Author: Taylor Warfield, Former Bain Manager and interviewer

Last Updated: June 22, 2026

 

The Efficio case interview is a 20-minute, data-driven case study where you analyze a client's spend in one category and present specific, quantified ways to cut cost. This guide breaks down all four interview stages, shows you exactly how the case study is scored, and walks through a full worked example so you know what to deliver.

 

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Key Takeaways

 

To pass the Efficio case interview, identify the biggest cost-saving opportunities in the category you are given, support each one with a calculated savings figure, and present your recommendations clearly to interviewers who stay in character as the client.

 

• Efficio runs a four-stage process: a competency interview, an online data assessment, a case study, and a final interview

 

• The case study gives you about 20 minutes to review client data and find cost savings in one procurement category

 

• Every recommendation must be backed by a savings number, with your assumptions stated out loud

 

• The 37-minute online assessment tests problem solving, numerical reasoning, and data literacy

 

• Interviewers play the Head of Procurement and Operations Manager, so stakeholder skills are tested directly

 

• Knowing core procurement cost levers is what separates strong candidates from average ones

 

What Is the Efficio Case Interview?

 

The Efficio case interview is a procurement-focused case study that tests how you analyze cost data and recommend savings under time pressure. You get a client brief and operational data, then have about 20 minutes to prepare a short presentation that identifies cost-reduction opportunities, explains your reasoning, and quantifies the savings.

 

What makes it different from a standard interview is the realism. Efficio designs its assessments to mimic the actual problems its consultants solve for clients, so the case study feels like a real project task rather than an abstract puzzle.

 

If you have never sat a case interview before, the format will feel different from a normal behavioral conversation. You are expected to do real analysis, reach a defensible answer, and defend it to people acting as your client.

 

What Does Efficio Do, and Why Does It Matter for Your Case?

 

Efficio is a specialist procurement and supply chain consultancy, founded in 2000 and headquartered in London. It describes itself as the world's largest independent procurement and supply chain consultancy, with over 1,200 people representing more than 50 nationalities across offices in Europe, North America, and the Middle East.

 

This focus shapes everything about the interview. Because the firm lives and breathes cost reduction, your case will look far more like a procurement case interview than a classic profitability or market entry case.

 

Most of the firm's work sits in strategic sourcing, supplier management, and cost optimization, which is the heart of supply chain consulting. Knowing how procurement teams actually save money gives you a real edge in the case study.

 

Compensation reflects the specialist nature of the work. Based on Glassdoor estimates from 2026, management consultant roles in New York post pay ranges of roughly $81,000 to $137,000, while business analysts in London average around £44,000 in base salary.

 

What Are the Stages of the Efficio Interview Process?

 

The Efficio interview process has four main stages: a competency-based interview, an online numerical and data literacy assessment, a case study interview, and a final interview. Each stage is designed to test a different core skill, and you generally need to clear one before moving to the next.

 

Stage	What it tests	Key detail
Competency interview	Behavioral strengths, motivation, and fit	Structured with the STAR method
Data assessment	Problem solving, numerical reasoning, data literacy	37-minute online test, three parts
Case study	Analysis, structuring, stakeholder management, communication	~20 minutes prep, then a presentation
Final interview	Experience, motivation, team fit	Similar format to the competency round

 

Stage 1: The competency-based interview

 

The competency interview assesses your strengths against the core skills the role requires. Expect behavioral questions about times you solved problems, worked in a team, or handled a setback.

 

Efficio explicitly recommends the STAR method, so frame each answer around the situation, task, action, and result. Come ready with a few transferable examples and a clear, specific reason for wanting to join the firm.

 

Stage 2: The numerical and data literacy assessment

 

This is a 37-minute online assessment made up of three short tests, each lasting roughly 10 to 15 minutes. The problem solving test uses logical reasoning over tables and text, the numerical test checks fast mental computation and number sequences, and the data literacy test pulls questions from real Efficio projects.

 

Have a calculator, pen, and paper ready, and make sure your internet connection is stable before you start. Sharp case interview math is the single best thing you can train here, since speed and accuracy under a timer are exactly what the test rewards.

 

Stage 3: The case study interview

 

The case study is the centerpiece of the Efficio process and the stage most candidates worry about. You analyze a client's cost data in one category, then present specific savings opportunities to interviewers playing client roles.

 

It rewards candidates who can identify opportunities, problem solve, and present a clear idea, all under time pressure. The next two sections break down exactly how it works and how to solve it.

