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Overview
Supply chain interviews test whether you can hold service, cost and working capital in tension at the same time. The exercise stage is usually analytical — a demand and inventory dataset, a supplier scenario, or a network trade-off — followed by questions about a disruption you managed and a supplier relationship you repaired. Candidates who quote inventory theory without a working example of a stockout they prevented tend not to progress. This page covers the stages, the topics and the questions.
The hiring process, stage by stage
CV screen
Screened on the scope you have managed — categories, spend, supplier base, geography — and on the planning and ERP systems you have worked in.
How to prepare: State scope in concrete terms: what you bought or planned, from how many suppliers, across how many locations. Name the planning system, since employers filter on it.
Screening call
Covers your remit across planning, procurement and logistics, who you reported to, and the service and inventory measures you owned.
How to prepare: Be clear about which parts of the chain you owned, since the title covers very different jobs. Have your service level and inventory numbers ready with context.
Analytical or case exercise
A spreadsheet task or written case — forecast from a demand history, size a safety stock, evaluate two suppliers on landed cost and risk, or respond to a disrupted lead time.
How to prepare: Practise working from a messy demand history: clean the data, identify seasonality and outliers, then forecast. Rehearse a landed-cost comparison that includes freight, duty, payment terms and inventory holding, not just unit price.
Technical and stakeholder interview
With the supply chain lead plus commercial or operations. Covers a disruption you managed, a supplier negotiation, and how you handle a sales team asking for stock you do not have.
How to prepare: Prepare a disruption story with the trade-offs you made explicit, and a negotiation where you can describe your leverage and your walk-away position honestly.
Final interview
Usually with a director, focused on your view of their supply chain risks, working capital, and where you would look first.
How to prepare: Form a view from their public information about where their chain is likely exposed — single-source dependency, long lead times, seasonality — and frame it as a question rather than a diagnosis.
What to study
Demand planning and forecasting
Almost every downstream problem starts here, and the exercise stage frequently opens with a demand history that needs cleaning before it can be forecast.
Inventory and service trade-offs
The central tension of the role. Interviewers listen for whether you can state the trade-off in cash terms rather than treating stock as free insurance.
Supplier management and sourcing
Cost and risk both sit here, and employers want to know whether you manage suppliers actively or only place orders with them.
Logistics and lead time management
Lead time variability drives more inventory than lead time length, and few candidates make that distinction unprompted.
Risk and disruption response
Every candidate now has disruption experience, so the differentiator is the structure of the response and what changed permanently afterwards.
Cohesyve for candidates
Practise a Supply Chain Manager assessment before the real one
Run the same AI job simulations companies use to evaluate applicants. You get a scored report showing where you're strong and where you're not, plus what to work on.
Your preparation plan
Four weeks out
Rebuild the analytical foundations and study the employer.
- •Refresh safety stock and reorder logic until you can derive them rather than recall them
- •Work out what the employer sells, where it likely comes from and what their lead times imply
- •Reconstruct your own service, inventory and accuracy numbers with context
- •Read up on the planning system named in the advert if you have not used it
Two weeks out
Practise the analytical exercise on real-shaped data.
- •Take a messy demand history, clean it, forecast it and state your assumptions
- •Build a landed-cost comparison of two suppliers including terms and holding cost
- •Size a safety stock for two items with different variability and explain the difference
- •Write a one-page shortage recommendation with options and consequences
The final week
Prepare the narrative stages.
- •Rehearse a disruption story with the trade-offs and the permanent change stated
- •Prepare a negotiation example with your leverage and walk-away position
- •Draft six questions on their planning process, supplier base and inventory targets
- •Confirm whether the exercise is spreadsheet-based and which software will be available
The day before and the day of
Settle on structure rather than extra reading.
- •Reread the job advert and identify which part of the chain the role really owns
- •Review your own numbers once so you quote them accurately under pressure
- •Plan to state assumptions explicitly in the exercise rather than hiding them
- •Have a blank sheet ready for a quick calculation during the interview
Questions to expect
“How would you set safety stock for a fast-moving item with a long, variable lead time?”
What they're really asking: Do you understand the drivers, or have you only used whatever the system suggested?
How to answer: Name the drivers — demand variability, lead time variability, target service level — and say which dominates here, which is lead time variability. Then talk about reducing the variability at source before buying more buffer, and state the cash cost of the buffer you would hold.
