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1. Rate-Limiter Rate-Limiter Public

   Thread-safe Rate Limiter in Java with five algorithms — Token Bucket, Leaky Bucket, Fixed Window, Sliding Window Log, and Sliding Window Counter. Factory pattern for algorithm selection, Strategy p…

   Java

2. Parking-Lot Parking-Lot Public

   Thread-safe Parking Lot System in Java using Singleton with double-checked locking, Strategy pattern for fee and payment logic, and Factory pattern for vehicle creation. AtomicBoolean and synchroni…

   Java

3. URL-Shortener URL-Shortener Public

   Production-ready URL Shortener REST API built with Java 17 & Spring Boot 3. Features JWT stateless auth, BCrypt, Redis caching, Bucket4j rate limiting (429), URL expiration (410), click analytics, …

   Java

4. E-Commerce E-Commerce Public

   Java