Demand Planner interview questions and practice.
Forecasts customer demand and plans inventory and supply to balance service levels against working capital.
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Last reviewed
This page is still being written: no authored question bank for this competency family. The role is fully supported in the interview itself; only the published question bank is outstanding.
What interviewers for Demand Planner actually ask
The question bank for this role is still being written. These are the first three competencies in the model the interview is scored against.
Produces forecasts the business can plan on: statistical baselines, market and sales intelligence, promotion and seasonality effects, forecast accuracy measurement and bias correction.
Balances availability against working capital: safety stock and reorder policies, MRP or replenishment parameters, supplier lead times, slow-moving and obsolete stock, and service level targets.
Runs or contributes to sales and operations planning: aligns demand, supply, capacity and finance in a monthly cycle, surfaces gaps and gets decisions made by the right people.
What they are really assessing
Interviewers rarely score whether you seemed nice. They score against a model like this one, usually without telling you it exists. Each competency has a weak, adequate and strong shape, and the difference is almost always the level of specific detail you volunteer without being asked.
Demand planning & forecasting
Produces forecasts the business can plan on: statistical baselines, market and sales intelligence, promotion and seasonality effects, forecast accuracy measurement and bias correction.
- Weak
- Forecasting described as taking last year's numbers; cannot quote forecast accuracy or explain how sales input was handled.
- Adequate
- Describes a forecasting process with a statistical baseline and sales input, quotes forecast accuracy and one example of correcting bias.
- Strong
- Quotes forecast accuracy and bias trends, describes a specific improvement (segmentation, promotion modelling, consensus process) with results, and how a forecast miss was diagnosed and fixed.
Inventory & supply planning
Balances availability against working capital: safety stock and reorder policies, MRP or replenishment parameters, supplier lead times, slow-moving and obsolete stock, and service level targets.
- Weak
- Cannot quote stock levels, days of cover or service levels; stock-outs and excess are blamed on suppliers or sales.
- Adequate
- Quotes inventory metrics and service levels, describes safety stock logic and a specific stock-out or excess situation resolved.
- Strong
- Quotes inventory reduction or service improvement with figures, the policy or parameter changes behind it, a trade-off negotiated with finance or sales, and how obsolete stock was reduced.
S&OP & cross-functional alignment
Runs or contributes to sales and operations planning: aligns demand, supply, capacity and finance in a monthly cycle, surfaces gaps and gets decisions made by the right people.
- Weak
- Describes S&OP as a meeting; cannot describe the cycle, a gap surfaced or a decision it produced.
- Adequate
- Describes the S&OP cycle steps and one example of a supply-demand gap surfaced and resolved.
- Strong
- Describes an S&OP process they built or improved, a specific gap with the options and the executive decision taken, and how the process changed forecast accuracy, service or stock.
Supplier & logistics coordination
Manages inbound and outbound flow: supplier schedules and performance, imports and Incoterms, freight and customs, transport planning and expediting when things go wrong.
- Weak
- Cannot explain Incoterms used, lead times or how a supplier delay was handled beyond phoning them.
- Adequate
- Describes supplier scheduling, Incoterms and customs basics, and one example of expediting a critical shipment.
- Strong
- Describes a supply disruption (port delay, supplier failure, customs hold) handled with alternatives and cost trade-offs, supplier performance metrics they managed, and a lead time or landed cost improvement achieved.
Supply chain data & systems
Uses ERP and planning systems (SAP, Oracle, Sage, planning tools) and Excel or SQL to maintain master data, analyse performance and build reports that drive decisions.
- Weak
- Uses the system to look up stock; cannot describe master data maintained, a report built or a data problem found.
- Adequate
- Describes maintaining planning parameters and building reports, with an example of a data error found and fixed.
- Strong
- Describes an analysis or tool they built that changed a decision (ABC segmentation, lead time analysis, exception reporting), the data quality issues resolved, and the business result.
Supply risk & continuity management
Identifies and mitigates supply risks: single sourcing, geopolitical and currency exposure, port and transport disruption, supplier financial health, with contingency plans and buffers sized to risk.
- Weak
- Risk management is reactive; cannot name a risk identified in advance or a contingency in place.
- Adequate
- Describes a risk register or review, one mitigation put in place (dual source, buffer) and a disruption handled.
- Strong
- Describes a risk they identified before it hit, the mitigation and its cost, what happened when the risk materialised, and how the approach changed the organisation's resilience.
Cost-to-serve & trade-off decisions
Understands total supply chain cost (inventory, freight, warehousing, obsolescence, expediting) and makes explicit trade-offs between cost, service and working capital, communicated to commercial and finance teams.
- Weak
- Optimises one metric (stock or cost) without recognising the trade-off; cannot describe a decision explained to sales or finance.
- Adequate
- Describes the main cost components and one trade-off decision made with commercial or finance involvement.
- Strong
- Describes a cost-to-serve analysis, a specific trade-off decision with figures (e.g. air freight vs stock-out cost), how it was agreed with stakeholders, and the outcome.
Reading the questions is the easy half. Try answering three of them out loud, to someone who follows up.
Try 5 minutes freeWhat your 30 minutes covers
The same shape as a real first-round interview, pitched at mid-level Demand Planner and scored throughout.
Warm-up, then Motivation & fit
Build rapport, settle nerves, and get a short walk-through of your background. Why this role, why this employer, and what you are actually looking for.
Your experience
Two or three real situations from your CV in depth: context, what you did, what happened, what you would change.
Pitched at mid-level scope: demand or supply planner owning a category: forecast accuracy, service and inventory targets, S&OP inputs and supplier performance.
Role-specific questions
The core competencies and domain knowledge for the role, with follow-ups on anything vague.
Drawn from this role's domain: statistical forecasting, consensus forecasting and measuring accuracy and bias, safety stock, reorder points and service level targets and mRP and replenishment parameters in the ERP, and the rest of the competency model.
Your questions, then Wrap-up
Your questions for the interviewer, and yes, they are assessed. Next steps and a clean finish.
What changes with seniority
The questions barely change between levels. What changes is the answer they will accept.
| Junior | Mid | Senior | |
|---|---|---|---|
| Scope of ownership | Planner or analyst for a product range or supplier group: maintains parameters, raises orders, expedites and reports service and stock. | Demand or supply planner owning a category: forecast accuracy, service and inventory targets, S&OP inputs and supplier performance. | Senior planner or planning manager: owns the S&OP process or a planning team, network inventory policy and major supplier relationships. |
| Tolerance for ambiguity | Handles routine exceptions; escalates supply gaps and parameter changes with a recommendation. | Makes calls on parameters and orders under uncertain demand; challenges sales forecasts with data. | Sets planning policy and trade-offs across categories; leads through disruptions and demand shocks. |
| People leadership | No direct reports. | May supervise a junior planner or coordinate a category team. | Leads planners; builds capability and planning discipline. |
| Who they deal with | Suppliers, warehouse, sales for demand input, buyers. | Sales and marketing, finance, procurement, logistics providers. | Commercial and finance leadership, operations, key suppliers and logistics partners. |
What your report would say
Every competency above scored from your own answers, the sentence that cost you quoted back, and your weakest answers rewritten the way a strong Demand Planner would have said them.
- Describes an S&OP process they built or improved, a specific gap with the options and the executive decision taken, and how the process changed forecast accuracy, service or stock.
The format, not a result. Scores on your report come from what you actually said.
Is the AI interviewer realistic? See a full sample report