Java

How many microservices were there, how did everything spin and scale?

What caused the latency to drop from a second to 300 milliseconds?

When changing a contract, is a new accrual added?

Tell about reducing database load by 30% — what was done?

What error can occur when using field injection at service startup?

What are the default fetch types for entity relationships in Hibernate (EAGER or LAZY)?

How many partitions were usually in each topic?

Tell about the team and process from task setting to deployment.

Design task: The Like service writes likes to Kafka, and the Dashboard service should calculate the post ratings. How to establish interaction?

What are the ways of dependency injection in Spring?

What is a HashMap and how is it structured internally? What is the get operation speed?