Master Scheduler

Job Title: Master SchedulerJob Description

The Master Scheduler takes full ownership of developing and maintaining the Master Production Schedule in a plastic injection molding facility with a diverse customer portfolio. This role focuses on creating production plans that effectively manage labor, equipment, and materials to achieve plant efficiency targets. The position is highly analytical and requires close collaboration with internal teams, customers, buyers, and planners to balance supply, demand, capacity, and inventory while meeting customer service and delivery objectives.

Responsibilities

• Prepare and maintain the Master Production Schedule (MPS) by working cross-functionally with internal and external stakeholders to drive alignment, delivery performance, and inventory results within the business unit.

• Analyze supply and demand trends, evaluate key factors, and develop and implement methods to improve service levels, inventory turns, and production efficiency.

• Develop standard procedures for scheduling and related strategies, and lead continuous improvement initiatives in planning and scheduling processes.

• Use statistical analysis methods to develop production plans that align capacity, materials, and labor with customer demand.

• Compare forecasts to historical demand and identify deviations to improve forecast accuracy and demand planning.

• Develop and maintain product groupings, individual product forecasts, demand plans, and production schedules to support a diverse customer portfolio.

• Implement production and forecasting strategies that meet customer demand while maintaining minimum effective inventory levels.

• Report backlog status and ensure alignment with the Master Production Schedule, proactively reviewing material supply and demand to determine appropriate push/pull actions to support manufacturing.

• Analyze, improve, and control MRP settings to support efficient material flow into and out of the facility.

• Schedule daily tool and die changes to align with the Master Production Schedule and broadcast daily production plans and priorities for teams across all shifts to meet customer demand.

• Create and release daily work orders to the production group, and verify work order completions as they are finished.

• Review and approve all incoming purchase orders within each product's specified lead times and minimum order quantities.

• Host daily reviews with Customer Service, Production, and Shipping to coordinate the status of open orders, ensuring On Time In Full (OTIF) shipment and expediting or rescheduling orders as needed.

• Integrate sales orders into the production schedule and coordinate the availability of materials, supplies, and resources to meet required delivery dates.

• Adjust and reflow orders as necessary to align with production outlook and changing customer demand.

• Serve as a key contact for customers, providing timely, detailed, and professional updates to customer inquiries regarding order and production status.

• Proactively communicate with customers on order status and any changes that may affect delivery or production plans.

• Analyze, map, and determine process requirements related to planning and scheduling, and support the development and implementation of standardized processes and procedures.

• Perform other duties or tasks as necessary to support overall company objectives in supply chain, planning, and production scheduling.

Essential Skills

• Strong experience in supply chain planning, production scheduling, and manufacturing operations.

• Bachelor's degree in a relevant field or at least 6 years of experience in supply chain planning, coordination, and production scheduling.

• Hands-on experience with supply chain planning, production coordination, and scheduling in a manufacturing environment.

• Strong knowledge of manufacturing operations, capacity management, distribution, and customer service.

• Strong knowledge and practical experience with MRP/ERP systems.

• Experience with demand and capacity planning and scheduling.

• Advanced proficiency with Microsoft Excel, including strong statistical and spreadsheet analytical skills.

• Excellent written and verbal communication skills to interact effectively with internal teams and external customers.

• Strong analytical and problem-solving abilities, particularly in evaluating supply, demand, and capacity constraints.

• Ability to manage and prioritize multiple changing deliverables in a fast-paced environment.

• Ability to analyze, map, and determine process requirements for planning and scheduling activities.

• Experience developing and implementing standardized processes and procedures in a production or supply chain environment.

Additional Skills & Qualifications

• APICS CPIM or CSCP certification is a strong plus.

• Experience with Epicor Mattec or similar MRP/ERP or Epicor-based systems is highly desirable and can enable faster ramp-up.

• Experience working with ERP systems in manufacturing, including MRP/ERP platforms.

• Previous leadership experience in planning, scheduling, or supply chain functions is preferred.

• Background in plastic injection molding or similar discrete manufacturing environments is beneficial.

• Demonstrated ability to collaborate cross-functionally with customer service, production, shipping, buyers, and planners.

• Strong attention to detail and commitment to accuracy in forecasting, scheduling, and order management.

Work Environment

This role is based onsite in Long Beach in a plastic injection molding manufacturing facility that serves a diverse customer portfolio. You will work closely with production, customer service, shipping, and supply chain teams in a fast-paced environment that requires frequent coordination across shifts. The position involves daily use of MRP/ERP systems, potentially including Epicor Mattec, and advanced use of Microsoft Excel for statistical analysis, forecasting, and scheduling. The environment emphasizes collaboration, continuous improvement, and efficient material and production flow to meet customer demand and plant efficiency targets.

Job Type & Location

This is a Contract to Hire position based out of Long Beach, CA.

Pay and Benefits

The pay range for this position is $38.00 - $53.00/hr.

Individual compensation offered for this position within this range will depend on many factors, including qualifications, skills, relevant experience, job knowledge, geographic location, internal equity, and other pertinent job-related factors.

Eligibility requirements apply to some benefits and may depend on your job classification and length of employment. Benefits are subject to change and may be subject to specific elections, plan, or program terms. If eligible, the benefits available for this temporary role may include the following: - Medical, dental & vision - Critical Illness, Accident, and Hospital - 401(k) Retirement Plan - Pre-tax and Roth post-tax contributions available - Life Insurance (Voluntary Life & AD&D for the employee and dependents) - Short and long-term disability - Health Spending Account (HSA) - Transportation benefits - Employee Assistance Program - Time Off/Leave (PTO, Vacation or Sick Leave)

Workplace Type

This is a fully onsite position in Long Beach,CA.

Application Deadline

This position is anticipated to close on Sep 15, 2026.

About Aston Carter

Aston Carter provides world-class corporate talent solutions to thousands of clients across the globe. Specialized in accounting, finance, human resources, talent acquisition, procurement, supply chain and select administrative professions, we extend the capabilities of industry-leading companies. We draw on our deep recruiting expertise and expansive network to meet the evolving needs of our clients and talent community with agility and excellence. With offices across the U.S., Canada, Asia Pacific and Europe, Aston Carter serves many of the Fortune 500. We are proud to be a ClearlyRated Best of Staffing® Platinum Award winner for both client and talent service.

The company is an equal opportunity employer and will consider all applications without regard to race, sex, age, color, religion, national origin, veteran status, disability, sexual orientation, gender identity, genetic information or any characteristic protected by law.

If you would like to request a reasonable accommodation, such as the modification or adjustment of the job application process or interviewing process due to a disability, please email View email address on click.appcast.io (%View email address on click.appcast.io) for other accommodation options.

San Francisco Fair Chance Ordinance: Pursuant to the San Francisco Fair Chance Ordinance, for all positions located in the city and county of San Francisco, we will consider for employment qualified applicants with arrest and conviction records.

Massachusetts Lie Detector: It is unlawful in Massachusetts to require or administer a lie detector test as a condition of employment or continued employment. An employer who violates this law shall be subject to criminal penalties and civil liability.

Use of Artificial Intelligence (AI): We may use Artificial Intelligence (AI) to support parts of our hiring process, including sourcing, screening, and evaluating candidates. AI helps assess applications and qualifications, but final decisions are made by our hiring team. By applying, you acknowledge and agree that your application may be reviewed using AI tools.