Senior Planner

Onto Innovation is a leader in process control, combining global scale with an expanded portfolio of leading-edge technologies that include: 3D metrology spanning the chip from nanometer-scale transistors to micron-level die-interconnects; macro defect inspection of wafers and packages; metal interconnect composition; factory analytics; and lithography for advanced semiconductor packaging. Our breadth of offerings across the entire semiconductor value chain helps our customers solve their most difficult yield, device performance, quality, and reliability issues.

Onto Innovation strives to optimize customers’ critical path of progress by making them smarter, faster and more efficient.

The Master Planner / Buyer is responsible for end-to-end master planning, scheduling, and purchasing of production materials. This role performs forward-looking demand analysis against backlog, sales forecast, and historical consumption and ensures optimal inventory levels and on-time material availability. The Master Planner / Buyer works cross-functionally with Production, Sales, Engineering, Quality, and the corporate purchasing team in Milpitas to support uninterrupted production, leverage corporate bulk purchasing agreements, and drive continuous improvement.

This role operates in a recently restructured Materials function and partners closely with corporate purchasing in Milpitas; comfort with ambiguity and a process-builder mindset are important.

• Perform master planning against backlog, forecast, and historical consumption to project demand beyond the supplier lead-time horizon.
• Establish and maintain Plan-for-Every-Part (PFEP) parameters: lead time, MOQ, safety stock, reorder points, and order policy.
• Conduct rough-cut capacity reviews and actively participate in S&OP / SIOP cycles.
• Translate the master plan into a Master Production Schedule (MPS) and detailed material plans, releasing planned orders accordingly.
• Analyze demand forecasts, production plans, and inventory levels to prevent shortages or excess stock.
• Monitor material availability and proactively resolve supply constraints.

• Issue purchase orders in accordance with MRP signals, contracts, and company policies.
• Lead supplier negotiations on price, lead time, MOQ, payment terms, and contract terms; drive lead-time reduction initiatives and cost-saving opportunities.
• Own supplier scorecards (on-time delivery, quality PPM, NCR rate, responsiveness) and conduct Quarterly Business Reviews with key vendors.
• Drive Corrective Action Plans (8D / CAPA) when suppliers miss performance targets; track containment, root cause, and verification of effectiveness.
• Identify single-source risks and develop qualified second sources in partnership with Engineering and Quality; maintain a supplier risk register for critical commodities.
• Partner with Quality on supplier onboarding, supplier audits, ISO compliance verification, first-article approvals, and supplier agreements.
• Lead recovery efforts when vendors miss commits—pull-ins, alternate sourcing, premium freight decisions, and customer-impact communication.
• Monitor contract expirations, payment terms, MOQ/lead-time clauses, and price-change notifications; push back on unjustified price increases with data.
• Maintain accurate vendor master data in Oracle ERP (lead times, MOQs, prices, certifications) so MRP signals reflect reality.

• Maintain optimal inventory levels while meeting service and production requirements.
• Analyze inventory turns, excess/obsolete inventory, and slow-moving materials.
• Support cycle counts, inventory accuracy initiatives, and root cause analysis of discrepancies.

• Coordinate with the Milpitas corporate purchasing team to leverage bulk purchasing agreements, consolidated contracts, and preferred-vendor programs.
• Identify Tucson‑specific spend that can be rolled into corporate buys for improved pricing leverage.
• Escalate vendor and contract issues to Milpitas where corporate-level intervention is appropriate.

• Coor…