SIOP Senior Manager

About the role

We are building a formal Sales, Inventory & Operations Planning (SIOP) process from the ground up. This is a founding build role, not a maintenance role. Reporting to the VP of SIOP and Product Line Sales, you will operationalize the process by standing up the cadence, tools, data, and meeting mechanics, and keeping it running with discipline once live. You'll partner closely with Sales, Finance, Marketing, Operations, and Supply Chain to align demand and supply plans. Ideal for someone who has seen SIOP done well elsewhere and wants to build the operating engine here—comfortable with ambiguity, cross-functional coordination, and making a new process stick in an organization that hasn’t run one before.

Responsibilities

• Process Design & Implementation
  • Partner with the VP to translate the SIOP vision and governance model into an operating process (demand review, supply review, pre-SIOP) tailored to our business, products, and org structure.
  • Own the operational build-out of the monthly cadence, meeting mechanics, inputs/outputs, and pre-read materials for each step of the process.
  • Build and maintain KPI dashboards and scorecards (forecast accuracy, bias, service level, inventory turns, etc.) to report process health to executive leadership.
  • Build the toolset needed to support the process (Excel/BI-based initially, with a roadmap toward planning software if applicable).
• Sales & Operations Execution (S&OE) Oversight
  • Oversee the weekly S&OE cadence that bridges the monthly SIOP plan to day-to-day execution, closing the gap between planned and actual demand/supply.
  • Monitor near-term demand signals (order intake, shipments, customer changes) and supply signals (production attainment, material availability, backlog) against the SIOP plan.
  • Identify and drive resolution of short-term exceptions (e.g., missed production runs, unexpected order spikes) before they cascade into the next SIOP cycle.
  • Coordinate with Operations, Planning, and Customer Service to reconcile in-period shifts and keep execution aligned to plan.
  • Feed execution-level insights and recurring exception patterns back into monthly demand/supply reviews to improve plan quality.
• Demand Planning
  • Own the statistical and collaborative demand forecast at the appropriate level (SKU/family/customer) on a rolling horizon.
  • Facilitate consensus demand reviews with Sales and Marketing to incorporate market intelligence, promotions, and new product launches.
  • Track and report forecast accuracy/bias and drive continuous improvement in forecasting methods.
• Cross-Functional Facilitation
  • Own agenda setting, pre-reads, and facilitation for monthly demand review, supply review, pre-SIOP, and Exec SIOP meetings.
  • Prepare analysis, data, and pre-SIOP package for executive SIOP meetings.
  • Serve as the day-to-day connective tissue between Sales, Finance, Marketing, Operations, and Supply Chain to ensure one aligned number flows through the business.
  • Identify and frame demand/supply trade-offs and imbalances, elevating them to the VP for resolution or executive escalation.
• Team & Collaboration
  • Operate as an individual contributor initially; may guide or coordinate junior demand planners/analysts as the SIOP team scales.
• Change Management & Adoption
  • Build buy-in for the process across functions new to SIOP discipline.
  • Train and coach stakeholders on their role in the process and how to prepare for/participate in reviews.
  • Iterate on the process based on feedback and maturity—own continuous improvement, not just initial rollout.
• Reporting & Governance
  • Maintain the SIOP calendar, documentation, and meeting governance.
  • Provide the VP with visibility into demand/supply gaps, risks, and opportunities ahead of executive review.
  • Partner with Finance to reconcile the operating plan with the financial plan (integrated business planning mindset).

Requirements

• Required Qualifications
  • 7+ years of experience in demand planning, supply planning, S&OP/SIOP, or integrated business planning.
  • Demonstrated experience either building a SIOP/S&OP process from scratch or significantly maturing one.
  • Strong facilitation skills—able to run cross-functional meetings with senior stakeholders and drive decisions.
  • Advanced Excel/analytics skills; comfort working with ERP and forecasting/BI tools.
  • Strong communication skills, including presenting to executive leadership.
  • Ability to operate with ambiguity and build structure where none currently exists.
• Preferred Experience
  • Formal planning software (e.g., Kinaxis, o9, SAP IBP, Anaplan, Blue Yonder).
  • Role reporting into or partnering closely with Finance (IBP experience).
  • Multi-site manufacturing environment strongly preferred.
  • Marine, automotive, or powersports industry.

Skills

• Builder mentality—energized by creating something new rather than optimizing something established.
• High EQ and political savvy to align stakeholders with competing priorities.
• Data-driven but pragmatic—knows when "good enough" data can move the process forward.
• Persistent and process-disciplined; won’t let the cadence slip once established.

Work Environment

Typical 8-hour workdays with frequent interaction in production and operational settings. Regional travel as required. Extended hours may be necessary based on business needs. Appropriate PPE is required when entering production environments.