Author: Taylor Warfield, Former Bain Manager and interviewer

Last Updated: July 9, 2026

 

LEK case interviews are candidate-led, quant-heavy, and capped by a unique 60-minute written case that McKinsey, BCG, and Bain do not use. This guide covers the full LEK interview process, every case type you will face, real LEK case examples, and a week-by-week plan to land your offer.

 

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Key Takeaways

 

LEK runs two interview rounds: a first round with two 30-minute candidate-led cases and a final round with two 30- to 40-minute cases plus a 60-minute written case.

 

• Every LEK case is candidate-led, so you choose what to explore and propose each next step

 

• LEK cases are more quantitative than most firms, with heavy data tables, charts, and multi-step math

 

• The 60-minute written case asks you to select 7 to 10 slides from a large packet and write insight-driven headlines

 

• Ground every recommendation in data, since LEK describes its rigor as grounded in evidence, not opinion

 

• Based on 2026 Glassdoor data, the process averages 19 days from first interview to decision

 

• Most successful candidates prepare for four to six weeks and practice 15 to 25 cases

 

What Changed in 2026?

 

LEK has kept the same two-round interview format, but the firm itself has grown to 27 offices across 16 countries with more than 2,300 employees, according to LEK's own 2026 figures. Interview timing data has also been refreshed: Glassdoor now reports a 19-day average from first interview to decision across 551 reported interviews. All salary-free process details, case examples, and tips below reflect what candidates are seeing in 2026.

 

What Is the LEK Interview Process?

 

The LEK interview process has two rounds. The first round is two 30-minute interviews with a candidate-led case in each, and the final round adds two 30- to 40-minute interviews with senior staff plus a 60-minute written case. Based on 2026 Glassdoor data, the process averages 19 days from first interview to decision.

 

Here is what to expect at each stage.

 

What happens before LEK interviews?

 

Before you reach the interview stage, LEK screens candidates in two ways. First, recruiters review your resume and cover letter for academic performance, analytical experience, and evidence of impact. In my experience helping candidates apply, a resume that quantifies results is the single biggest driver of getting past this screen.

 

Second, some offices require a LEK digital assessment, a game-based aptitude test of roughly 10 minutes that measures mental math, pattern recognition, and logical reasoning. LEK added this step to its application process in 2020. Not every office uses it, but you should be ready for it.

 

What happens in LEK first round interviews?

 

LEK's first round includes two back-to-back 30-minute interviews, each led by a different interviewer, typically an Associate or Consultant. Expect roughly 20 minutes of case and 10 minutes of introductions and fit questions in each session.

 

One case is usually heavy on quantitative analysis, such as market sizing or profitability math. The other tends to be more qualitative and strategic. Both are candidate-led, meaning you drive the analysis and decide what to explore.

 

What happens in LEK final round interviews?

 

The LEK final round interview is more intensive than the first round. You will have two 30- to 40-minute case interviews with Managers or Partners plus the 60-minute written case. The oral cases follow the same format as round one, but senior interviewers push harder on your reasoning and test how you respond to challenge.

 

Stage	First round	Final round
Number of interviews	2 interviews	2 oral + 1 written case
Duration	30 minutes each	30 to 40 min oral, 60 min written
Interviewers	Associates and Consultants	Managers and Partners
Case style	1 quant-heavy, 1 qualitative	Advanced cases + slide presentation
Fit questions	Brief, 5 to 10 min per interview	Brief, embedded in case sessions

 

How long does the LEK interview process take?

 

Based on 2026 Glassdoor data from 551 reported interviews, LEK's hiring process averages 19 days from first interview to decision. The full journey from application to offer typically takes two to three months when you include resume screening and any aptitude tests. LEK usually notifies candidates within one to two weeks after the final round.

 

What Does LEK Look for in Candidates?

 

LEK evaluates candidates on four core dimensions: analytical ability, structured thinking, communication, and business judgment. In my experience coaching hundreds of candidates, understanding these criteria lets you tailor every answer to what the interviewer is actually scoring.

 

• Analytical ability: can you interpret data, perform mental math accurately, and draw conclusions from numbers? LEK cases carry more data than those at most other firms

 

• Structured thinking: can you break an ambiguous problem into clear, logical buckets? LEK wants organized, MECE thinking from your very first framework

 

• Communication: can you explain findings simply and concisely? LEK values candidates who synthesize analysis into business-ready language

 

• Business judgment: do your assumptions make sense? Prioritize what matters most and avoid getting lost in irrelevant details

 

On its own website, LEK describes its analytical rigor as grounded in evidence, not opinion. Throughout your interviews, anchor every recommendation in data with phrases like "the data suggests" or "based on the analysis." This single habit separates strong candidates from average ones.

