SSH Level Access within VPS

We have a few developers who are in charge for 40  or 50 or 100 websites with us and I cannot give them 40 SSH logins instead would like to give them one access

Same happens for Account Managers per customer & a customer can have 10 or 20 domains hosted on a vps and that vps can have 100 domains which belong to multiple customers

so if i have one VPS
with 10 customers
and each customer has 30 sites
I should be able to can create multiple users  and cherry-pick which website which user can see so that they get access to those websites only instead of giving multiple users multiple spanel or SSH logins which becomes hard to manage

Challenges we face today:

If a developer leaves we need to change SSH logins for each and every domain

If a developer is incarge of 100 sites we give them 100 SSH logins it shouldn't be this way he should have one login and see all the sites he/she is responsible for and whe the developer leaves we just disable one login and that will disable all 100 sites

Also a feature where the owner of the VPS can see each and every single domain via SSH instead of login to multiple SSH, yes I know the new file manager allows you to jump from one SSH to other but still it snot as good as login to putty and put one SSH login and see all teh domains hosted on that vps and be able to navigate between each folder and copy and move this helps in easy maintenance