Tell us about your experience working with distributed system architecture, databases, sharding, and replication. Have you been involved in designing architecture or only working with ready-made solutions?

In my experience working with distributed systems, I have been involved in both designing architecture and operating ready-made solutions. For example, when developing a high-load service in Go, I designed a system using microservice architecture, where each service had its own database.

To ensure scalability, data sharding by user key was used, which allowed for evenly distributing the load across nodes. Database replication was employed to increase fault tolerance and enable fast reads, using asynchronous replication to minimize write latency.

I also worked with systems that used ready-made solutions, such as PostgreSQL with built-in replication and clustering, as well as NoSQL databases supporting sharding, like Cassandra. In such cases, my tasks included configuration, monitoring, and performance optimization.

Thus, my experience covers the full cycle: from designing architecture of distributed systems considering sharding and replication to operating and maintaining ready-made solutions.