 

How Do You Solve a LEK Case Interview?

 

You solve a LEK case interview by verifying the objective, building a tailored framework, stating a hypothesis, testing it with data, and closing with a firm recommendation. Every LEK case is candidate-led, so you drive the conversation from start to finish. Here are the six steps.

 

1. Understand the case: the interviewer reads you the case background. Take detailed notes on the company, the situation, and the specific business problem you need to solve
   
   
2. Verify the objective: misunderstanding the question is the fastest way to fail. Paraphrase the objective back to the interviewer and ask clarifying questions before moving forward
   
   
3. Create a framework: ask for a moment to structure your thoughts. Strong case interview frameworks have three to four categories tailored to the specific case, never a generic memorized template
   
   
4. Develop a hypothesis: state an initial hypothesis, your educated guess at the answer. It will change as you gather data, but it gives your analysis direction
   
   
5. Test your hypothesis: this is where you spend most of the case. Ask for specific data, do the math, interpret charts, and explain how each answer affects your hypothesis
   
   
6. Deliver a recommendation: end with a clear answer supported by two or three key reasons from your analysis. Include next steps you would explore with more time

 

If you want to learn case interviews quickly, my case interview course walks you through proven strategies for each of these six steps in as little as 7 days.

 

What types of cases does LEK use?

 

LEK draws from six core case types, with a heavier emphasis on quantitative analysis and real-world data interpretation than most firms. LEK completes more than 2,000 cases annually for clients, per its 2026 figures, and interview cases mirror that client work.

 

• Market sizing: standalone estimation questions or estimates embedded in a larger case. Expect to build a top-down or bottom-up market sizing model with mental math

 

• Profitability: diagnosing why profits are declining or fluctuating. A profitability case requires breaking down revenue and cost drivers quantitatively

 

• Growth strategy: evaluating options for a company to grow, such as launching products, expanding capacity, or acquiring competitors

 

• Market entry: determining whether a company should enter a new market. A market entry case assesses attractiveness, competition, capabilities, and profitability

 

• Pricing: setting the price for a new product or service. LEK has published its own pricing example about a pill that cures baldness

 

• Commercial due diligence: LEK is one of the top firms for private equity work, so expect a commercial due diligence case that evaluates whether an acquisition target is attractive

 

LEK's client work skews toward life sciences, healthcare, MedTech, consumer products, and private equity. If your interview is with an office strong in one of these sectors, expect your case to borrow from that industry.

 

What makes LEK cases different from MBB cases?

 

Having coached candidates for LEK, McKinsey, BCG, and Bain, I can tell you that LEK cases stand out in three ways: heavier math, a fully candidate-led format, and the written case.

 

Dimension	LEK	McKinsey, BCG, and Bain
Case format	All candidate-led	McKinsey interviewer-led, BCG and Bain candidate-led
Quant intensity	More data tables, charts, and multi-step math	Moderate, more qualitative discussion
Written case	60-minute written case in the final round	Not standard (BCG and Bain use it only in select offices)
Case topics	Skewed to life sciences, healthcare, consumer, and private equity	Broad across all industries

 

The candidate-led format matters most for your prep. In candidate-led case interviews, silence from the interviewer does not mean you are wrong. It means they are waiting for you to propose the next step.

 

What Are Some LEK Case Interview Examples?

 

The seven case examples below come from LEK's own published materials, so they give you the most accurate sense of what to expect. Work through case interview examples out loud, not just in your head, since the candidate-led format rewards spoken practice.

 

Example 1: Brewery profits. Two beer companies, Cheapo Beer and Bourgeois Beer, report similar revenues but very different profit trends: Cheapo's profits grow steadily while Bourgeois's fluctuate significantly. What is causing this difference, and how would you minimize the fluctuations?

 

Example 2: Large pharma company. A pharmaceutical company has developed a pill that cures baldness within three months, but the pill must be taken daily to maintain results. How would you estimate the market size and price this product?

 

Example 3: Theater chain. A large theater chain has hired you to help with its revenue growth strategy. While you will examine the entire chain, the case focuses on one particular location.

 

Example 4: Soybean processing. You own a large soybean farm in Argentina and demand for soybeans is growing rapidly in Asia. Should you process soybeans in South America and ship them, or ship raw soybeans to Asia and process them there?

 

Example 5: Hotel investment. A major hotel company has the opportunity to build a 500-room hotel on a military base, offered by the U.S. government. Should they build the hotel or not?

 

Example 6: Juice company. A food and beverage company's juice division has $500 million in annual sales, where juice boxes and frozen concentrate are profitable but chilled juices barely break even. Should the director sell the chilled juices business?

 

Example 7: Specialty chemical manufacturer. A specialty chemical manufacturer has a plant in Philadelphia losing $25 million per year. Determine whether the plant can be turned around and how to do it.

