Product Line Manager - Planning & Sourcing

Seamus Golf is a Portland-based company dedicated to crafting premium, handcrafted golf accessories inspired by the traditions and artistry of the game. Known for exceptional quality, distinctive design, and authentic craftsmanship, Seamus Golf creates products that elevate the golf experience while celebrating individuality and style. Our team is passionate about delivering innovative products and outstanding customer experiences.

Seamus Golf is seeking a Product Line Manager - Planning & Sourcing to lead product planning, sourcing, forecasting, inventory strategy, costing, and vendor relationships across wholesale and e-commerce channels. This position determines what products are made, when they are produced, who produces them, and at what cost. The Product Line Manager is responsible for maintaining the product calendar, evaluating product concepts, managing SKU-level planning, approving product costs, and ensuring new ideas are commercially viable, operationally feasible, and aligned with the Seamus Golf brand.

This role also provides cross-functional leadership throughout the product lifecycle by establishing clear deliverables, ownership, and timelines.

At Seamus Golf, our culture is built on teamwork, creativity, accountability, and entrepreneurial drive. We value individuals who take ownership of their work, make informed business decisions, and contribute to the success of the broader team.

• Bachelor’s degree in business, supply chain management, merchandising, product development, operations, or a related field is preferred.
• Four to six years of relevant experience in product line management, product planning, sourcing, or a related area is required.
• Knowledge of product planning, demand forecasting, inventory management, costing, and margin analysis.
• Strong knowledge of product planning, sourcing, production, inventory management, and the product lifecycle.
• Ability to analyze demand, sales, costs, margins, and inventory data to make informed decisions.
• Strong vendor-management and negotiation skills across domestic and international partners.
• Ability to manage multiple projects, establish clear timelines, and hold cross-functional teams accountable.
• Strong written and verbal communication skills with the ability to collaborate across departments.
• Proficiency with spreadsheets, databases, project management systems, reporting tools, and Microsoft Office applications.
• Ability to maintain confidentiality, work independently, supervise others, and travel as needed.

• Owns the product creation calendar and lifecycle tracker, setting timelines, milestones, and owners so every active product's stage, status, and next steps are visible across teams.
• Serves as project owner across the lifecycle, coordinating design, development, production, and sales to launch on time and within cost.
• Runs weekly cross-functional status meetings to catch timeline slippage early and evaluates requests for exceptions on their business merit.

• Forecasts demand and maintain SKU-level plans across wholesale and e-commerce channels.
• Builds production and inventory plans based on forecasts, margin goals, capacity, and material availability, balancing core production with custom and special orders.
• Monitors inventory, sell-through, and replenishment, and partners with sales and e-commerce on actions to improve inventory movement.
• Reviews, approves, and challenges product costing to protect margin before production.

• Administers the product concept intake process, prioritizing opportunities by business value, operational feasibility, and strategic fit.
• Partners with sales and…