Be ready to describe the architecture of systems you've worked on, including: Tech stack: Languages, frameworks, databases, cloud services (e.g., Java, Spring Boot, Redis, Kafka, AWS, etc.). System design principles: Microservices, monolith, event-driven, etc. Scalability & performance: How you handled load, caching strategies, and optimizations. Security: Authentication, authorization, encryption, and data protection. Reliability & availability: HA (High Availability), failover mechanisms, monitoring/logging (Prometheus, Grafana, ELK, etc.).

1 - They asked me about rate-limiting in microservices system. 2 - They asked me about failures between microservices and monolith. 3 - They asked me about load balancing.