Merchandising Buying interview prep.

Behavioural questions to expect

1. Walk me through your CV.
2. Walk me through your most impressive category, private label launch, or vendor negotiation.
3. Tell me about a weakness, a failure, or feedback you've received and worked on.
4. Why merchandising / buying — and why mass retail specifically?
5. Why mass retail and not a specialty retailer, a department store, or a pure DTC brand?
6. Why the firm?
7. When a customer is choosing between the firm and a top competitor for the sector, what's the assortment-level reason she ends up at the firm?
8. Which categories at the firm look healthy right now, and where would you focus the next round of category investment?

Technical concepts to master

• Open-to-buy (OTB) — the buyer's working budget at mass-retail scale

  Open-to-buy (OTB) — the equation · MFP — Merchandise Financial Plan at scale · GMROI — Gross Margin Return on Inventory

• Category management framework — role-based assortment construction at scale

  Category roles · The 4-pillar mass-retail merchant lens · SKU rationalisation and assortment edit

• Vendor matrix and joint business planning (JBP) — the buyer-vendor operating system

  Vendor matrix construction · Joint Business Plan (JBP) · Vendor income and the gross margin bridge · Walking away from a top vendor

• Private label vs. national brand — the margin and trip-role trade-off

  Private label as a margin engine · Tiered private label architecture · The vendor relationship cost of private label · Sourcing and quality discipline

Practical drills

• A category has $1B in annual net sales. National brand SKUs (75% of sales) run at 32% IMU; private label SKUs (25% of sales) run at 45% IMU. Markdown rate on the blended category is 8% of receipts. Vendor income contributes 3 points of category gross margin. Compute the blended IMU, the net realised gross margin, and the gross margin dollars. Then: if you lift private label penetration from 25% to 30% (national brand share 70%), what's the gross margin dollar impact, all else equal?
• You are taking over the the sector category — $800M net sales, 30% IMU, 6% markdown rate, 26% net gross margin, 22% private label penetration, top-10 vendor concentration 65%. Annual category review is in 8 weeks. Walk me through how you'd prep and structure the review.
• You are preparing the annual Joint Business Plan negotiation with a top-10 vendor in the sector who contributes 8% of category sales. They are asking for a 4% unit cost lift driven by global commodity inflation. You need to defend the the firm's margin architecture, position for vendor income, and protect the supply commitment. 5 minutes prep, 5 minutes delivery.

Smart-question anchors

• Category investment priorities and OTB direction — which categories the senior merchant team is leaning into for the next 12-24 months and the gating economic signal
• Private label strategy and tier architecture — penetration target, tier roadmap (opening price / NBE / premium), and where private label competes vs. complements national brands
• Vendor matrix and joint business planning culture — top-vendor concentration risk, JBP cadence, and the {firm_name}'s posture on walking vendors who refuse cost concessions
• Buyer-planner-replenishment partnership — how OTB and demand forecasting work in practice across the buyer-planner-replenishment table and where the friction lives
• In-year reactivity and category-comp discipline — how the team's category-comp reviews are run, the trigger criteria for in-year pivots, and the cultural appetite for reactivity

Sourced from

National Retail Federation (NRF) — buyer and merchant career resources · RIS News and Retail Dive — mass-retail category and vendor coverage · McKinsey and Bain Retail Practice — assortment, pricing, and private label publications · Annual 10-K filings and investor day decks of major mass retailers · Wall Street Oasis, Glassdoor, and Reddit r/retail mass-retail buyer interview threads