Please Dm only when Developer with 4+ years of experience in Java Can connect offline places if u r nearby (Hinjewadi,wakad,Pimple Saudagar,pimpri, chinchwad) I need a Java-based backend whose sole purpose is controlling who can see and do what inside an admin portal. Think of it as the engine for authentication and fine-grained authorization; the front-end will call your APIs to sign users in, assign them the correct privileges, and block anything they are not entitled to. I am leaning toward Spring Boot with a familiar security stack (Spring Security, JWT or OAuth2), but if you have a cleaner Java solution I’m open to hearing it. The service must expose well-structured REST endpoints, persist its data reliably, and be easy for another developer to plug into a React admin UI later. Deliverables • Source code in a public or private Git repository • Clear README with build/run instructions • Postman (or similar) collection that shows happy-path login and a couple of unauthorized scenarios • Basic unit tests covering the main auth flows Acceptance criteria 1. A new user can register or be created and immediately authenticate. 2. After authentication, the API returns a token that protects subsequent requests. 3. A protected endpoint denies access when the token is missing, expired, or carries the wrong role. Tell me how you would structure the project, what libraries you prefer, and roughly how long you’ll need.