Hi, I'm Anupam Chaubey.

A surplus food rescue engine connecting donors with shelters, built to handle concurrent claims and prevent double-booking.

• Concurrency Control: Implemented JPA Optimistic Locking (@Version) to eliminate race conditions when multiple shelters claim the same food batch simultaneously.
• Stateless JWT Invalidation: Combined stateless JWT with an active database token blacklist for instant logout session revocation.
• Lifecycle Sweeper: Automated background cleanup using Spring @Scheduled to mark expired batches every 60 seconds.

Backend university networking and resource-sharing platform for notes, previous papers, and interview experiences.

• Authentication & Authorization: JWT authentication with BCrypt hashing and role-based access control (Student and Admin roles).
• Resource Filtering: REST APIs supporting pagination, multi-criteria search, and filtering by semester, branch, and subject.
• Cloud Assets & Docs: Integrated Cloudinary for file attachments and documented 15+ endpoints with Swagger/OpenAPI.

Full-stack social blogging platform inspired by Medium, focusing on backend authorization and social graph features.

• Post Visibility: Enforced access rules (Public, Followers Only, Private) directly at the service layer to prevent data leakage.
• Social Graph: Implemented follow request and approval workflows with notification events.
• Document Persistence: Built with Spring Boot and MongoDB for story storage and tag-based searching.

A secure task-management REST API built with Spring Boot and layered architecture.

• Data Isolation: All CRUD operations are strictly user-scoped to the authenticated JWT principal.
• Clean Architecture: Decoupled layers with DTO abstraction, Bean Validation, and centralized exception handling.