Senior Demand Planner & Buyer – Inventory & Sourcing Lead

Thrivin; Norwich; On-site; GBP 50,000 - 70,000; Full time

Job summary

Thrivin, a fast-growing global activewear brand, seeks an experienced Demand Planner & Buyer to take ownership of planning, purchasing and inventory management across the business. You will forecast demand, manage open-to-buy and drive replenishment and stock health in a high-volume ecommerce environment.

You will work with product, operations and commercial teams, providing clear recommendations to support trading decisions and growth.

Qualifications

• 5+ years' experience in apparel planning, merchandising, buying or a closely related field.
• Experience owning an open-to-buy and making commercial buying decisions.
• Hands-on experience creating and placing purchase orders.
• Strong Excel and data analytics skills.
• Experience with supplier management and MOQs / lead times is beneficial.

Responsibilities

• Own open-to-buy by category, including sales forecasts, receipt plans and plan vs actual performance.
• Run the bi-weekly replenishment cycle end-to-end from demand to PO submission.
• Determine newness buy quantities at style, colour, and size level to align with launch dates and targets.
• Own the full purchase order lifecycle from creation to tracking and follow-ups.
• Own inventory management across categories, maintaining stock health and in-stock rates.
• Monitor inventory performance and identify stock risks, shortages and excess inventory.
• Lead markdown and overstock actions to optimise sell-through and health.
• Analyse planning metrics: weeks of cover, sell-through, size curves, margin and discount rate.
• Deliver planning readouts during weekly and monthly trade reviews.

Skills

Open-to-buy

Forecasting

Inventory management

PO management

Excel

Data analysis

Vendor management

Team leadership

Tools

Claude Code

Claude Cowork

Job description

Thrivin, a fast-growing global activewear brand, seeks an experienced Demand Planner & Buyer to take ownership of planning, purchasing and inventory management across the business. You will forecast demand, manage open-to-buy and drive replenishment and stock health in a high-volume ecommerce environment.

You will work with product, operations and commercial teams, providing clear recommendations to support trading decisions and growth.