Fictional practice, not an employer interview question.
Original exercise, not a reported employer interview question. A subscription business has rising revenue but declining contribution margin. Diagnose two plausible causes and propose a focused test.
See a worked response
A defensible response
Define the margin calculation and compare cohorts, price changes, retention, and service cost on a consistent basis. Distinguish customer growth from changes in customer mix. Identify the largest plausible driver before adding more analysis. Propose a bounded retention, pricing, or operating test with customer and cost safeguards. State the implementation owner and the evidence needed to expand it. Do not present a favorable modeled margin as a delivered outcome; explain what the pilot can and cannot establish.
Check your answer
Is the margin change driven by mix or within-cohort behavior? What would convince you the proposed action harms long-term customer value?
Prepare your application
Rising revenue does not explain falling contribution margin. A Bain preparation case should separate the possible causes, size the decision and identify the next test. Make the recommendation easy to challenge. Your evidence should show how analysis changes a client's choice, not just that you can produce a well-organized slide deck.
Choose your application route
Work to compare: Client-facing consulting or advisory; Data, digital, or technology delivery; Deals, audit, tax, risk, or specialist work; Project and program leadership; Research, knowledge, and internal functions.
Prepare one example: A results portfolio combining case practice, quantified leadership stories, team examples, and a role-specific reason for Bain and the target office.
Ask the team: Which tradeoff involving strategy, performance improvement, or private equity appears most often on the team?
Employer resource: Bain & Company careers
Before applying: Check the vacancy’s degree or experience gate, term, worksite, pay basis and deadline. This is preparation guidance, not a verified 2027 internship list. A suggested work sample is not an application requirement.
Choose the work, then the evidence
Bain & Company is a global management consulting firm known for results-oriented strategy and private-equity work. That broad description hides very different teams and evidence standards. Start by identifying the role family, level, geography, work model, product or business area, and the operating problem behind the opening.
Read the job description twice. On the first pass, mark non-negotiable qualifications. On the second, underline repeated problem language such as strategy, performance improvement, private equity, customer strategy, digital, organization. Repeated language can suggest priorities, but it does not prove the team's internal problem. Treat that interpretation as a hypothesis.
| Role family | High-signal proof |
|---|---|
| Client-facing consulting or advisory | Structured problem solving, hypothesis-driven analysis, executive communication, team contribution, and client implementation impact. |
| Data, digital, or technology delivery | Architecture or analytics depth plus the ability to turn technology into measurable client results within client problems where practical results, entrepreneurial energy, team support, and persuasive analysis matter. |
| Deals, audit, tax, risk, or specialist work | Relevant technical standards, professional judgment, evidence quality, controls, and the ability to explain implications to non-specialists. |
| Project and program leadership | Workplan design, stakeholder alignment, issue escalation, team development, quality control, and quantified delivery outcomes. |
| Research, knowledge, and internal functions | Domain expertise, reusable intellectual capital, service mindset, and evidence that your work improved client or firm decisions. |
The table describes preparation choices, not six confirmed open job families.
Make one result inspectable
For the work described here, useful priorities are curious problem solving, results orientation, entrepreneurial initiative, collaborative team behavior, clear persuasion. Treat these as editorial preparation criteria, not an employer scoring system.
Weak: Helped evaluate a market opportunity for a client.
Illustrative rewrite, not a real candidate result: Built a customer-cohort and capacity model for a subscription business, identified two profit leaks, and helped pilot retention and pricing changes that improved contribution margin 6 points.
Interview preparation and permitted tools
Follow the written invitation for the role, country and stage. Confirm the assessment format, permitted tools and any rules on AI assistance; keep restricted tasks independent. Use only public or authorized material in a work sample. Be ready to explain the method, a failed assumption and your own contribution.
- Bain & Company careers
- Current job description for the exact role, location, and level
- Written recruiter instructions for assessments, interviews, tools, logistics, and eligibility
Related career guides
McKinsey & Company job guide | Boston Consulting Group (BCG) job guide | Accenture job guide
Sources and related guides
Official sources
Official sources and current instructions
The source collection was revised September 5, 2026. These links help you find the employer’s current guidance. This guide does not establish a current opening, eligibility, deadline, or interview process.
About this guide
By InternshipDeadlines · AI-assisted editorial adaptation · Updated September 6, 2026
Original practice material, not a reported employer interview question. Scenarios are hypothetical. Application preparation with labeled fictional practice. Original employer research dates retained; no current vacancy or employer assessment claim.
Published by InternshipDeadlines. Guide updated . How we use sources.
Cite this guide
InternshipDeadlines. Bain & Company application practice. Updated . https://internshipdeadlines.com/career-guides/bain-and-company/
Use the dates attached to the sources behind your claim. An editorial update does not reverify every source or confirm that an internship is open.