Java

What are the ways to ensure idempotency?

Senior

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Can you explain the concept of IoC container in Spring and its role in dependency management?

Junior — Middle

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What methods and approaches are used to identify the causes of system performance degradation as load increases?

Middle — Middle+

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What does the @Transactional annotation provide in this context? Will it help if an external service fails?

Senior

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Can you explain how the memory model works in Java and what are its main principles?

Junior — Middle

EAGARТ-БанкООО Антара+1

How to understand that there is a connection pool problem? How does it manifest for an application?

Senior

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How do you analyze execution plans and optimize PostgreSQL queries?

Middle+

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What could be the reasons for low database utilization but slow application?

Senior

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What is the purpose of SELECT FOR UPDATE? What level of locking does it provide? Are there weaker options?

Senior

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The marketplace system slowed down under load. Suspecting a database issue. What will you look for?

Senior

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What situations can lead to a ConcurrentModificationException in a single-threaded environment?

Junior — Middle

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What methods exist for checking cache contents during an error in a service?

Junior — Middle

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How to make sending invoices to an external system more reliable? So that when the payment service is unavailable, the client can still reserve a seat and pay later (within 10 minutes).

Senior

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How to lock a database record so that no one else can make conflicting changes?

Middle+

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How to make parallel calls to multiple services to generate a report?

Senior

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How can you guarantee the accuracy and consistency of data during simultaneous crediting and debiting operations without changing transaction isolation level settings?

Junior — Middle

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Can you explain what Spring is and what it is used for in Java development?

Junior — Middle

AstonУдобный СофтМВидео+10

ArrayList vs LinkedList for sequential iteration over 100 million elements — which is preferable?

Senior

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What approaches can be used to improve the efficiency of a service that performs four independent HTTP requests to different systems simultaneously?

Junior — Middle

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What can lead to a slowdown in data insertion into a database after creating indexes?

Junior — Middle

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