What red flags and green flags are important to you in a future workplace?
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C#
Explain the principle of Dependency Inversion from SOLID.
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Do you live in Moscow?
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Can you tell more about the architecture: is there a big monolith or a modular monolith?
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Task: Events are received from users, each needs to be verified in an external source, but it does not respond immediately. Implement VerificationService which: - Accepts events from users - Tries to verify each by contacting an external service - If the response is PENDING, retries sending this event no earlier than 5 seconds later - Maximum 3 attempts, after which the event ID is output to stdout with status FAILED - Successfully processed events are output to stdout with status VERIFIED The templates and stubs of external dependencies are already implemented: 1. VerificationStatus 2. Event 3. VerificationResult 4. IExternalSource public enum VerificationStatus { OK, Pending, Error } public record Event(string Id, string Payload); public record VerificationResult(VerificationStatus Status, string? Message = null); public interface IExternalSource { VerificationResult Verify(string eventId); } public class VerificationService { private readonly IExternalSource _externalSource; private const int MaxAttempts = 3; private static readonly TimeSpan RetryDelay = TimeSpan.FromSeconds(5); public VerificationService(IExternalSource externalSource) { _externalSource = externalSource; } // TODO: implement }
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How do async and await work under the hood in C#?
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What happens when waiting for the first completed task with Task.WhenAny while other tasks are still running?
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public class A { public virtual void Print1() { System.Console.Write("A"); } public void Print2() { System.Console.Write("A"); } } public class B : A { public override void Print1() { System.Console.Write("B"); } } public class C : B { public new void Print2() { System.Console.Write("C"); } } static void Main(string[] args) { var c = new C(); A a = c; a.Print1(); a.Print2(); c.Print2(); } What will be in stdout?
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Would you be interested in mentoring junior developers?
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Tell us about your professional journey over the past two and a half years: projects, products, tasks, and interesting nuances.
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public struct S : IDisposable { private bool dispose; public void Dispose() { dispose = true; } public bool GetDispose() { return dispose; } } What will be in stdout?
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What enabled the increase in the replication service throughput from about 300 to 700 messages per second? How were ConcurrentDictionary and SemaphoreSlim used?
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Have you dealt with complex SQL query optimization tasks? Have you encountered EXPLAIN ANALYZE?
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How do you evaluate your grade?
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Tell me about the most challenging task you are proud of solving.
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What are the values of Sum and Count?
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If everything goes well and you accept the offer, when will you be able to start? Are there any agreements with your current company or planned vacation?
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How to limit the degree of parallelism when processing a set of asynchronous tasks?
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How to organize waiting for new events if the queue is empty, and what is the difference between Channel and ConcurrentQueue?
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Have you always worked under an employment contract, or have you had/self-employed or are you currently self-employed?
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