The service processes 100,000 RPS and crashes due to memory. Describe the process of finding the cause and suggest an architectural solution.
Senior
4
Java
14849
265
How to call @Transactional method from within the same bean so that the transaction works?
Senior
4
Describe the lifecycle of a singleton bean in Spring.
Senior
4
How to prevent lost update?
Senior
4
Have you encountered incidents in production, how was the investigation conducted, and what would you do if assigned to resolve a problem?
Senior
4
Where is it better to perform data transformation visible to the client: on the backend or frontend? For example, the calculation of annual interest.
Senior
4
How to make a consumer safe with at-least-once delivery?
Senior
4
How do you feel about requirements like "do it here, but with this change", especially with tight deadlines?
Senior
4
Do you have experience developing backend applications that interact with the frontend?
Senior
4
What was the most high-load case and what was the load in requests or transactions per second?
Senior
4
How to optimize JOINs?
Senior
4
Why are you not working now?
Senior
4
How does a composite index work?
Senior
4
Tell about your experience working with Kotlin.
Senior
4
What would your ideal unit test for mapping a card with about 60 fields, where fields can be missing and value transformations are required, look like?
Senior
4
Was there a strict deadline from the business for this task and did you meet it?
Senior
4
What was your area of responsibility in the project?
Senior
4
How to find and diagnose memory leak?
Senior
4
How to select ThreadPoolExecutor and when to use fixed, cached, single, and scheduled thread pools?
Senior
4
When is it better to use plain JDBC than JPA?
Senior
4