General knowledge about Scala, K8s, Postgres & the tech stack
Scala Developer Interview Questions
135 scala developer interview questions shared by candidates
Q: Why is it bad to block threads in JVM
Functional Programming vs Object Oriented Programming, Kafka Topic vs Partition and general IT knowledge questions
Hamiltonian Path problem, Basics of Immutability vs Mutability and how does all of this fit on JVM, JVM basics, Some DS questions based on their day to day work. Discussion around the databases that you have worked on
Got a coding challenge where I was supposed to build an application from scratch. App should receive commands for creating a canvas, drawing lines, rectangles and Bucket fill. I used 1 1/2 day on this. This was apparently not enough since this was the feedback: * readme has design discussions Well, I have to convey my thoughts to you somewhere don’t I? Is that a MAJOR problem? * some validation working * reverse lines/rectangles work * (some) graphical acceptance tests * readme has no run instructions Is that a MAJOR problem? * easy to cause crash with incomplete/invalid commands: 'C' or 'L -1 -1', 'C 10 -1’ Sorry should have tested for negative values, easy to fix in one place. * can't refill or fill lines Is that a MAJOR problem? * test named: '"App" should "have tests"' with implementation: true should === (true) * no test coverage apart from acceptance tests (which don't exercise full set of commands) Is that a MAJOR problem? * control loop logic intermixed with parsing * canvas operations return an array of strings instead of the canvas. Sorry, this is unnecessary since I use toStringArray() later anyway so toStringArray is executed twice. * sealed class with "getters" used instead of case class Is that a MAJOR problem? * no encapsulation of fields or private methods within classes (Canvas/Cell) Obviously these was major concerns. ALL tests should be done and ALL possible errors should be catched. I think is is VERY much to demand for a initial coding challenge. Should you put one week of work to be able to talk to the company?
Experience
Demoed a framework in Scala and Akka Persitence I have written. Response from manager was: I did not seam to be excited over my code I am VERY sorry about that, I had been awake for 12 hours after going up at 3 a’clock to catch a early flight to Amsterdam. These manager bastards are the worst.
Type classes, Kafka infrastructure, Tagless Final, IO
How do you troubleshoot memory errors on the JVM?
- Talk about what is a transaction (formal way) - Explain CI/CD and how that is integrated with Jenkins - Talk about the java versions new features - question about scala ADT, patterns, case classes, monads and functors
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