 

Once you have exhausted the official examples, MBA consulting casebooks contain 700+ additional practice cases across every case type LEK uses.

 

What Are the Best LEK Case Interview Tips?

 

These seven tips combine LEK's own published interview advice with what I have seen work from coaching candidates who received LEK offers.

 

Tip #1: Listen carefully and verify the facts

 

When the interviewer gives you the case background, take detailed notes and then paraphrase the objective back to confirm your understanding. In my experience, solving the wrong problem is one of the most common ways strong candidates fail cases they should have passed.

 

Tip #2: Take your time before speaking

 

LEK interviewers expect you to pause and think. Rushing into an unstructured answer is worse than asking for 30 seconds of silence to organize your thoughts. Write down your approach before you start talking.

 

Tip #3: Build a tailored framework every time

 

LEK interviewers are trained to spot generic, memorized frameworks. Ask yourself: what three or four things must be true for me to confidently recommend this? Those become your framework buckets.

 

Tip #4: Lead with data, not opinions

 

This is LEK's cultural DNA. Base every conclusion on the data provided, and when you make assumptions, state them explicitly and explain your reasoning. Evidence over opinion is how LEK evaluates you, not just how it describes itself.

 

Tip #5: Drive the case proactively

 

Always tell the interviewer which area of your framework you want to explore next and why. Candidates who wait to be guided score poorly in a candidate-led format, even when their analysis is correct.

 

Tip #6: Connect every answer to the case objective

 

After each calculation or analysis, explain what it means for the overall recommendation. LEK calls this the "so what." Candidates who do math without tying it back to the objective will not advance.

 

Tip #7: Commit to a clear recommendation

 

State your answer firmly at the end of the case, supported by two or three data-backed reasons. If the interviewer introduces new data that changes things, show flexibility, but never flip-flop without reason.

 

How Do You Ace the LEK Written Case Interview?

 

You ace the LEK written case by spending your 60 minutes selectively: skim everything, analyze only the slides that answer the key questions, and write headlines that carry your entire argument. The written case appears in the final round and is a separate skill from oral cases.

 

What is the LEK written case format?

 

You are taken to a meeting room and given a packet of roughly 30 to 45 slides containing data, charts, and text about a client's business problem. The packet includes a prompt with about 6 key questions. In your 60 minutes, you must:

 

• Read and analyze the materials

 

• Select 7 to 10 slides that are most relevant to your recommendation

 

• Write a headline for each selected slide that summarizes its key insight

 

• Create an optional executive summary slide

 

After the 60 minutes, you present your slides to the interviewer for about 20 minutes, followed by 10 minutes of Q&A.

 

How should you approach the written case?

 

Follow these seven steps and budget your time against them strictly.

 

1. Understand the business problem (2 to 3 minutes): read the prompt and key questions first. Identify the core decision the client needs to make
   
   
2. Skim the materials (5 to 7 minutes): flip through all slides to map what data exists. Do not read anything in detail yet
   
   
3. Build a quick structure (3 to 5 minutes): use the key questions to create a rough structure for your analysis. This tells you which slides to focus on and which to skip
   
   
4. Analyze the key slides (25 to 30 minutes): do the math and write a one-sentence takeaway for each slide that answers a key question. Skip slides that do not contribute to your recommendation
   
   
5. Form your recommendation (5 minutes): there is no single right answer. As long as your recommendation is supported by data from the slides, you are in good shape
   
   
6. Write your headlines (10 to 15 minutes): lead with the conclusion, not the data. If someone read only your headlines, they should understand your entire argument
   
   
7. Prepare for Q&A (remaining time): anticipate challenges to your recommendation. Know your assumptions and what data would strengthen your case

 

The most common mistake I see is over-reading. With 30 to 45 slides and 60 minutes, you cannot read everything, and you are not supposed to. Roughly 20% of the slides drive 80% of the answer, so the real skill is finding those slides fast.

 

What Are the Most Common LEK Behavioral Interview Questions?

 

The LEK behavioral interview takes 5 to 10 minutes of each session, and ten questions come up most often. These questions are brief but they matter, because a weak fit answer sets a negative tone before your case even begins.

 

1. Why LEK?

 

Have at least three specific reasons. Mention the people you have met, LEK's strength in private equity and commercial due diligence, its 27 offices across 16 countries, or its evidence-driven culture. Avoid generic answers that could apply to any firm.

 

2. Why consulting?

 

Explain why consulting specifically appeals to you. Strong answers mention the variety of industries and problems, the steep learning curve, or the impact of advising companies on their biggest decisions.

 

3. Walk me through your resume

 

Give a concise 2-minute summary starting with your most recent experience. Highlight accomplishments that demonstrate analytical skill and leadership, then connect your background to why LEK is the next logical step.

