Have you ever dealt with performance issues and non-functional requirements?

Yes, I have encountered questions related to performance and non-functional requirements. For example:

• Performance: Optimizing system response time, reducing request processing time, increasing throughput. This involved analyzing bottlenecks (profiling), optimizing algorithms, using caching, load balancing.

• Non-functional requirements: Reliability, scalability, fault tolerance, security, ease of maintenance.

Example: when developing a web application, it was necessary to handle a large number of concurrent users. To achieve this:

• Designed architecture with horizontal scaling.
• Implemented caching of frequently requested data.
• Used asynchronous calls to reduce blocking.
• Set up monitoring and alerting for quick response to failures.

Thus, non-functional requirements influence the choice of technologies, architecture, and development methods to ensure the system is not only functional but also efficient, reliable, and easy to operate.