Senior Manager, Supply Chain Planning

The posting, as Proper Voltage wrote it

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About Proper Voltage
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.

If you want to work on hard engineering problems that matter this is the place.

Job Overview
The Senior Manager, Supply Chain Planning builds and owns our sales and operations planning process: reconciling demand forecasts against contract manufacturers capacity, equipment throughput, and cell supply well ahead of when those constraints would otherwise surface as a shortage. This is the role that catches a capacity mismatch in a planning review, not three weeks before a build.

You also own the system that planning runs on. We are selecting an MRP now and it has to be supporting real planning before our contract manufacturers’ validation builds begin in spring 2027.

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.

This role carries three strands at once. Today you split time between building the S&OP process, standing up our MRP, and running day-to-day clear-to-build execution. Expect the planning on spreadsheets while the system comes online, because the planning cadence does not wait for the tool. 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, system ownership, and the cross-functional forecast-versus-capacity rhythm.

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. Not inherited a mature process and kept it running, built one: defined the cadence, built the first forecast and capacity model with imperfect data, and got skeptical stakeholders to actually show up and use it. You know what that looks like because you've lived it.

You have implemented or owned an MRP or ERP planning module, not just used one. You have done the unglamorous parts: item master cleanup, BOM structure, plann
[…]
ion.

• 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.

Required Qualifications

• 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.
• Hands-on experience implementing or owning an MRP or ERP planning module, including data setup and cutover, not only using one someone else configured.
• 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 standing up a planning system at a company with no IT or business systems function behind them.
• Experience working with a contract manufacturer in a component-direct sourcing model.
• Experience scaling a company through a steep production ramp.

Compensation & Benefits

• Base salary of $175,000 to $195,000, plus equity.
• Health, dental, and vision insurance.
• Flexible PTO with a generous holiday policy.
• Carlsbad, CA preferred. Open to fully remote for the right candidate. Occasional travel to contract manufacturers.

Ready to work on power systems that matter? Let's talk.