Pros
Company welcomes newbies to ask questions, therefore good to improve SDE skills.
Flexible meeting times with your mentor.
Mentor super nice and supportive, patient, and always available. (My workflow: get issue from github, solve it, report back. There are many type of issues you can pick and work on. They mostly clear in intrsuctions. So all you will have to do is implement them)
Flat structure. No need to be afraid to approach anyone.
Cons
company works with Trinet for payroll system which can be tedious to set up yout account. Took me a lot of time in the first week.