 

Stage 4: The final interview

 

The final round usually mirrors the competency interview, with a heavier focus on your prior experience and your motivation to join Efficio. It is also where the firm digs into team fit and gives you space to ask questions.

 

Treat this round as a two-way conversation. Strong, specific questions about the work and the firm signal genuine interest and maturity, both of which Efficio looks for.

 

How Does the Efficio Case Study Work?

 

In the Efficio case study, the Head of Procurement asks to meet you in 20 minutes to discuss how to reduce cost within a specific category. You receive introductory information on the client plus detailed operational data, and you use the prep time to build a short presentation.

 

Your presentation must meet three objectives set by the chief procurement officer. These are the exact goals Efficio publishes in its candidate brief.

 

1. Suggest opportunities: recommend procurement opportunities to reduce cost in the category
   
   
2. Explain your choices: justify why you selected those specific opportunities
   
   
3. Quantify the savings: show how much Efficio could save the client, with the math behind it

 

Every proposal needs a savings figure calculated from the data, along with any assumptions you made. The Operations Manager and Head of Procurement both sit in the room and stay in character, so you are presenting to a client, not lecturing an interviewer.

 

Efficio is clear that the case is not a trap. It publishes a sample case study and guidance notes, and the firm states plainly that the process of how you reach the answer matters more than the answer itself.

 

How Do You Solve the Efficio Case Study?

 

Solve the Efficio case study by working through the data in a clear sequence: understand the objective, structure the spend, find the cost drivers, build savings levers, quantify each one, and prioritize before you present. Following a repeatable process is what stops you from jumping to conclusions, which is the mistake the firm warns against most.

 

1. Pin down the objective: read the brief fast and confirm which category you are cutting cost in and by roughly how much
   
   
2. Structure the spend: break the category into clean, non-overlapping buckets so you know where the money goes, the same logic you would use with any case interview framework
   
   
3. Find the cost drivers: look for the few line items, suppliers, or activities that drive most of the spend
   
   
4. Build savings levers: apply procurement levers such as supplier consolidation, renegotiation, demand reduction, specification change, and insourcing versus outsourcing
   
   
5. Quantify each opportunity: calculate the savings, state every assumption, and keep the math clean enough to defend out loud
   
   
6. Prioritize by impact and feasibility: focus on the ideas with the biggest, most realistic savings rather than listing everything
   
   
7. Present answer first: lead with your recommendation and the number, then explain the why and the how

 

Notice that the quantification step is non-negotiable. A smart idea with no savings number behind it will not score, because the chief procurement officer asked specifically how much Efficio could save.

 

Case interviews are tough, and the only reliable way to get fast at this sequence is reps. If you want to learn case interviews quickly, my case interview course walks you through proven structuring and math strategies in as little as 7 days.

 

Worked Example: A Subcontractor Cost-Reduction Case

 

Here's an example built on the kind of construction procurement case Efficio uses in practice. The numbers below come from a published Efficio case, and the savings calculation is illustrative to show the method.

 

Let's say a construction client spends £24 million a year on subcontractors. It also spends £79.8 million a year on its own 1,000 directly employed operatives, and the average subcontractor costs £400 per day.

 

Start by comparing the true cost of each route. In-house operatives cost £79.8 million divided by 1,000 people, or £79,800 each per year.

 

Assume an operative works about 220 days a year, an illustrative figure you would state out loud. That puts the in-house day rate near £363, roughly 9 percent cheaper than the £400 subcontractor day rate.

 

Now size the opportunity. If the client could insource 20 percent of its £24 million subcontractor spend, that is £4.8 million shifting to a route that runs about 9 percent cheaper, for illustrative savings near £430,000 a year.

 

The point is not the exact number. It is that you turned raw data into one prioritized, quantified recommendation, named your assumptions, and gave the client a figure they can act on.

 

You would round out the answer with one or two more levers, such as renegotiating subcontractor day rates or consolidating the subcontractor base. Each one gets its own savings estimate so the total is clear.

 

What Skills Does the Efficio Case Interview Test?

 

The Efficio case study tests six skills at once, and the firm is open about what they are. Knowing them lets you self-score your practice and fix weak spots before the real thing.

 

• Structured problem solving: breaking a messy category into logical buckets instead of guessing

 

• Quantitative analysis: reading data quickly and turning it into defensible savings numbers

 

• Commercial awareness: knowing which procurement levers actually move cost in the real world

 

• Stakeholder management: handling interviewers who stay in role, including one who may be short on time or blunt

 

• Concise communication: presenting conclusions clearly and leading with the answer

 

• Self-awareness and maturity: staying calm, listening actively, and showing genuine enthusiasm

 

These are the same muscles you build for an operations case interview, where data analysis and process thinking carry the day. If you have practiced those, much of the work transfers directly.

