Deloitte does a lot of implementation of systems designed by the more traditional consulting firms. This means that staffing needs could arise at anytime during the year.
Many Big 4 positions are baptism by fire. Ask your co-workers & mentors for help.
P.S. Math is a tremendous background for data analysis/data analytics. The University of Mississippi & seven or eight other large universities have a special relationship with KPMG. KPMG developed the program. Most–almost all–participants in the KPMG data analytics masters program receive full scholarships & a living stipend with a “guaranteed” job awaiting when one completes the 10 month program. Participating schools include Ole Miss,Ohio State, Texas A&M, ASU, Villanova, Virginia Tech, USC, Univ.of Missouri,Univ. of Georgia, & Baylor. (I believe the program was started at Ole Miss. I would check the benefits at Baylor as the benefits may be greatly reduced.)