Associate Buyer​/Planner

Company Overview

Mainspring Energy is revolutionizing power generation with the world’s most flexible and adaptable local power generation technology, the Mainspring Linear Generator. Commercial, industrial, and utility leaders are choosing Mainspring over traditional options like engines, turbines, and fuel cells to quickly and reliably deliver local power for EV charging, commercial facilities, data centers, and grid‑scale operations. The Mainspring Linear Generator is fuel flexible, ramps up and down to meet demand, and utilizes a flameless reaction with near‑zero NOx emissions.

Backed by top‑tier investors including Khosla Ventures, Bill Gates, American Electric Power, Lightrock, and General Catalyst, Mainspring designs, manufactures and delivers its products to customers across the U.S. today, and we’re quickly scaling for international expansion. Inspired by our vision of the affordable, reliable, net‑zero carbon grid, Mainspring is rapidly expanding within the $816B global electricity equipment market, and we’re hiring the best talent to meet growing customer demand around the globe.

We welcome a broad range of backgrounds, experiences, and talents to bring fresh perspectives and ongoing innovation to our customers. More information can be found at

• Pragmatic Optimism:
  Building a new category of world‑class power generation requires optimism, ambition, and creativity, balanced with practicality to solve problems efficiently. The challenges that arise are opportunities for growth.
• Excellence without Ego:
  We bring expertise and commitment to creating the best customer experience, from sales to deployment and service, while applying deep technical rigor to building and delivering world‑class products. We strive for excellence and behave as leaders with the humility to acknowledge our challenges, both collectively and as individual contributors.
• Proactive
  
  Collaboration:
  
  The integration and cross‑disciplinary nature of Mainspring’s business requires seeking out others who bring different skills, perspectives, and priorities. Our culture of inclusion and respect extends beyond our team to interactions with our partners and customers.

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.

• At least 2 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 and 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 a similar discipline.
• Cultural fit:
  Pragmatic Optimism, Excellence without Ego, Proactive Collaboration.
• Smart, cognitively agile, high‑horsepower, dependable person.
• Clear, concise communication and presentation skills; ability to work with teams.
• Data‑driven and analytical.