Senior Manager, Customer Supply Chain Manager - Walmart

About the Team

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.

About the Role

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.

What You’ll Accomplish

End-to-End Forecasting, Replenishment & CPFR

• 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.

Retail Operations Leadership

• 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.

Customer Relationship Management

• 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.

Strategic Planning & Continuous Improvement

• 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.

Tools, Reporting & Analytics

• 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.

What Success Looks Like

• 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.

This Should Describe You

• 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.

Here’s Who You’ll Work With

Reporting Structure

• 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.

Cross-Functional Partners You will collaborate daily with teams across Mammoth Brands, including:

• Demand Planning – alignment on Supply Plan inputs, event management, forecast accuracy, and IBP.
• Supply Planning & Operations – ensuring capacity, production, transportation, and fulfillment readiness for Walmart.
• Commercial / Sales – aligning on business priorities, revenue drivers, and item-level strategies for Harry’s, Flamingo, Lume, and Mando.
• Finance – supporting inventory health, demand assumptions, and chargeback reconciliation.
• 3PLs & Transportation Teams – supporting flow-of-goods, shipment accuracy, and root-cause resolution for operational issues.

External Partners This is a external-facing role. You will work directly with:

• Walmart Replenishment Managers – serving as their primary operational contact and strategic replenishment partner.
• Walmart Supply Chain & Merchant Support Teams – collaborating on inventory flow, modular changes, event readiness, and operational troubleshooting.
• 3rd Party Store Operations Partners – ensuring seamless communication, field execution, and compliance with Walmart operational expectations.
• Logistics & Retail Technology Partners – supporting inventory visibility, data pipelines, and supply chain performance tools.

Benefits and perks

• Medical, dental, and vision coverage
• 401k match
• Equity in Mammoth Brands 
• Flexible time off and working hours
• Wellness and L&D stipends
• 4 weeks sabbatical after 5 years, 6 weeks after 10 years, and 8 weeks after 15 years 
• 20 fully paid weeks off for parents who give birth, or 16 fully paid weeks off for all other paths to parenthood
• Fun IRL and virtual events including happy hours, team building events, and parties on our rooftop
• Free products from all of our brands

The Mammoth Brands working model is in-office Tuesday, Wednesday, and Thursday. Our beautiful 70,000 square foot SoHo office is decked out with bagels on Wednesdays and lunch on Thursdays, and fully stocked kitchens with snacks, coffee, and drinks everyday. Can’t forget the free products and the opportunity to have some meetings without Zoom!

We can’t quantify all of the intangible things we think you’ll love about working at Mammoth Brands, like the exciting challenges we tackle, the smart and humble team you’ll get to work with, and our supportive and inclusive culture. That said, our salary ranges are based on paying competitively for our size and industry, and are one part of our total rewards package, which also includes a comprehensive set of benefits and our equity program. The base salary hiring range for this position is $118,000-$147,500, but the final compensation offer will ultimately be based on the candidate’s location, skill level and experience.