 

How Should You Prepare for the Efficio Case Interview?

 

Prepare for the Efficio case interview by drilling procurement cost levers, sharpening your data math, and rehearsing a clear presentation to someone playing the client. The tips below map directly to how the firm scores you.

 

Tip #1: Learn the core procurement cost levers cold

 

Know supplier consolidation, renegotiation, demand management, specification change, and make versus buy well enough to apply them instantly. These are the recommendations every Efficio case is fishing for, so they should be second nature.

 

Tip #2: Train fast, accurate data analysis

 

The case and the online assessment both reward speed with numbers. Practice computing percentages, unit costs, and run rates quickly, the same way you would prep for a pricing case interview.

 

Tip #3: Make quantifying savings a habit

 

Every time you generate an idea in practice, force yourself to attach a savings figure and state your assumptions. This single habit is what most candidates skip, and it is exactly what the chief procurement officer asks for.

 

Tip #4: Prepare STAR stories for the competency rounds

 

Build three to four strong stories using the STAR method that show problem solving, teamwork, and resilience. The same stories carry you through both the competency interview and the final round.

 

For the behavioral side, my fit interview course covers how to structure answers that land with interviewers in just a few hours.

 

Tip #5: Rehearse presenting to a real person

 

The case is a presentation, not a worksheet, so practice delivering out loud to someone who pushes back. Running a mock case interview with a partner builds the stakeholder skills the role demands.

 

If you want sharper feedback, my case interview coaching pairs you with former interviewers who can pressure-test your delivery.

 

Tip #6: Research Efficio and nail your motivation

 

Be ready to explain why procurement and why Efficio specifically, not just why consulting. A specific, well-researched answer in the fit interview is a strong signal of genuine interest.

 

Tip #7: Get your resume past the first screen

 

None of the prep matters if your application never advances. A tight, results-focused consulting resume that highlights analytical and commercial wins is what gets you to the first interview.

 

What Are the Most Common Mistakes in the Efficio Case Interview?

 

The most common mistakes are easy to avoid once you know them. Each one maps to a skill the interviewers are actively scoring.

 

• Jumping straight to recommendations without analyzing the data first

 

• Suggesting ideas with no savings number or no stated assumptions

 

• Ignoring the interviewers in the room instead of treating them as the client

 

• Listing ten weak ideas rather than prioritizing the two or three that matter

 

• Hiding your logic instead of walking through how you got to the answer

 

The Efficio case interview rewards candidates who turn raw cost data into a small number of clear, well-quantified savings ideas and present them with confidence. Master the procurement levers, drill your math until it is fast, and rehearse presenting to someone playing the client. Do that, and you will walk into the case study ready to deliver exactly what the interviewers want to see.

 

Frequently Asked Questions

 

How long is the Efficio case study?

 

The Efficio case study gives you roughly 20 minutes to review the client data before you present. The Head of Procurement meets you after that prep window for a short presentation, during which you walk through your cost-saving ideas and the savings you have calculated.

 

Is the Efficio case interview hard?

 

Efficio candidates on Glassdoor rate the interview difficulty at 3.18 out of 5 as of 2026, with about 68.7 percent describing their experience as positive. The case study is challenging mainly because of the time pressure and the need to quantify every recommendation, not because the math itself is advanced.

 

What is on the Efficio online assessment?

 

Efficio sends a 37-minute online assessment made up of three tests. They cover problem solving, numerical reasoning, and data literacy, with each part lasting roughly 10 to 15 minutes. The data literacy questions are drawn from real Efficio projects.

 

Does Efficio use Excel in the case interview?

 

Yes, the Efficio case study is data heavy and several candidates report an Excel-based data set to analyze for cost-saving opportunities. You should be comfortable sorting, filtering, and running quick calculations on spend data so you can support each recommendation with a number.

 

How long does Efficio's hiring process take?

 

The Efficio hiring process takes about 38 days on average according to Glassdoor data from 2026. Timelines vary by role and location, and the process typically moves through a competency interview, an online assessment, a case study, and a final interview.

 

Do I need a procurement background to pass the Efficio case interview?

 

No, you do not need prior procurement experience to get an offer at Efficio. You do need to understand basic procurement cost levers such as supplier consolidation, renegotiation, demand management, and specification change, since the case study is always about reducing cost in a category.

 

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