Senior Manager, SIOP (Sales, Inventory & Operations Planning)

Senior Manager, SIOP (Sales, Inventory & Operations Planning)

Location: Fremont, CA

About Us
G&H is a world leader in optical designing, testing and manufacturing. As experts in the technology of light, G&H works with customers to provide optical systems, assemblies, and components for demanding applications.

Headquartered in Ilminster Somerset, UK with primary operations in the USA and Europe, G&H is recognized for the breadth of their acousto-optic, electro-optic, crystal-optic, fiber optic, and precision optic products. G&H is recognized as the preferred source for OEMs in the life sciences, industrial, and aerospace and defense industries, with a history of quality and excellence that dates back over seventy-five years.

 G&H offers exciting and rewarding opportunities for motivated and talented people to join a team of like-minded, highly skilled colleagues who want to grow and succeed with our company.

Hiring talent to complement and grow our current teams’ skills and capabilities is a strategic priority to enable our plans for growth.

Our seven business locations in the United States and four UK-based businesses employ across a broad range of functions including engineering and process, manufacturing, product management, supply chain and customer services, quality assurance, continuous improvement, compliance and finance.

The Role

We are seeking a Senior Manager, SIOP, to lead and mature the end-to-end Sales, Inventory, and Operations Planning process at our Fremont site. This role is responsible for aligning demand, supply, and financial plans to enable predictable execution, improved delivery performance, and optimized inventory.

This leader will act as the central integrator across Sales, Operations, Finance, Engineering, and Supply Chain, bringing structure, visibility, and accountability to planning processes in a high-mix, technically complex manufacturing environment.

The ideal candidate combines strong analytical capability, operational credibility, and the ability to drive cross-functional alignment in a fast-paced, evolving organization.

Key Responsibilities

SIOP Leadership & Process Ownership

• Own and lead the monthly SIOP cycle, including demand review, supply review, pre-SIOP, and executive SIOP meetings. 
• Establish and continuously improve a standardized, disciplined SIOP process aligned to business growth and operational needs. 
• Drive alignment between demand forecasts, production capacity, and financial targets. 

Demand & Supply Planning Integration

• Partner with Sales and Product Management to develop accurate demand forecasts, including pipeline analysis and scenario planning. 
• Collaborate with Operations and Supply Chain to translate demand into feasible production and procurement plans. 
• Balance capacity constraints, lead times, and inventory strategies to optimize service levels and cost. 

Inventory Optimization

• Develop inventory strategies to reduce excess and obsolete inventory while maintaining service levels. 
• Establish target inventory levels, safety stock policies, and planning parameters. 
• Monitor and drive improvements in inventory turns, working capital, and material availability. 

Cross-Functional Alignment

• Act as the primary point of integration between Sales, Operations, Finance, Engineering, and Procurement. 
• Facilitate decision-making by surfacing trade-offs, risks, and opportunities. 
• Ensure alignment between operational plans and financial forecasts. 

Data, Analytics & Systems

• Develop and maintain reporting dashboards for key SIOP metrics (forecast accuracy, on-time delivery, backlog health, inventory performance, capacity utilization). 
• Leverage ERP/MRP systems and planning tools to improve visibility and decision-making. 
• Drive data integrity and standardization across planning inputs. 

 Risk Management & Scenario Planning

• Identify risks related to demand volatility, supply constraints, and capacity limitations. 
• Lead scenario planning and contingency planning efforts. 
• Proactively escalate issues and recommend mitigation strategies to leadership. 

Team Leadership & Capability Building

• Build and develop SIOP/planning capabilities within the site. 
• Provide leadership, coaching, and direction to planners or analysts (if applicable). 
• Drive a culture of accountability, data-driven decision-making, and continuous improvement. 

Performance Measures

• Forecast Accuracy (e.g., MAPE) 
• On-Time Delivery / Customer Service Levels 
• Inventory Turns & Reduction in Excess/Obsolete Inventory 
• Schedule Adherence / Plan Attainment 
• Backlog Health & Cycle Time Improvements 
• Working Capital Optimization 
• SIOP Process Maturity and Adoption 

Qualifications & Experience

• Bachelor’s degree in supply chain, Operations, Engineering, Business, or related field (MBA or advanced degree preferred). 
• 8–12+ years of experience in supply chain, planning, or operations roles, with at least 3–5 years in SIOP leadership. 
• Experience in high-mix, low-to-medium volume manufacturing (optics, photonics, aerospace/defense, or similar preferred). 
• Proven track record of implementing or maturing SIOP processes in a complex environment. 
• Strong understanding of ERP/MRP systems (e.g., SAP, Oracle, or similar). 
• APICS/ASCM certification (CPIM, CSCP, or IBF) preferred. 

Skills & Competencies

• Strong analytical and problem-solving capability; highly data driven. 
• Ability to translate complex data into actionable insights. 
• Executive presence with strong communication and facilitation skills. 
• Proven ability to influence without authority across functions. 
• Operational credibility with understanding of manufacturing constraints and workflows.      
• Strong organizational skills with the ability to manage competing priorities. 
• Continuous improvement mindset with a bias for action. 

Personal Attributes

• Proactive and solutions-oriented; anticipates issues before they arise. 
• Comfortable operating in ambiguity and building structure where needed. 
• Collaborative and relationship-driven, with the ability to challenge constructively. 
• High accountability and ownership mindset. 

ADDITIONAL NOTES
 

This job description is not intended to be exhaustive in every respect, but rather to clearly define the fundamental purpose, responsibilities and dimensions for the role. Therefore, this job description does not describe any individual role holder. In addition to the contents of this job description, employees are expected to undertake all other reasonable and related tasks allocated by their line manager.

The Company is committed to providing equal employment opportunities for all employees and applicants for employment. The Company does not discriminate in employment opportunity or practices on the grounds of gender, race, religion or belief, age, disability, sexual orientation, gender identity, protected veteran status, or any other characteristic protected by national laws under which the Company operates.

Please note that this position will involve having access to items and technical data that may be controlled under U.S. export laws and regulations ("U.S. Export Control Laws"), including but not limited to the Export Administration Regulations ("EAR") and the International Traffic in Arms Regulations ("ITAR"). To comply with the U.S. Export Control Laws, G&H must assess whether candidates are "U.S. persons" as defined under the EAR (15 C.F.R. Part 772) and the ITAR (22 C.F.R.  § 120.15).  Certain questions asked during the application process are intended to assess this and will be used for compliance purposes only.