This was a month-long process with 6 rounds. I had applied for the Sr. iOS dev role. First Round: A telephonic round on the networking basics i.e. protocols, DNS, SSL pinning, VPN basics & TCP/SSL handshake steps. Second Round: A telephonic round on the iOS basic i.e. dispatch queues, threads, network extensions etc Third Round: A telephonic round on the analytics, logics and basic networking questions i.e. DNS server etc. Fourth Round: Face to face round in office to write the complex algorithms. Fifth Round: A telephonic round by the engineering director. Sixth Round: A telephonic round by the Sr. HR Manager.