Senior Manager, Customer Supply Chain Manager - Walmart

Mammoth Brands (formerly Harry’s Inc.) is the modern CPG company behind brands Harry’s, Flamingo, Lume, Mando, and Coterie. We’re building a new model—and home—brands, founders, and talent looking to solve unmet needs, improve peoples’ lives, and ultimately challenge the status quo. Our mission is to “Create Things People Like More.” Simply put: everything we do should be better than what already exists. If it’s not, we don’t do it. This guides everything we do, from developing the best product experiences, to making Mammoth Brands a great place to work, to exploring innovative ways to give back to our community.

We got our start in 2013 when our co-founders created Harry's. They built the brand differently—online first, prioritizing direct relationships with customers—and in the process learned they’d created something bigger: a playbook and platform that could help other brands grow and scale to their full potential, and a vision to reimagine consumer packaged goods. Today, Mammoth Brands is a growing portfolio of brands and the largest CPG company built in the last 20 years. Even as we grow, we take extra care to maintain the small, scrappy, entrepreneurial culture that helped to get us where we are today: to create a company that people like more, that better serves its customers, employees, and community. As a company, we’re also committed to making a positive impact and have donated over $20 million through our network of nonprofit partners to date. 

The Customer Supply Chain (CSC) team sits within the broader Supply Chain organization and is directly embedded with our Retail partners. As part of Mammoth Brands, we support the end-to-end execution of Harry’s, Flamingo, Lume, and Mando across key retailers.

As the Sr Manager for Walmart, you will own retail operations, forecasting, replenishment, and in-store execution from shelf to supply node. You will be accountable for ensuring best-in-class availability, in-stocks, OTIF performance, and flawless execution for Walmart’s omni-channel business. While this role is primarily Walmart-focused, there may be periodic support across other retailers depending on business needs.

We’re seeking an analytical, collaborative, and execution-obsessed Customer Supply Chain Manager to lead end-to-end supply chain operations for Walmart. This is a high-impact, customer-facing role responsible for CPFR, operational performance management, chargeback mitigation, and partnership with Walmart’s replenishment and supply chain teams.

You will work cross-functionally with Commercial leaders, Demand Planning, Supply Planning, Operations, Finance, and third-party partners to ensure products flow seamlessly through Walmart’s supply chain and onto shelves and digital carts. This role requires strong problem-solving, prioritization, and the ability to convert data into actionable insights and proactive recommendations.

We’re looking for a strategic thinker who can also roll up their sleeves, move quickly, and manage both day-to-day operations and long-term improvements.

• Lead Walmart forecasting & replenishment across all Mammoth Brands (Harry’s, Flamingo, Lume, Mando).
• Manage weekly CPFR processes, ensuring accurate internal inputs and alignment with Walmart’s Supply Plan.
• Conduct weekly replenishment analyses to monitor store inventory health, supply flow, and demand shifts.
• Own Event Management forecasting (promotions, resets, modular changes), new item launches, and end-of-life transitions.
• Identify risks and opportunities related to in-stocks, waste, overstocks, and seasonal dynamics.

• Serve as the go-to expert on Walmart operational processes including fulfillment, warehousing, transportation, in-store operations, modular execution, allowances, and chargebacks.
• Own OTIF and operational KPI tracking for Walmart; analyze root causes and lead corrective actions.
• Manage chargeback mitigation and recovery through cross-functional collaboration and retailer insights.
• Coordinate with Store Operations partners to identify and drive improvements in on-shelf execution.

• Act as the primary point of contact for Walmart Replenishment Managers and Walmart Supply Chain stakeholders.
• Translate large, complex datasets and Walmart insights into clear recommendations that drive shared growth.
• Build and maintain strong relationships with internal and external partners, including 3PLs, HQ brokers, and Walmart’s supply chain & replenishment teams.

• Serve as a key input in our commercial forecast with Demand Planning and Commercial teams.
• Identify gaps in current operational processes and build strategic roadmaps for improvement.
  Support and/or lead cross-functional projects that drive operational efficiency and demand/supply alignment.
• Share & apply best practices across channels and retailers when appropriate.

• Develop and maintain reporting, dashboards, and operational scorecards tied to KPI performance (e.g., OTIF, in-stocks, weeks of supply, supply plan accuracy).
• Leverage external Walmart systems as well as internal ERP tools, including:
• Retail Link, Luminate, DSS, Nova, Item 360, Aspen, SupplierOne, Scintilla, SPS Commerce, SAP
• Use data to generate insights on inventory flow, supply disruptions, and customer-facing performance.

• Walmart in-stock and OTIF performance consistently at or above target.
• Clear, proactive forecasting and replenishment recommendations that improve Supply Plan accuracy.
• Strong, trusted working relationships with Walmart Replenishment Managers and internal cross-functional teams.
• Reduction in chargebacks through root-cause identification and improved execution.
• Streamlined reporting and planning tools that elevate visibility and decision-making.
• Demonstrated ability to manage both daily operations and long-term strategic projects.

• 5+ years of experience in retail operations, customer supply chain, supply chain management, or retail sales.
• Strong understanding of Walmart tools & resources (Luminate, Retail Link, Nova, Item 360, Aspen, SupplierOne, Scintilla).
• Deep knowledge of forecasting & replenishment, demand/supply planning, store operations, inventory management, and logistics.
• Skilled at managing large datasets and using Excel, analytics tools, and/or AI tools to uncover insights.
• Highly organized project manager with the ability to prioritize and lead through ambiguity.
• Strong communicator capable of translating complex analytics into simple operational actions.
• Comfortable collaborating across teams—Demand Planning, Sales, Supply Planning, Operations, Finance—and with external partners.
• Self-starter who thrives in a fast-paced environment and can balance strategic thinking with hands-on execution.

• You will report directly to our Sr Director, Customer Supply Chain within the broader Mammoth Brands Supply Chain organization.  
• You will work in close partnership with the Walmart Commercial (Sales) team, with a dotted line to our Head of Walmart, supporting joint business planning, forecasting inputs, and operational execution.