Assistant Planner Jobs in Riverside, CA (NOW HIRING)

Location: Irvine or Camarillo, Hybrid (Temporary) 2 month contract

Job Summary:

The Sr. Production Planner is an individual contributor responsible for day-to-day supply planning execution within the SIP Business Unit. This role supports wafer start planning, WIP tracking, pre-triangulation meeting preparation, and cross-functional coordination with PLMs, foundry operations, and OSAT partners. The position works under the direction of the Sr. Manager, Planning and Revenue Management and is expected to operate with a high degree of accuracy and ownership in a fast-paced semiconductor supply chain environment.

Key Responsibilities:
Wafer Start Planning and Reporting (35%):

• Prepare and distribute weekly wafer start reports (SIP WW report) to planning manager and relevant stakeholders
• Coordinate wafer starts across Tower Semiconductor FAB2 and FAB3 in alignment with consensus demand and allocation constraints
• Track and maintain WIP material lists by product and lot
• Flag material shortages, capacity constraints, or schedule interruptions to planning manager in a timely manner
• Support wafer start approval workflows with accurate demand and allocation data
  

Pre-Triangulation and Forecast Coordination (25%):

• Facilitate pre-triangulation meetings with regional sales teams (Asia, Japan, Korea, ROA) ahead of the weekly triangulation cycle
• Pull and review turns-remaining data and delta reports from the triangulation tool to surface demand risk and recovery opportunities
• Prepare meeting materials and document action items
• Communicate supply constraints and planning assumptions clearly to sales and PLM stakeholders
• Escalate discrepancies between backlog, sales forecast, and consensus demand to planning manager
  

Inventory Management (20%):

• Monitor finished goods and WIP inventory levels by part number against demand and days-of-inventory (DOI) targets
• Identify excess, aged, or at-risk inventory and escalate disposition recommendations to planning manager
• Support safety stock reviews by product family and flag attainment gaps
• Coordinate with OSAT partners (probe, assembly, test) to track WIP lot status and ensure material is moving through the supply chain on schedule
• Assist with hold lot tracking and NCMR disposition as directed
• Maintain accurate inventory records in SAP ECC/SCM and flag discrepancies for resolution

Data Maintenance and Reporting (20%):

• Maintain accurate planning data in SAP ECC/SCM including material master, backlog, and supply plan records
• Support backlog analysis and snapshot comparisons as directed
• Run standard planning reports and distribute to stakeholders on schedule
• Assist with ad hoc data pulls and supply plan updates as requested by planning manager
  

Minimum Qualifications:

• Bachelor's degree in Supply Chain Management, Industrial Engineering, or related field
• 3-5 years of experience in production planning, supply chain, or operations in a manufacturing environment
• Working knowledge of SAP ECC/SCM
• Experience coordinating with external manufacturing partners (foundry, OSAT) a plus
• Professional certification (CPIM, CSCP) preferred but not required
• Solid understanding of production planning principles and supply chain fundamentals
• Proficiency in SAP ECC/SCM; familiarity with SAC or equivalent planning tools a plus
• Strong attention to detail and ability to manage multiple priorities simultaneously
• Clear, organized communication skills with cross-functional teams (PLM, foundry ops, sales ops)
• Comfortable working independently in a remote environment with minimal supervision
• Familiarity with semiconductor manufacturing concepts (wafer starts, probe, OSAT) preferred
• Strong Excel skills required

The intent of this job description is to describe the major duties and responsibilities performed by incumbents of this job. Incumbents may be required to perform job-related tasks other than those specifically included in this description.

All duties and responsibilities are essential job functions and requirements and are subject to possible modification to reasonably accommodate individuals with disabilities.

We are proud to be an EEO employer M/F/D/V. We maintain a drug-free workplace.

A reasonable estimate of the pay range for this position is $75,000 - $90,000. There are several factors taken into consideration in determining base salary, including but not limited to: job-related qualifications, skills, education and experience, as well as job location and the value of other elements of an employee's total compensation package.

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