Solar Digital’s React.js page is a useful example of what to look for in a vendor. It lists consulting, migration, refactoring and maintenance next to new development, and that is the range worth asking any team about. Before choosing, I would ask every candidate three things: can they take over an existing codebase, who handles updates and bug fixes after launch, and will they give a timeline during planning rather than after the contract is signed. Cost depends on scope, features, team expertise and deadlines, so compare quotes against the same brief. If your product needs a dynamic interface or real-time data, it makes sense to hire React developers, but ask how they handle SEO, since React needs server-side rendering or a framework like Next.js to be indexed well. If the team works remotely, agree on working hours and communication channels in advance.