Business Planning Manager (SIOP/Capacity)

Business Planning Manager'

Mattawan, Michigan

Shape the future of production performance and supply chain strategy! We’re seeking a Business Planning Manager (SIOP/Capacity) to lead demand, supply, and capacity alignment in a fast-paced Tier 1 automotive environment—driving the processes that keep our operations efficient, responsive, and ready for growth.

We pride ourselves on delivering best-in-class products that make a difference. If you’re looking for a role that challenges you, inspires creativity, and rewards excellence, we want to hear from you!

What you will receive:

· Competitive Wages

· Excellent medical insurance (coverage effective on your first day of employment)

· Dental and vision coverage

· Paid life insurance and disability assistance

· Employee Assistance Program

· 401k with a company contribution

· Excellent company culture

Responsibilities:

• Lead creation and execution of the weekly/monthly SIOP file, interpreting business needs and communicating requirements to applicable teams.
• Facilitate cross-functional SIOP meetings, ensuring alignment between demand, supply, and financial plans.
• Translate OEM/customer forecasts and EDI releases into actionable capacity, scheduling, and labor plans.
• Build and maintain capacity models, scheduling worksheets, and scenario planning tools in collaboration with cross-functional teams.
• Drive execution of supply plans through purchasing and production scheduling teams.
• Collaborate with manufacturing to establish appropriate minimum order quantities (MOQs) to support efficiency.
• Ensure ERP parameters and customer EDI data remain accurate through ongoing monitoring and updates.
• Provide executive-level reporting on forecast accuracy, capacity utilization, supply risks, and customer delivery performance (OTIF).
• Lead monthly SIOP reporting to measure effectiveness across forecast accuracy, inventory optimization, and customer satisfaction.
• Support continuous improvement initiatives in demand, capacity, and supply planning processes, with focus on efficiency, scrap reduction, and delivery performance.
• Perform additional responsibilities as assigned to support supply chain and business objectives.

Requirements

• Associate's degree in business or related field.
• Minimum 3–5 years of experience in SIOP, demand planning, supply planning, or capacity planning within a manufacturing environment; automotive Tier 1 experience strongly preferred.
• Strong analytical skills with demonstrated ability to identify and capture opportunities through data analysis; Lean Six Sigma Green/Black Belt preferred.
• Hands-on experience with ERP systems; IQMS experience preferred. Experience with EDI releases and OEM customer portals strongly preferred.
• Advanced Microsoft Office skills; experience with Power BI or similar analytics tools strongly preferred.
• Proven ability to lead and influence across organizational boundaries; prior experience managing or coaching a team is a plus.
• Strong business acumen with a collaborative, cross-functional approach.
• Financial acumen and ability to connect SIOP outputs to operational KPIs.
• Excellent communication skills with the ability to build strong relationships and drive results in a fast-paced automotive environment.

Preferences:

• Bachelor’s degree in business or related field.
• APICS/ASCM CPIM or CSCP certification strongly preferred.
• Experience in injection molding and assembly manufacturing environments a plus.
• Demonstrated success implementing or improving SIOP processes in a customer-driven, high-volume environment.

Western Diversified Plastics is an equal opportunity employer. We are committed to providing a work environment that is free from discrimination and harassment. We do not discriminate against any employee or applicant for employment based on race, color, religion, sex, national origin, age, disability, genetic information, sexual orientation, gender identity, or any other characteristic protected by law.

We are committed to providing reasonable accommodations to individuals with disabilities.

If you require assistance or an accommodation to complete the application process, please contact Human Resources at 269-668-4600. Requests will be kept confidential and handled in accordance with applicable laws.

Western Diversified Plastics participates in E-Verify to confirm work authorization. For more information, visit www.e-verify.gov.