Pros
The people are generally very lovely, open and caring. For some people, Frontier is an incredibly accommodating and supportive environment (considerably more so than other employers). The values are used very well and well engrained into the way the company works.
Cons
The balance of work and pay is not right; the company talks a lot about flexible working, but it can be incredibly hard to make use of this (e.g. when the workload is persistently high, how can you work less?) and so there's little compensation by way of better hours (compared to working anywhere else). Salaries are in some ways very competitive, but role descriptions can be incredibly broad and salaries often don't capture the breadth of a role meaning it is quickly possible to become underpaid. It is very easy to feel undervalued at Frontier - the routine of back to back projects and day-to-day work without celebration, thanks or recognition can be extremely demotivating.