non-disclosure, and notice periods and handover. All the work product has to transfer to you as it is paid for, together with designs, scripts and infrastructure configuration. Look closely at any clause that leaves so-called reusable libraries with the vendor, because it is usually exactly the piece that locks you in.

Ask how they estimate. An honest estimate comes with the assumptions behind it, a task-level breakdown and a best case and a worst case. A fixed price vs time and materials price works only when the specification is complete; otherwise the provider adds a risk premium and you fund the buffer regardless. A time-and-materials model shifts that risk to you, so it needs a sprint cadence, demos and a budget cap.

Process matters more than the number of developers. Find out how a new requirement enters the plan, who signs off on a feature and what the QA setup looks like. A well-run team should be able to demonstrate running software rather than status reports. Acceptance criteria in writing remain your only real protection against the it-was-never-in-scope conversation.

Last, consider the day you no longer need this vendor while the relationship is still good. Insist that the source repository stays on infrastructure you own from the first commit, and that documentation is updated as part of the work. A partner who is comfortable with this says yes immediately; resistance at this point reveals a great deal.

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