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      Mobile Developer Interview

      17 Apr 2026
      Anonymous interview candidate
      Kraków
      No offer
      Negative experience
      Difficult interview

      Application

      I applied online. I interviewed at AVSystem (Kraków) in Oct 2025

      Interview

      The interview was the second stage of the recruitment process, focusing heavily on technical skills. It was divided into three main segments: Live Coding: I was given a task (sent via PDF) to complete in real-time. Afterward, we did a deep dive into my code, discussing my design decisions and potential improvements. System Architecture: I had to design a live chat system with a troubleshooting bot for router issues. Key requirements included offline access for ongoing chats and high scalability (handling 1 million users) using caching, local databases, WebSockets, and load balancing. Technical Q&A: A comprehensive discussion on Flutter and Dart internals, focusing on performance, state management, and native communication. The process was professional and very demanding, testing both hands-on coding and high-level architectural thinking.

      Interview questions [3]

      Question 1

      Can you explain how setState() works "under the hood" and describe the three trees in Flutter?
      1 Answer

      Question 2

      How would you handle app scalability and performance for a million users, specifically regarding offline support?
      1 Answer

      Question 3

      What are the different types of Method Channels and how do you run background tasks in Flutter?
      1 Answer

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