Planning and Merchandising Manager

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You will be working for the high growth womenswear brand Sisters & Seekers within a creative and visionary team, all striving towards taking the brand to the next level. We are based near Chester but have a global reach with customers all over the world.

We are looking for an ambitious, driven and passionate individual who is looking to develop their career in a dynamic and expanding team at Seekers HQ. This position is a full-time role based in the office through Monday to Friday, with the opportunity to immerse yourself in the lively Sisters & Seekers team, experience staff and community events, and if you’re camera ready, to be a part of our viral Tik Tok videos!

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We’re looking for a highly analytical and commercially minded Planning & Merchandising Manager to lead the forecasting, stock planning, and commercial performance of our product ranges — ensuring every collection lands with the right depth, balance, and profitability to hit our revenue goals.

This role will own the full commercial planning lifecycle, partnering closely with Buying, Design, Growth, Finance, and our wider operations teams.

You’ll be the central point for demand logic, stock strategy, and commercial visibility — ensuring we minimise risk, maximise opportunity, and enable the brand to scale with confidence.

You’ll bring a data-first mindset, a sharp commercial eye, and a proactive approach to problem solving — ensuring our product strategy not only looks strong creatively, but performs exceptionally well in the market.

• Own the forward demand plan across categories, markets, and channels — ensuring alignment with the overall revenue target.
• Lead weekly reforecasting, identifying upside opportunities and risk areas early.
• Build seasonal and monthly contribution plans, ensuring a commercially balanced assortment.
• Translate performance signals, historic trends, and campaign insights into actionable forecasts.

• Partner with the Head of Buying to shape range structure, category mix, and buy depth.
• Provide commercially grounded recommendations during range building and buy sign-off.
• Analyse previous sell-through, market performance, and seasonality to inform future buys.
• Ensure size curves, price points, and stock weighting support product strategy and financial goals.
• Own the business-wide view of stock performance, health, and risk.
• Identify slow movers, overbuys, ageing inventory, and gaps — proposing corrective actions quickly.
• Build and manage markdown strategies, clearance proposals, and re-merchandising plans.
• Protect cashflow by ensuring intake and stock cover align with commercial priorities.

• Lead the weekly Trading Review with Buying, Growth, and Finance.
• Monitor sell-through, rate of sale, margin performance, category contribution, and stock position.
• Recommend trading actions such as reorders, stock reallocation, campaign support, and repricing.
• Ensure product launches have clear commercial expectations and success criteria.

• Develop replenishment frameworks for core lines, repeat performers, viral products, and channel-specific strategies.
• Set and manage replenishment triggers based on velocity, weeks cover, and demand forecasting.
• Work closely with Growth to align marketing pace and spend with available stock levels.
• Ensure our global markets have the right stock depth to support their growth.

• Maintain accurate forecasting tools, dashboards, and stock planning documents.
• Build reporting frameworks that provide clarity to senior leadership and cross-functional teams.
• Improve planning processes, ensuring commercial visibility is consistent and reliable across departments.
• Support Finance with OTB management, intake planning, and stock investment clarity.

• Work with Buying & Design to ensure commercial insight is embedded into product development.
• Partner with Growth & eCommerce to align trading actions and campaign…