Senior Buyer/Planner

About Mainspring Mainspring Energy manufactures and delivers fuel-flexible, low-emissions local power solutions that rapidly add new capacity and deliver reliable, affordable, and sustainable electric power. The company began commercial shipments of its Mainspring Linear Generators in 2020 and today has hundreds of megawatts in advanced development and field operations for leading Fortune 500 companies, data centers, and utilities. Mainspring also partners with global energy leaders including AEP, NextEra Energy Resources, Schneider Electric, and more. The core values that ground our work, guide our decisions, and connect us together: Pragmatic Optimism Excellence without Ego Proactive Collaboration

Job Overview The Buyer/Planner will be managing various commodities and suppliers from “quote to pay” to ensure continuity of supply and reduce the cost of the assigned portfolio. The candidate will be organized, communicative, hands-on and will have regular shop floor engagement and constant cross-functional engagement with production, NPI, engineering, logistics, material handling, and suppliers. The role balances tactical buying excellence with advanced planning, supplier coordination, and cost control, ensuring uninterrupted supply while supporting business objectives.

Manage purchase orders, releases, and schedules to meet production and service requirements

Translate demand forecasts and MRP signals into executable supply plans that align with demand

Monitor inventory levels, lead times, MOQ compliance and capacity constraints

Ensure material availability while optimizing inventory and working capital

Serve as the primary point of contact for assigned suppliers

Communicate forecasts, schedule changes, and priorities clearly and proactively

Monitor supplier performance (OTD, quality, responsiveness)

Resolve supply disruptions and expedite when required

Deep knowledge of material planning, forecasting factoring in demand, supply, lead times, inventory, and business inputs regarding risks and use-of-capital

Deep understanding of planning systems and parameters to optimize inventory levels

Ability to provide data-driven status updates to manage exceptions

Experience administering competitive RFQs and driving supplier negotiations and supporting cost reduction activities

Ability to build and manage effective supplier relationships and act as the primary interface with suppliers on delivery status, issues, and problem resolution

Ability to communicate proactively with Production, Material Handling, and Engineers about order status and schedule challenges, and manage change orders, rush-requests, and returns, as necessary

Experience managing the transition of new products into volume production with manufacturing partners

Partner with IT and other business stakeholders on planning processes and system improvements

Experienced with cross-functional business process improvements to improve the supply chain efficiency

At least 5 years of experience in production control, material demand planning, or supply chain management environment

Independent, excellent communicator, and collaborator with Engineering, Quality, Program Management, and Manufacturing

Detail-oriented with thorough analytical capabilities including the ability to solve problems with minimal supervision

Proficient with Google Sheets and Google Workspace tools. Experience with ERP packages

Bachelor’s Degree in Engineering, Business, Economics, Supply Chain Management or similar discipline

Cultural fit: Pragmatic Optimism (creative, practical, problem solver), Excellence without Ego (expertise, rigorous, data-driven, service-oriented, leadership ability, humble), Proactive Collaboration (seeking others, inclusive, respectful)

Smart, cognitively agile, high-horsepower, dependable person

Clear, concise, to the point communication and presentation skills, ability to work with teams

Data-driven and analytical

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