Senior Manager, Customer Supply Chain Manager - Walmart

Mammoth Brands • New York, NY

3d • $118,000 - $147,500 • Hybrid

About The Position

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.

Requirements

• 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.

Responsibilities

• 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.

Benefits

• 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

What This Job Offers

• Job Type: Full-time
• Career Level: Mid Level
• Education Level: No Education Listed