Senior Manager, Supply Chain Planning

Proper Voltage is unlocking the next generation of battery technology across robotics, data centers, and defense. We're building intelligent battery systems that make advanced chemistries (sodium-ion, lithium-titanate, lithium-silicon) work in products that were never designed for them. Humanoid robots can upgrade power systems without redesigning their entire platform. Data centers get safer, cheaper backup power. Drones and autonomous vehicles get higher energy density without lengthy integration cycles.

About the role

The Senior Manager, Supply Chain Planning builds and owns our sales and operations planning (S&OP) process: reconciling demand forecasts against contract manufacturer capacity, equipment throughput, and cell supply well ahead of when those constraints would otherwise surface as a shortage. This role reports to the Director of Supply Chain and works closely with sales, engineering, our contract manufacturers, and our cell supplier.

In the near term, this role also owns hands-on clear-to-build execution, the daily work of tracking material against the build plan, expediting suppliers, and keeping builds unblocked, while we build out the planning function. We expect this to be a two-phase role. Today, you'll split time between building the S&OP process and running day-to-day execution. As volume grows, we plan to bring in a dedicated materials execution hire to take day-to-day clear-to-build off your plate, so you can focus fully on planning, forecasting, and the cross-functional forecast-versus-capacity rhythm.

Responsibilities

• S&OP and planning: Build the initial planning cadence and tooling from scratch: a rolling demand forecast, a capacity model spanning contract manufacturer throughput, equipment constraints, and cell supply, and a recurring review cycle with defined inputs, outputs, and decision owners.
• Partner with sales and engineering to build and maintain the rolling demand forecast, and translate that forecast into a supply and capacity plan.
• Run scenario planning against demand and supply variability (acceleration, supplier slips, capacity changes) so leadership has real options in hand before being asked.
• Identify capacity or supply constraints early and drive cross-functional decisions to resolve them before they become shortages.
• Escalate constraints that can’t be resolved through the normal process, with clear options and trade-offs.
• Own long-lead cell capacity planning in partnership with our cell procurement team.
• Materials execution (near term): Own the part shortage list and drive recovery plans to closure.
• Place and manage purchase orders against forecast and production schedule; follow up directly with suppliers on committed ship dates and expedite when at risk.
• Run material readiness reviews ahead of build events with our contract manufacturers.
• Team and cross-functional leadership: Partner with our sourcing and procurement team on supplier delivery performance and long-term capacity commitments.
• Partner with supplier quality on shipments affected by a quality hold or corrective action.
• Help define and hire for a dedicated materials execution role as volume grows, and transition day-to-day execution to that role once it lands.

Requirements

• 7+ years in supply chain planning, S&OP, or demand planning in a hardware or industrial product environment.
• Direct, hands-on experience standing up an S&OP or demand-capacity planning process from scratch, not just running or maintaining one that already existed. Early-stage or resource-constrained company experience strongly preferred.
• Direct experience reconciling demand forecasts against manufacturing or supplier capacity constraints.
• Hands-on materials execution experience: purchase order management, supplier expediting, and build readiness tracking.
• Strong analytical and modeling skills; comfort building planning tools in Excel or similar without a dedicated planning system.
• Demonstrated ability to run a cross-functional process that gets engineering, sales, and leadership aligned on a shared plan.

Preferred Qualifications

• Experience in battery, energy storage, power electronics, or other hardware-adjacent categories.
• Experience planning around long-lead, high-value components such as battery cells or semiconductors.
• Experience working with a contract manufacturer in a component-direct sourcing model.
• Experience scaling a company through a steep production ramp.

Who This Role Is For

You have personally stood up an S&OP or demand-capacity planning process from scratch before, ideally at an early-stage or resource-constrained company. You know how to get engineering, sales, and leadership into the same room on a recurring basis to reconcile demand against actual capacity, not just circulate a spreadsheet nobody looks at. You are also comfortable rolling up your sleeves on hands-on execution: expediting a supplier, chasing a shipment, working a part shortage list. You think in terms of constraints—capacity at a contract manufacturer, equipment throughput, long-lead cell supply—and build your plan around real constraints rather than an idealized demand curve.

This role is not a fit for those whose experience is purely strategic planning without any hands-on execution background, purely tactical expediting without S&OP or demand-capacity planning experience, or who need a mature planning system or dedicated planning team already in place to be effective.

Benefits

• Base salary of $175,000 to $195,000, plus equity.
• Health, dental, and vision insurance.
• Flexible PTO with a generous holiday policy.

Schedule

• Carlsbad, CA preferred. Open to fully remote for the right candidate.
• Occasional travel to contract manufacturers.

Note: We are unable to provide visa sponsorship for this position.