Although the best way to build booking apps is custom app development but these coders charge very high. That is why I prefer to hire a frontend developer and get low-code backend services from different vendors including Firebase, Back4App, Kinvey, Airtable and much more. If you are interested to explore these low code backend vendors then should check the compatibility of these platforms with your project.
Low code backends are beneficial because they lower development costs and your time to market. Secondly, most of them cost you for the used resources under its pay-as-you-go pricing policy.