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How to prepare for case interview for internal corporate strategy role at professional service firm?

Hi everyone! 

I have a case study interview coming up next week for an internal corporate strategy role at a Professional Services Firm. I've been told that it will be completely verbal, 45 minutes to solve a business problem. There is math involved, but they really will want you to talk through how you would approach the problem, what information you want, considerations, etc. From what I've learned, the team prioritizes financial modeling/planning skills, with a focus on long-term planning. 

Could anyone advise me on how to prepare for a case interview for an internal corporate strategy role? What types of cases should I practice more? (market sizing, profitability, etc.). Any areas I should talk about more when laying out my structure?

Would really appreciate your insights—thanks in advance!

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Pallav
Coach
vor 14 Std
Non-target expert | Ex-BCG | >200 cases

What to Expect

  • It’s verbal, 45 mins, focused on strategic thinking, financial planning, and long-term impact.
  • Less about classic consulting structures — more about real-world business judgment.

Key Areas to Prepare

  1. Strategic Planning – Should we expand? Invest? Cut costs?
  2. Financial Modeling – Talk through revenue, cost, ROI, breakeven.
  3. Internal Feasibility – Capabilities, team structure, hiring.
  4. Implementation Risks – Org change, buy-in, cultural fit.

Structure Example

For a “new service launch” question:
 

  1. Strategic Fit
  2. Financial Viability
  3. Operational Readiness
  4. Risks/Trade-offs

Tips

  • Think like an internal advisor: practical, grounded, and implementation-focused.
  • Practice talking through numbers and making assumptions out loud.
  • Read up on the firm’s strategy, offerings, and pain points.
Evelina
Coach
vor 12 Std
EY-Parthenon (7 years) l BCG offer holder l 7+ years coaching l 10% off first session l free 15' intro call l LBS

Hi there,

Thanks for your question—this sounds like a classic internal strategy case with a slightly more financial and long-term planning tilt. Here’s how I’d recommend preparing:

1. Focus on corporate-level cases
Internal strategy teams typically work on portfolio optimization, long-term growth planning, business model shifts, and org design—less on granular operational issues. Prioritize practicing:

  • Growth strategy (organic vs. inorganic)
  • Market entry / expansion
  • Portfolio rationalization (which business units to scale, fix, or exit)
  • Cost optimization and margin improvement (especially in a services context)

2. Master your structure: top-down and hypothesis-driven
Since this is a 45-minute verbal case, you’ll need to keep your structure crisp and communicative. When laying out your approach, make sure you:

  • Break the problem down into MECE buckets (e.g., market, internal capabilities, financials, risks)
  • Proactively share what data you’d need (e.g., segment-level revenue/margin trends, client mix, utilization)
  • Talk about financial implications early—how the problem connects to P&L or long-term business value
  • Include long-term strategic fit in your framework, not just short-term profitability

3. Brush up on financial modeling thinking
They’re not expecting you to build a model on the spot, but you should be able to:

  • Walk through how you’d build a simple revenue or cost forecast
  • Talk about value drivers (e.g., pricing vs. volume vs. mix)
  • Interpret and discuss basic P&L or ROI figures

4. Practice articulating your thought process out loud
Since it’s a verbal case, clarity matters more than writing. Practice talking through:

  • How you’d approach an ambiguous brief
  • What questions you’d ask
  • How you’d test hypotheses
  • How you’d assess trade-offs and make a recommendation

5. Optional: Prepare a few tailored questions
At the end, they may leave time for you to ask questions. Given it’s an internal role, asking about how the strategy team interacts with business units or how long-term planning influences execution could be a good idea.

Happy to help you prep – feel free to reach out.
 

