McKinsey & Company Interview Guide
Pass the McKinsey interview: structure, cases, and PEI prep.
Présentation
McKinsey's interview process is among the most rigorous in the world. It combines case interviews testing structured problem-solving with the Personal Experience Interview (PEI), which assesses leadership, personal impact, and entrepreneurial drive. Candidates typically face two rounds, each with two interviewers.
Le processus de recrutement
Online application & CV screen
CV reviewed for academic excellence, leadership roles, and measurable impact. McKinsey values top-decile academic performance alongside evidence of leadership outside the classroom.
McKinsey Solve (Imbellus assessment)
A gamified problem-solving assessment lasting around 60–70 minutes. Tests systems thinking, data analysis, and decision-making under uncertainty, not domain knowledge.
First round interviews (2 interviews)
Each interview is 45–60 minutes: roughly 30 minutes of case interview plus 15 minutes of PEI. Cases test structured frameworks, quantitative reasoning, and hypothesis-led thinking.
Final round interviews (2–3 interviews)
Same format but with senior partners. Cases are more ambiguous and senior interviewers will probe your recommendations harder. PEI stories must be leadership-focused with clear personal impact.
Compétences clés évaluées
Questions d'entretien courantes chez McKinsey & Company
Q: “Tell me about a time you led a team through significant uncertainty. What did you personally do, and what was the outcome?”
Comment répondre
This is a PEI question. McKinsey wants to see YOUR actions, not the team's. Use first-person throughout. Quantify the impact and be specific about the moment you changed the trajectory.
Q: “Our client is a UK supermarket seeing a 15% margin decline over three years. How would you approach diagnosing this?”
Comment répondre
Open with a structure before diving in. A good opener: 'I'd want to understand whether this is a revenue or cost issue first.' Then branch into revenue drivers (volume, price, mix) vs. cost drivers (COGS, SG&A, logistics).
Q: “Tell me about a time you had to persuade a senior stakeholder who disagreed with your recommendation.”
Comment répondre
McKinsey values intellectual courage. Show that you held your position with evidence, not just deferred. Describe the specific data or argument that changed the dynamic.
Q: “How many piano tuners are there in London?”
Comment répondre
A classic estimation/Fermi question. Structure your approach: population → households → piano ownership rate → tuning frequency → time per tuning → tuners per hour. Show your reasoning clearly. The number matters less than the method.
Conseils d'initiés
Structure before content: always pause to lay out your framework before answering. Interviewers assess how you think, not just what you conclude.
Lead with a hypothesis: McKinsey's culture is hypothesis-led. Say 'I think the issue is X, and here's why I'd test that first.'
Be specific in PEI stories: avoid 'we did X'. Every sentence should have 'I'. McKinsey is assessing your personal leadership, not your team's performance.
Ask for data: in case interviews, good candidates ask for specific data to validate or challenge their hypothesis. Passively accepting all information is a red flag.
Practise mental maths: expect to work with numbers in your head. Practice multiplying and dividing large numbers quickly and confidently.
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