Optiva interview questions

I applied through a referral of a previous employee. There were 5 rounds. 4 of them technical, 1 HR. All interviews were around 45-60 minutes each. All taken by different senior employees of the existing team. last technical round was taken by hiring technical manager. I come from a telecom background.

Interview process was simple, I had three rounds, 1. with a senior team member Basic knowledge of telecom domain, Unix knowledge(Shell commands , but bit good knowledge is expected) SQL knowledge 1-2 puzzles to check your aptitude 2. with Manager Kind of a HR round Day to day activity? what you are looking for? what are your strength and weakness? Why leaving your previous company? Some puzzle. 3. Director just formality Why need change? Expected salary? and just kind of discussion