Backend

Server-side development and APIs

Filter by difficulty:

Runtime environment, modules, npm, and async programming.

RESTful design principles, endpoints, and HTTP methods.

PostgreSQL, MongoDB, data modeling, and query optimization.

JWT, OAuth, sessions, and access control patterns.

Schema design, resolvers, queries, and mutations.

Microservices, load balancing, and scaling strategies.

Versioning, pagination, error handling, and documentation.

Redis, CDN, HTTP caching, and cache invalidation.