The short answer
No. The Conntal screen is a live conversation of about an hour with an engineer who does the job, built around a real production scenario that is published on the role page in advance. There is no take-home project and no unpaid work, and candidates who do not pass are told specifically why.
No. The practitioner screen takes about an hour, and it is a real conversation with an engineer who does your job. There is no take-home project and no unpaid work.
The scenario is published on the role page before you apply, so you can see the bar in advance. Preparing for it is fine: it is judged on how you sequence an incident and what you ask before acting, which preparation does not fake.
If you do not pass, you are told why, specifically, by the person who made the call. Most staffing firms cannot offer that, because their screen was a keyword match and there is nothing to explain.