Java

There is a system that allows users to work with files in the browser. The stack is standard: Java, Spring, React, Postgres. Files are stored in the file system on the backend, file metadata in the database. The team implemented a feature - renaming a file. This method is essentially key for renaming a file on the backend. A review is needed to identify potential issues in the existing code and suggest ways to fix them. @Transactional public void process(String oldName, String newName) { Long id = exec("select id from file where name='" + oldName + "'"); processFile(oldName, newName); // renaming the file on disk exec("update file set name='" + newName + "' where id = " + id); }

Middle+

СБЕР

What is the time complexity of obtaining an element by its index in an array list?

Junior — Middle

СБЕРIT Oneайтеко

Does Kafka topic have FIFO property?

Senior

СБЕР

Tell us about your testing coverage and approach to testing in your team.

Senior

СБЕР

How did you configure the logic for reading from Dead Letter Queue and where is the ack (manual acknowledgement) done?

Senior

СБЕР

What indexes have you had to use (including covering indexes)?

Senior

СБЕР

How do Virtual Threads work?

Senior

СБЕР

Task: Given two lists, output the elements of the first list that are not in the second. Write a solution in Java.

Senior

СБЕР

What types of relationships in Hibernate do you know and how to describe them? What entity states exist?

Senior

СБЕР

Why should countStock be synchronous rather than asynchronous?

Senior

СБЕР

Features of using @Transactional in Spring. Transaction isolation levels.

Senior

СБЕР

Did you have to work on a state machine for this task?

Middle+

СБЕР

Did all team members participate in the code review process?

Junior — Middle

СБЕР

Have you encountered the problem of distributed transactions? Tell us about the Saga pattern.

Senior

СБЕР

What is the purpose of the volatile keyword?

Senior

СБЕР

Name three differences between REST and SOAP.

Senior

СБЕР

Tell about design patterns — why they are needed, what groups, examples.

Senior

СБЕР

How does Kafka work with multiple application instances? What is a consumer group, partitions, rebalancing?

Senior

СБЕР

What is the difference between using Hibernate and direct interaction with the database via JDBC?

Junior — Middle

ВТБСБЕРМеталлИнвестБанк

Choose a design pattern for a logging system (in DB, text file, via request)

Middle

СБЕР