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      GridGain

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      Software Engineer Interview

      16 May 2020
      Anonymous employee
      Moscow, Moskva
      Accepted offer
      Positive experience
      Difficult interview

      Application

      I applied through a recruiter. The process took 1 week. I interviewed at GridGain (Moscow, Moskva) in Dec 2019

      Interview

      In December 2019 I received a message from a recruiter on LinkedIn. She had been looking for a Java engineer. We had a phone call and then she organized a technical pre-screening interview. At Glassdoor.com I found the questions they regularly ask in interviews to make myself more prepared. An interviewer asked me about Java core, multi-threading, JVM, and gave a simple task to write code. My answers weren’t perfect, but I didn’t give up and struggled to discover solutions. I didn’t stay quiet and reasoned out loud to show my thoughts. I was motivated and inspired because I wished to make this career switch and enhance my skills. After the pre-screening examination, I wrote out the poorly answered questions. The next day, they called me to make an appointment on Monday. I had been preparing all weekend. My specific focus was on the questions I answered poorly on the prescreening. Also, I downloaded the free version of the product and studied its main functionality. The second interview was tougher. I describe it in detail in the questions sections. Both interviews strengthened me as a specialist. I sent a letter to the recruiter about how I appreciate their time and thanked them for the proposed opportunity. They reached out to me the next day and said that they wish to hire me and proposed to wait two days for a job offer. I was amazed and inspired as well as stayed nervous before receiving the official job offer.

      Interview questions [2]

      Question 1

      Discover the intersection of two sets with size M and size N, algorithm time complexity shouldn’t be more than M+N.
      Answer question

      Question 2

      Java HashMap under the hood; LinkedList vs ArrayList; Java primitives; volatile and final keywords in Java; Communication between threads in Java; Happens-before relationship in Java; Garbage collection;
      Answer question

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