Sr. Merchandise Planner

Company: ThirdLove
Location: San Francisco
Posted on: February 15, 2026

Job Description:

Job Description Job Description Who We Are Thirdlove disrupted the lingerie industry by empowering women to find their perfect fit online with our innovative Fitting Room® quiz and is one of the original brands to operate 100% direct-to-consumer. All design and R&D is done in-house, and our extensive and complex supply chain is fully managed by our team. Inclusivity is at the core of who we are and how we serve our customers and build our teams. Traditionally, women were given a choice between two options when it came to their bras and underwear: Be sexy, or be comfortable. Our Cofounders: Heidi Zak, and Ra'el Cohen, thought that was outdated too — so, in 2013, they created Thirdlove — a third, better option, which doesn't force us to choose between being sexy or comfortable. What Our Team Embodies Our culture is collaborative, fast-paced, and data-driven, and we were most recently recognized with the Great Place to Work certification for the 5th year in a row. This recognition is given to a very small percentage of companies who apply for it and determined by employees' real-time reports of their company culture. Earning this designation demonstrates to us that our team at Thirdlove is inspired by our mission, engaged in their everyday work, and enjoy partnering with our teammates and customers. If you want to impact millions of people, find your fit, and propel your career forward, we'd love to hear from you. What We Are Looking For The Senior Merchandise Planner drives demand forecasting and aligns tops-down/bottoms-up inventory plans for assigned ThirdLove product categories. They identify risks and opportunities, manage data and size curve integrity, and oversee SKUs and purchase orders. This role determines optimal investment levels across styles, sizes, and channels to hit sales and margin targets in an omnichannel environment. Responsibilities include aligning cross-functional plans and product-level forecasting/receipt plans. This role requires strong cross-functional partnership, high proficiency in data analysis, and the ability to clearly and succinctly present detailed sales and inventory insights. Key to success is using strategy, insights, and intuition to speak to data and influence diverse audiences. The ideal candidate has strong analysis skills, experience with forecasting systems and OTB processes, and channel experience in a growing and dynamic retail landscape. The Senior Merchandise Planner must be an excellent, proactive communicator, enthusiastic to learn, and detail/accuracy-oriented. They must ask questions, share knowledge, and thrive in a collaborative, fast-paced team environment. What You Will Own And How You Will Make A Difference Category & Product Planning: Own monthly sales/inventory forecasts for assigned categories using statistical models and market insights. Incorporate bottoms-up trends (sales analysis, competitive data). Communicate forecast deviations (beats/misses) and execute data-driven action plans to leverage opportunities or mitigate risks (e.g., accelerating/canceling receipts, markdowns). Align demand with inventory targets. Size Planning & Optimization: Analyze size-level selling across channels to optimize allocation and reduce stock issues. Rigorously update size curves for continuing styles based on real-time selling; use historical data for new styles. Model and integrate channel-specific size differences (retail vs. ecommerce) into planning/allocation. Inventory Investments & Management: Formulate strategic buy recommendations (initial & reorders) to meet sales forecasts across all channels. Maximize inventory productivity by optimizing turns and meeting KPIs (WOS, Sell-Through, investment targets). Manage the entire inventory lifecycle for maximum profitability. Business Insights & Performance Management: Continuously analyze selling by style, color, and size to understand omnichannel demand. Translate findings into clear, executable action plans (e.g., marketing, allocation shifts, promos) to drive performance. Refine forecasting methodology based on insights to improve accuracy. Channel Expansion & Omnichannel Strategy: Partner with the Associate Director, Inventory Planning, to establish annual/seasonal sales and inventory targets for all existing and expanding channels: Ecommerce (DTC), Retail (brick-and-mortar), Wholesale (external partners), and Amazon. Tools & AI: Develop, optimize, and implement best-in-class processes and tools for omnichannel sales analysis, receipt planning, and dynamic inventory allocation to ensure a seamless and profitable customer experience. Who You Are Minimum 5-7 years merchandise planning or demand planning for an apparel or consumer product company; preferably in intimates or numeric-sizing category. Experienced in demand forecasting and OTB planning in an omnichannel environment (ecommerce, retail and wholesale channels) Strong working knowledge of demand planning tools including enterprise (SAP, Oracle) or online Highly-collaborative cross-functional partner, working with merchandising, production, FP&A, and operations/logistics Ability to analyze large data sets from various sources and make recommendations that drive the business forward. Wizard at analysis and identifying business patterns. Ability to communicate clearly and succinctly to different levels of management to drive action Strong organizational and written and oral communication skills Expert in Intermediate & Advanced Microsoft Excel High level proficiency in GSuite applications (Google Sheets, Docs, Slides) preferred Proficiency in Netsuite ERP preferred Experience implementing new planning/forecasting tools or systems a plus Sense of urgency and ability to prioritize workload. Can manage through ambiguity in a fast-paced environment. ThirdLove Offers You Competitive salary equity Medical/Dental/Vision insurance Paid parental leave Flex time off Discounted and free products Diversity ThirdLove is an equal opportunity employer and values diversity at the company. We do not discriminate on the basis of race, religion, color, national origin, gender, gender identity or expression, sexual orientation, age, genetics, marital status, veteran status, or disability status. ThirdLove is an E-Verify employer and will provide the federal government with your Form I-9 information to confirm that you are authorized to work in the U.S. For more information please visit E-Verify. Compensation 90-120K annual base compensation range

Keywords: ThirdLove, West Sacramento , Sr. Merchandise Planner, Logistics, Transportation & Drivers , San Francisco, California