There is no strategy arm at McKinsey. Working as a generalist you will perform all types of projects (Including operations and strategy).
However, there are separate practices with dedicated experts that have similar or different hierarchies. Ops one has a similar hierarchy.
P.s. Junior Associate is not a very common role at McKinsey in general. Usually, you can:
- Start as a junior associate if you did not perform at the interview well enough for an associate-level / or your work experience is not enough to apply for an associate role
- Be promoted to junior associate if your performance is not good enough directly for an associate