Demand Planning & Supply Chain Manager

This role is responsible for building and maintaining demand forecasts and inventory plans across the Supplements business. You will translate commercial inputs into structured demand forecasts and turn those into clear, well-reasoned recommendations on what we should buy and when.

This is not a coordination role. The context matters. The Supplements business is moving from a primarily DTC model into omnichannel — adding wholesale, retail, and marketplace channels on top of a subscription base that already works. That transition is the opportunity: demand becomes less predictable, inventory sits in more places, and cash gets committed earlier. This role is being created specifically to own that complexity. There is no model to inherit, no process to maintain — you are building the planning infrastructure from the ground up, at the moment it becomes business-critical.

1. Demand Planning

Build and maintain SKU-level demand forecasts across all channels — DTC, wholesale, Amazon, and international.

• Maintain and improve demand planning models using historical data and forward-looking inputs

• Translate campaigns, launches, and channel plans into realistic demand expectations

• Validate and sense-check inputs from Commercial, Marketing, and Wholesale teams, highlighting assumptions and risks

• Support scenario planning (base / upside / downside) where needed

• Continuously update forecasts based on actual performance

Output: A clear, structured view of expected demand by SKU, channel, and timeframe.

2. Inventory Planning & Purchase Order Recommendations

Own the inventory planning process and support purchase order decision-making.

• Maintain stock cover targets, safety stock levels, and reorder points by SKU

• Build recommended PO quantities and timings based on demand, lead times, and constraints

• Present clear recommendations (buy / hold / reduce) with supporting rationale and risks

• Highlight potential stockouts, excess stock, and cash exposure early

• Balance availability vs. working capital within defined guardrails

Output: Clear, structured recommendations on what we should buy and why.

3. Supply Chain Coordination

Ensure plans translate into effective execution.

• Track supplier timelines, production schedules, and inbound deliveries

• Maintain accurate data on lead times, MOQs, and constraints

• Coordinate with suppliers, freight partners, and 3PLs to ensure smooth product flow

4. Inventory Health & Reporting

Provide visibility on stock position and risk across the portfolio.

• Track stock cover, sell-through, and ageing inventory

• Report regularly on inventory position and key risks

• Highlight required actions clearly and early, before problems compound

5. Cross-Functional Collaboration

Work closely with the Commercial Lead on revenue plans and channel performance; Marketing and Growth on campaigns and demand drivers; and Finance on cash, margin, and inventory exposure. You are responsible for bringing structure and clarity to planning, not just executing requests.

• Experience in supply chain, demand planning, or inventory management within a consumer or ecommerce business

• Strong analytical skills with confidence working in Excel or dedicated planning tools

• Ability to build and maintain structured models and processes from the ground up

• Good commercial awareness — margin, cost, and inventory basics

• Organised, detail-oriented, and comfortable working across teams

• Proactive communicator who surfaces risks early and presents recommendations clearly

What Good Looks Like

• Forecasts are clear, structured, and regularly updated

• Inventory decisions are supported by data and rationale, not instinct

• Risks are identified early and communicated clearly to the Operations Lead and broader team

• Planning becomes more proactive and less reactive over time

• The supplements business feels more controlled, more visible, and more predictable

MARCHON is the UK’s premium performance-lifestyle ecosystem, one brand that helps driven people train, fuel and dress for a life without limits. World-class coaching sits at the centre, backed by certified performance nutrition and movement-ready apparel, all amplified by our beacon gyms. 

Founded by ex-England rugby player and CEO Ollie Marchon, the company has grown from a single HQ club to a true omni-channel offering: the Train app, a fast-scaling supplement line, and physical hubs that bring the experience to life.

We’re still small enough that every new teammate leaves fingerprints on the product, yet the momentum is real. Our 2026 plans are ambitious to say the least, as we make a step-change in evolving our ecosystem between training, supplements and apparel. 

If you care about high standards, straight talk and making a visible impact, you’ll feel at home here. Join us while there’s still room to shape the journey.