An effective onboarding process involves several levels to ensure a new hire is fully integrated into the team and wider company.
Each level should build confidence and set expectations with the new employee, laying the foundations for how they are to scale the organization.
In 2019, I surveyed 30 engineers working at 20 different companies from an engineering organization I am a member of called /dev/color. These engineers had worked at early-stage startups and Fortune 500 companies where none of the onboarding processes were created equally. This was much due to the complexity of the organizational structure and the value that the organization had put behind onboarding.