This was a month-long process with six rounds. I had applied for the Sr. iOS dev role.

• First Round: A telephonic round on networking basics, including protocols, DNS, SSL pinning, VPN basics, and TCP/SSL handshake steps.
• Second Round: A telephonic round on iOS basics, covering dispatch queues, threads, and network extensions.
• Third Round: A telephonic round on analytics, logic, and basic networking questions, such as DNS server functions.
• Fourth Round: A face-to-face round in the office to write complex algorithms.
• Fifth Round: A telephonic round with the engineering director.
• Sixth Round: A telephonic round with the Sr. HR Manager.

To write complex algorithms. I was expecting something different as HR told me that this would be a machine test.