 

4. What accomplishment are you most proud of?

 

Choose something specific and impressive, and structure it with the STAR method: Situation, Task, Action, Result. Quantify the impact, then explain why it matters to you personally.

 

5. Tell me about something not on your resume

 

This is your chance to show personality. Pick a unique hobby, volunteer project, or side accomplishment and make it memorable. LEK interviewers meet dozens of candidates and remember the interesting ones.

 

6. Tell me about a time you led a team

 

Choose an example where you directly managed or coordinated others. Focus on the actions you took as a leader and the measurable results the team achieved, ideally in a situation with conflict or ambiguity.

 

7. Describe a time you faced conflict or disagreement

 

Focus on the resolution, not the drama. Explain how you listened, understood the other perspective, and found a constructive solution. LEK wants to see that you handle interpersonal challenges maturely.

 

8. Give an example of a time you persuaded someone

 

Pick a situation where someone initially disagreed with you and you changed their mind through logic and evidence, not authority. This connects directly to LEK's evidence-driven values.

 

9. Tell me about a time you failed

 

Choose a real but not devastating failure. Spend 20% of your answer on what went wrong and 80% on what you learned and how you applied that lesson afterward.

 

10. Do you have any questions for me?

 

Always say yes. Ask the interviewer about their favorite project or what surprised them most about LEK's culture. The more genuine your curiosity, the better the impression you leave.

 

If you want to master 98% of fit interview questions in a few hours, my fit interview course covers every question above with example answers.

 

How Should You Prepare for LEK Interviews?

 

Most candidates need four to six weeks of focused preparation for LEK interviews. Having coached hundreds of candidates, here is the week-by-week plan I recommend.

 

1. Week 1, learn the fundamentals: study how case interviews work, how to build custom frameworks, and how to deliver a recommendation. Read or watch two to three full case examples to understand the flow
   
   
2. Week 2, practice solo cases: work through three to five cases on your own, focusing on structure and mental math. At this stage, prioritize getting the structure right over speed
   
   
3. Weeks 3 and 4, practice with a partner: do five to ten cases with a case partner and spend at least 15 minutes on feedback after each one. Since LEK cases are candidate-led, you must practice driving the conversation
   
   
4. Week 5, prepare the written case: the written case interview is a separate skill that needs dedicated time. Give yourself exactly 60 minutes to analyze a slide deck, write headlines, and present
   
   
5. Week 6, sharpen with mocks: do two to three mock cases with someone who has consulting experience, and prepare your behavioral answers. In the final days, limit yourself to one or two cases to stay sharp without burning out

 

If you want expert feedback on exactly where you stand, my interview coaching gives you 1-on-1 mock cases with detailed scoring.

 

The LEK case interview rewards candidates who drive the conversation, lead with data, and treat the written case as its own skill. Start your preparation four to six weeks out, and make practicing candidate-led cases out loud your single highest priority.

 

Frequently Asked Questions

 

What does LEK look for in case interview candidates?

 

LEK evaluates four things: analytical ability, structured thinking, communication, and business judgment. The firm describes its analytical rigor as grounded in evidence, not opinion, so every recommendation you make should be backed by data. Interviewers also want to see that you are coachable and easy to work with.

 

Is the LEK case interview harder than MBB?

 

LEK cases are not necessarily harder than McKinsey, BCG, or Bain cases, but they are more quantitative and data-heavy. LEK also includes a 60-minute written case that MBB firms do not use. Candidates on Glassdoor rate LEK interview difficulty at 3.31 out of 5 as of 2026, which is in line with other top strategy firms.

 

How many cases should you practice for LEK interviews?

 

Most successful candidates practice 15 to 25 cases before their LEK interviews. At least three to five should be done solo and five to ten with a partner who can push back on your reasoning. You should also run the written case format at least two to three times under a strict 60-minute limit.

 

Does LEK have a digital assessment?

 

Some LEK offices include a digital assessment in the application process. It is a short, game-based test of roughly 10 minutes that measures mental math, pattern recognition, and logical reasoning. Not every office uses it, but you should be ready for it when you apply.

 

How long does it take to hear back after a LEK interview?

 

Based on 2026 Glassdoor data from 551 reported interviews, the LEK hiring process averages 19 days from first interview to decision. LEK usually notifies candidates within one to two weeks after the final round. The full journey from application to offer typically takes two to three months.

 

What is LEK Consulting known for?

 

LEK Consulting is a global strategy firm founded in London in 1983 and known for private equity work, commercial due diligence, and sector strategy in areas like life sciences, healthcare, and consumer products. As of 2026, LEK has more than 2,300 employees and over 200 partners across 27 offices in 16 countries.

 

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