Senior Supply Chain Planner

Company Description Guardant Health is a leading precision oncology company focused on guarding wellness and giving every person more time free from cancer. Founded in 2012, Guardant is transforming patient care and accelerating new cancer therapies by providing critical insights into what drives disease through its advanced blood and tissue tests, real-world data and AI analytics. Guardant tests help improve outcomes across all stages of care, including screening to find cancer early, monitoring for recurrence in early-stage cancer, and treatment selection for patients with advanced cancer.

For more information, visit  and follow the company on Linked In, X (Twitter) and Facebook. The Senior Planner owns supply chain planning for assigned product lines in a fast-scaling biotech environment. This role requires an experienced, independent planner who drives forecast accuracy, manages material requirements end-to-end, and leads continuous improvement in planning, scrap reduction, and product launch execution. The Senior Planner will work across Engineering, Manufacturing, Quality, and Finance to ensure material availability, optimize inventory, and drive process improvements.

This is a high-impact role where planning decisions directly affect laboratory service level, manufacturing efficiency, and patient testing turnaround time.

Essential Duties and Responsibilities:

Planning, Forecasting & Requirements Management
· Own MRP (Materials Requirements Planning) for assigned product lines and drive forecast accuracy improvement (target 85%+)
· Identify and escalate forecast variance issues; investigate and propose corrective actions and root cause solutions
· Proactively forecast material shortages and supply chain risks 6-8 weeks in advance; maintain forward-looking shortage pipeline with mitigation plans
· Create and manage material purchasing timelines aligned to manufacturing schedules and site/lab replenishment requirements

End-of-Life Management & Scrap Reduction
· Lead end-of-life planning for obsolete or discontinued products; identify and liquidate excess inventory to minimize scrap
· Analyze scrap drivers (quality, waste, damaged goods, expiration) and propose process or sourcing improvements to reduce scrap rates
· Coordinate disposal of obsolete or non-conforming material; document financial impact and lessons learned
· Product Launches & Manufacturing Support
· Support manufacturing readiness for new product launches; validate BOMs, coordinate material availability, and create launch work orders plans
· Coordinate with Engineering, Quality, and Warehouse on material staging, validation, and fulfillment readiness
· Ensure material accuracy and traceability through SOP compliance; escalate supply chain blockers that could delay launches

Continuous Improvement & Process Optimization
· Own KPIs for product lines (forecast accuracy, months of supply, inventory accuracy, on-time delivery, scrap rate) and create dashboards to drive visibility
· Identify planning process inefficiencies; document SOPs, decision criteria, and lessons learned from shortages and scrap events
· Propose and implement system improvements (Oracle, APEX, MRP tools) to automate planning, reduce manual effort, and improve accuracy
· Lead process improvements that balance inventory security vs. carrying cost; target cost savings through optimization

Cross-Functional Coordination & Problem-Solving
· Partner with Engineering, Manufacturing, Quality, Warehouse, and Finance on planning issues, product changes, and supply chain risks
· Investigate root causes of planning failures (stockouts, scrap, forecast misses); make decisions within authority and escalate appropriately
· Communicate planning status, risks, and recommendations…