Senior Planner

Sonnax Transmission Company

As a part of the global industrial organization Marmon Holdings—which is backed by Berkshire Hathaway—you’ll be doing things that matter, leading at every level, and winning a better way. We’re committed to making a positive impact on the world, providing you with diverse learning and working opportunities, and fostering a culture where everyone’s empowered to be their best.

Who We Are

Sonnax is a leading provider of innovative transmission and drivetrain solutions, serving the automotive aftermarket with high-quality products and engineering expertise. As part of Marmon, a Berkshire Hathaway company, Sonnax combines a strong legacy of innovation with the resources of a global organization.

What You’ll Do

The Senior Planner develops and maintains production plans that support manufacturing operations, material availability, and customer demand. This role uses Material Requirements Planning (MRP) systems to balance supply and demand, coordinate with Purchasing and Manufacturing, and manage production schedules to ensure timely delivery and efficient inventory management.

• Develop and maintain production plans, firm scheduling horizons, and production schedules to support operational efficiency and customer requirements.
• Support Sales and Operations Planning (S&OP) and Sales and Operations Execution processes.
• Analyze inventory levels, product demand, reorder points, economic order quantities, and safety stock to balance product availability with inventory costs.
• Partner with Sales, Product Line Management, Marketing, Purchasing, and Manufacturing to improve forecast accuracy, material availability, and on-time delivery.
• Monitor material supply and demand, evaluate MRP and Master Production Schedule (MPS) exception messages, and coordinate necessary schedule adjustments.
• Balance customer requirements with manufacturing capacity, material availability, and other production constraints.
• Coordinate subcontracted services and products, including supplier communication, order execution, and performance expectations.
• Evaluate insourcing and outsourcing options based on customer needs, production capacity, and internal constraints.
• Assess material and capacity requirements for new product introductions, including bills of material, cut-in dates, and build verification.
• Track backorders, communicate status updates, and work with department leaders to resolve scheduling issues.
• Manage the review and approval workflow for existing product customer forecast changes in Monday.com.
• Lead quarterly and semiannual internal forecast reviews for existing products.
• Support continuous improvement and Lean initiatives to improve planning processes, production efficiency, and cross-functional collaboration.
• Perform other duties as assigned.

What You'll Need

• Bachelor's degree preferred, with six or more years of experience in manufacturing planning, production scheduling, material planning, or supply chain.
• Experience in production planning, material requirements planning, inventory management, and production scheduling.
• Strong analytical, organizational, communication, and problem-solving skills, with attention to detail.
• Ability to collaborate effectively across Manufacturing, Purchasing, Sales, and other cross-functional teams.
• Proficiency in Microsoft Office, particularly Excel and Outlook.
• Ability to work in manufacturing environments and wear required personal protective equipment, including safety eyewear and steel-toed shoes.

Preferred Qualifications

• Experience with precision metal fabrication, industrial products, or machined assemblies.
• Familiarity with Epicor Kinetic or similar manufacturing ERP systems.
• Knowledge of continuous improvement, Six Sigma, or Lean methodologies; relevant certification is a plus.

What You’ll Gain

• The opportunity to influence production planning, inventory management, and manufacturing performance.
• Exposure to cross-functional operations spanning manufacturing, purchasing, sales, and supply chain.
• The opportunity to drive continuous improvement initiatives that support operational efficiency and customer satisfaction.
• A role contributing directly to production execution, product availability, and customer delivery commitments.

Pay Range:

68,000.00 - 102,000.00

We offer a comprehensive benefits package that may include medical, dental, vision, 401k matching, and more!

Following receipt of a conditional offer of employment, candidates will be required to complete additional job-related screening processes as permitted or required by applicable law.

We are an equal opportunity employer, and all applicants will be considered for employment without attention to their membership in any protected class. If you require any reasonable accommodation to complete your application or any part of the recruiting process, please email your request to careers@marmon.com, and please be sure to include the title and the location of the position for which you are applying.