Multi-region architecture distributes your application across multiple geographic regions to achieve low latency for global users, high availability during regional […]
A notification system delivers timely information to users through multiple channels — push notifications, email, SMS, and in-app messages. Companies
Data serialization determines how structured data is encoded for storage and transmission. The choice between JSON, Protocol Buffers, Avro, and
Capacity planning and back-of-envelope estimation are essential skills for system design interviews. Every design decision — whether to use a
Full-text search is a core feature of most applications — from e-commerce product search to log analysis to knowledge base
Continuous Integration and Continuous Delivery (CI/CD) pipelines automate the path from code commit to production deployment. A well-designed CI/CD pipeline
Probabilistic data structures trade perfect accuracy for dramatic space savings. A Bloom filter can test membership in a set of
Concurrency questions test your understanding of parallel execution, synchronization, and the subtle bugs that arise when multiple threads share state.
Web security is a core competency for every backend and full-stack engineer. Security vulnerabilities are consistently the most expensive bugs
Message queues are the backbone of asynchronous communication in distributed systems. Choosing the right message queue and understanding its guarantees
Understanding network protocols is fundamental to designing performant distributed systems. Every API call, database query, and cache lookup traverses the
Containers are the building blocks of modern cloud-native applications. Understanding how Docker works internally — Linux namespaces, cgroups, layered filesystems,
SQL query optimization is a critical skill for backend engineers and appears frequently in database-focused interviews. Understanding how the query
Generating unique identifiers in a distributed system is a surprisingly complex problem. A simple auto-incrementing integer does not work when
Object-oriented design questions test your ability to model real-world systems using classes, interfaces, and design patterns. These questions appear frequently
