Java

The client sees the old balance after a successful withdrawal yesterday. What could be the reason?

On which project did you work at [company]?

What is PECS and when to use extends/super?

Push vs Pull approach in message brokers (ActiveMQ vs Kafka). Pros and cons of each.

How to ensure reliability when paying for a mobile phone (deduction on our side + charging at MTS)?

Tell me about your current experience and tech stack.

What are Service Discovery tools used for?

How to safely stop a thread in Java?

Architectural task: a deferred notifications system for bonuses (tens of millions of users)

What alternatives to Spring do you know?

How does TLS/HTTPS work? What is encrypted, how does the handshake occur?

Tell about OOP — what is it, what is it for?

What is the main difference between ForkJoinPool and other pools, and what mechanism does it use?

How many people were in the team at [company]?

Why do you consider job offers? What is unsatisfactory at your current job?

What project did you work on at Gazprom Neft? What did you work on?

How have you optimized SQL queries?

What work format do you consider and from which city do you plan to work?

The client clicked 'Withdraw funds' twice. How to prevent double deduction at the microservice and Kafka level?