Best, 

Evelina

Julia
Coach
vor 12 Std
Ex-McKinsey Engagement Manager in US and Europe | 3 Years+ Interviewer | Columbia MBA | Strategy & Fit Coach

Hi! Just wanted to chime in and tie together the great advice already shared here 😊

I have served multiple Professional Services Firms and worked with their strategy teams. They were all very solid so I’m sure you’ll enjoy the work and environment! For this interview I’d focus on:

1. Structure matters (a lot). You won’t need fancy frameworks, but you will need to be clear, top-down, and logical. Think of breaking your approach into buckets like:

  • Strategic rationale
  • Financial impact (P&L, ROI, long-term value)
  • Operational feasibility (internal capabilities, people)
  • Risks and trade-offs

Practice talking through your structure smoothly and out loud: THIS IS KEY! 

2. Financial thinking is expected, even if it’s not technical. They won’t ask you to model in Excel, but they’ll want to hear how you’d think through revenue, costs, breakeven, and long-term impact. Be ready to make assumptions and talk about drivers (e.g., pricing vs. volume). Even being able to sketch how you’d build a forecast helps.

3. Case types to focus on:

  • Growth strategy (new service, market entry)
  • Portfolio choices (what to scale, fix, or cut)
  • Cost/margin improvement in a service-based business
  • Long-term planning / organizational feasibility

4. Speak like an internal advisor. Less “consulting jargon” and more grounded judgment. They’ll want to see that you can think practically and communicate clearly, especially when walking through numbers or ambiguity.

If you’re short on time, one of the best things you can do is practice talking out loud with someone (can be a friend whose judgement you trust, or someone who’s in the industry!) That’s often what makes the biggest difference in verbal-heavy interviews.

Good luck!! 

Ankit
Coach
vor 19 Std
Ex-McKinsey | Personalized Case & Resume Coaching | Non-Target Coaching | 50% off First Session | PEI Storytelling

Hi There,

Congrats on getting an interview! There are multiple things that you can do to help you prep for this case. One disclaimer that I will point out is that (I am assuming you have never done a case before) getting proficient in casing takes a good amount of prep and with only about a week you will be in a time crunch. However, there are ways to prioritize to prepare for this specific interview.

1. Research: You need to spend some time to better understand what this specific firm's interview process looks like. They may have a specific type of case that is standard for their interview process (e.g., Market Sizing)

2. Generic Preparation: In parallel with your research, I would recommend trying to familiarize yourself with how a case interview looks like. Resources like Victor Cheng can be a good & quick way to get an introduction to the casing content.

3. Running Mocks: There are 3 ways to run a case and I would try to start ASAP. You can find either a friend or a peer through this platform to case you, you can run through a case yourself (I would recommend doing this a couple of times to gain a baseline of experience of how a case works), and casing with a coach. Without trying to sound upselly, I think a couple of sessions with a coach at the minimum can really help you move the ship in the right direction, especially if you are looking at Strategy/Consulting roles as your next job.

4. Mental Math: Sounds like from your description that this role leans heavy on the financial analysis side. I would make sure you feel comfortable doing calculations without a calculator and knowing generic formulas like how to calculate a breakeven analysis. There are resources on this site and online on case math.

A week is definitely a short turnaround if you are starting from scratch, so I would definitely try to narrow your focus as much as possible through your research.

Hope this helps and happy to chat on how to maximize your prep and run some cases!

Best of Luck!

-Ankit A.

vor 10 Std
#1 Rated McKinsey Coach | Top MBB Coach | Verifiable success rates

Based on your description, this sounds like a classic case study interview.

Check out the case library here on the website. 

Also, have a look at a couple of my cases as well, which include detailed interviewer notes:


Try doing a couple of mock cases with peers on the platforms and then feel free to reach out to me with the feedback that you're receiving and I can give you my perspective on how to work on it.

It might also help if you reach out to some people already working in that firm, and getting an understanding from them of 'what made them successful in the interview'. So, in that sense, you shouldn't ask what they received as questions during the interview - since that is likely to make them uncomfortable and clam up - but rather to give you a sense of how they went about their prep.

Best,
Cristian

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