Senior Demand Planner & Buyer — Ecommerce Apparel

Thrivin; Bath; On-site; GBP 55,000 - 75,000; Full time

Job summary

Thrivin seeks an experienced Demand Planner & Buyer to own planning, buying and inventory across the business in a fast-paced ecommerce environment. You will forecast, manage open-to-buy and drive PO creation, replenishment and inventory optimisation to support growth.

You will work with product, operations and commercial teams, delivering insights to guide trading decisions and ensure right product at the right time with strong stock health. Strong Excel and data-analysis skills are essential.

Qualifications

• Experience personally owning planning and buying decisions in apparel.
• Hands-on with open-to-buy, forecasts and purchase orders.
• Strong ability to analyse demand, stock and commercial targets.
• Proven supplier-facing experience and ability to chase MOQs and lead times.

Responsibilities

• Own the open-to-buy by category, including forecasts and plan vs. actuals.
• Run the bi-weekly replenishment cycle end-to-end and submit POs.
• Determine newness buy quantities by style, colour and size with launches.
• Own full PO lifecycle: creation, amendments, invoicing and ETA tracking.
• Maintain healthy stock levels, size availability and in-stock rates.
• Identify stock risks and act to optimise sell-through.
• Lead markdowns and overstock actions to protect inventory health.
• Analyze weeks of cover, sell-through, margins and discount rates.
• Present planning readouts in weekly/monthly trade reviews.
• Collaborate with suppliers on proforma invoices, MOQs and timelines.

Skills

Demand planning

Buying

Open-to-buy (OTB)

PO management

Excel

Data analysis

Supplier management

Proforma invoices

MOQs

Lead times

Tools

Excel

Claude Code

Claude Cowork

Job description

Thrivin seeks an experienced Demand Planner & Buyer to own planning, buying and inventory across the business in a fast-paced ecommerce environment. You will forecast, manage open-to-buy and drive PO creation, replenishment and inventory optimisation to support growth.

You will work with product, operations and commercial teams, delivering insights to guide trading decisions and ensure right product at the right time with strong stock health. Strong Excel and data-analysis skills are essential.