backend

A deep dive into the key language changes in Java 25, including module import declarations, compact source files, flexible constructor bodies, and primitive patterns.

A practical overview of Java 25 (JDK 25), covering the biggest language, JVM, concurrency, GC, JFR, and security changes from the official OpenJDK release.

Connect Express.js to MongoDB with Mongoose ODM. Learn schema design, CRUD operations, validation, relationships with population, pagination, and build a complete blog API with users, posts, and comments.

Add role-based access control and admin user management to your URL shortener. Implement admin roles, permission middleware, user CRUD operations, account suspension, and admin promotion with Prisma and Express.

Build URL moderation tools, bulk operations, and abuse detection for your URL shortener admin panel. Implement link flagging, bulk status updates, malicious URL scanning, domain blocklists, and automated abuse prevention.

Build system-wide analytics and audit logging for your URL shortener admin panel. Implement dashboard metrics, click trends, top URLs rankings, user growth charts, admin action audit trails, and real-time system health monitoring.

Build a comprehensive testing strategy for your URL shortener. Write unit tests with Vitest, integration tests with Supertest, database tests with test containers, and load tests with k6 for redirect throughput.

Deep dive into URL shortening algorithms. Implement Base62 encoding, handle collisions at scale, support custom aliases, and understand the math behind short code uniqueness and collision probability.

Add Redis caching and rate limiting to your URL shortener. Implement cache-aside pattern for sub-millisecond redirects, sliding window rate limiting, cache invalidation strategies, and Redis connection management.

Build a high-performance redirect engine and click analytics system. Learn 301 vs 302 redirects, non-blocking click tracking, user-agent parsing, geolocation, and analytics aggregation queries with PostgreSQL.