Secure Java Web App

I’m planning a new website and want it built end-to-end with the tools I already trust—Java, Spring Boot on the server, ReactJS on the client, and either MySQL or MongoDB for persistence. The single non-negotiable... (Budget: ₹750 - ₹1250 INR, Jobs: J2EE, Java, JavaScript, JSP, MySQL, React.js, REST API, Spring Boot)