“Sales is promising delivery dates you cannot meet. How do you handle it?”
What they're really asking: Do you manage the commercial relationship, or do you become the department that says no after the fact?
How to answer: Address the process rather than the incident: visibility of available-to-promise, an agreed rule for exceptions, and a regular planning conversation. Then describe how you handle the immediate case — options with dates and costs, not a refusal.
“Walk me through a disruption you managed.”
What they're really asking: Was your response structured, and did anything change permanently as a result?
How to answer: Assess exposure, agree allocation rules, secure alternatives with their cost, communicate options to commercial with dates. Finish with the structural change afterwards — a second source qualified, a dependency mapped, a buffer resized.
“Two suppliers quote different unit prices. How do you choose?”
What they're really asking: Do you buy on unit price, or do you understand total cost and risk?
How to answer: Build landed cost including freight, duty and payment terms, add the inventory cost implied by lead time and minimum order quantity, then weigh quality history, capacity and concentration risk. Say which factor would override a price advantage.
“Your forecast accuracy is poor. What do you do?”
What they're really asking: Will you blame sales, or diagnose the forecast properly?
How to answer: Separate bias from error, since bias is fixable and points to a process problem. Segment by product and channel to find where the error concentrates, then address that specific input rather than adjusting the whole model.
“How do you decide what to hold and what to make to order?”
What they're really asking: Can you segment a range, or do you apply one policy to everything?
How to answer: Segment by value, volume and volatility, then match a policy to each segment. Explain the customer lead time each segment can tolerate, and name what you would deliberately allow to have a longer lead time.
What to bring as evidence
Your service level, inventory value and forecast accuracy figures with the context behind them
A disruption you managed, including the permanent change that followed
A sourcing decision with a landed-cost comparison behind it
An inventory reduction or service improvement with the trade-off stated in cash
A supplier performance framework you introduced or ran
A description of the planning cycle you operated and who participated in it
Common mistakes
Quoting inventory theory without a worked example of applying it to a real range.
Comparing suppliers on unit price without freight, duty, terms and holding cost.
Treating a forecast accuracy problem as a sales behaviour problem without diagnosing bias.
Describing disruption management with no structural change afterwards.
Applying one inventory policy across an entire range rather than segmenting it.
Presenting inventory reduction as an unqualified win without stating the service risk taken on.
Questions to ask them
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How is the forecast produced, and who owns it when it is wrong?
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What are the current service and inventory targets, and are they in conflict?
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How concentrated is the supplier base, and where is the single-source exposure?
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Which planning system is in use, and how much planning happens outside it in spreadsheets?
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How does supply chain sit relative to commercial in the decision-making structure?
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What was the last significant disruption, and what changed because of it?
Frequently Asked Questions
How much of the exercise will be spreadsheet work?
Usually a substantial part — a demand history to forecast, or a cost comparison to build. It rarely requires advanced techniques, but it does require you to be quick and to state your assumptions where the data is ambiguous.
Do I need experience of their specific planning system?
It helps at the screening stage, but the underlying logic transfers. Be explicit about which systems you have used and how quickly you have picked up new ones, rather than implying familiarity you do not have.
Does sector experience matter?
It matters where the constraints are sector-specific — shelf life, regulated goods, extreme seasonality. Prepare a clear account of what those constraints would mean for planning in their business.
Should I quote my inventory and service numbers?
Yes, with context, since they are meaningless without the range and the service target. Never quote a number you cannot explain the derivation of, because the follow-up question is nearly always how it was calculated.
What is the best way to practise the analytical stage?
Work against a realistic dataset under time rather than reviewing formulas. Cohesyve can build a supply chain exercise from the job you are targeting — forecasting, inventory sizing and a sourcing trade-off — and return a scored report, with three assessments free.
Practice
What a Supply Chain Manager assessment tests, and how it's scored →
Career guide
What a Supply Chain Manager actually does, and where the path leads →
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Cohesyve · Practice for candidates
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3
free assessments
$0
no card required
Full
scored report every run
Every
question type included
3 free assessments · No card required · Pro from $16/mo
For hiring teams
Hiring for a Supply Chain Manager role? See how your applicants perform before you spend interview time.