Mechanical Design Engineer - Energy Storage Solutions

Redwood Materials recovers, reuses, and recycles battery materials to keep critical minerals in circulation and support the energy transition. Since 2017, the company has focused on developing large-scale, cost-effective energy storage solutions and manufacturing battery materials domestically, often using resources from existing batteries. Role overview This Functional Safety Engineer position focuses on advancing a sustainable circular economy for lithium-ion batteries. The role centers on ensuring that energy storage systems (ESS) meet functional safety standards and on supporting the secure deployment of new ESS technologies. What you will do Lead compliance efforts for ESS functional safety, with particular attention to standards such as UL 1998 (Software in Programmable Components), UL 991 (Tests for Safety-Related Controls Employing Solid-State Devices), and UL 5500 (Remote Software Updates). Support certification activities and help align product development with functional safety requirements. Location San Francisco, California, United States

About Redwood MaterialsRedwood is revolutionizing the battery supply chain by integrating recovery, reuse, and recycling, ensuring critical minerals stay in circulation while propelling the energy transition. Established in 2017, we are at the forefront of producing low-cost, large-scale energy storage solutions and manufacturing battery materials domestically for the first time, all utilizing recycled batteries.Position Overview: Functional Safety Engineer, Energy StorageAs a key player at Redwood Materials, you will be instrumental in fostering a sustainable circular economy for lithium-ion batteries. Your role will focus on transforming recycled materials into essential components for energy storage systems and next-generation battery technologies. We are looking for a dedicated and skilled Functional Safety Engineer to ensure compliance with safety standards and facilitate the safe implementation of innovative energy storage systems (ESS).Key Responsibilities:Compliance Leadership: Drive compliance initiatives for ESS functional safety with an emphasis on UL 1998 (Software in Programmable Components), UL 991 (Tests for Safety-Related Controls Utilizing Solid-State Devices), and UL 5500 (Remote Software Updates). Collaborate on certification efforts and ensure that product development aligns with functional safety standards.Risk Assessment: Conduct thorough risk assessments to identify and mitigate potential safety hazards associated with energy storage systems.Collaboration: Work closely with cross-functional teams to integrate safety considerations into the design and development processes.Documentation: Maintain comprehensive documentation of safety analyses, compliance activities, and certification processes.Continuous Improvement: Participate in ongoing improvement initiatives to enhance product safety and reliability.

We are seeking a talented and motivated Reliability Engineer to join our innovative team at Redwood Materials. In this role, you will be responsible for ensuring the reliability and performance of our cutting-edge energy storage systems. You will collaborate with cross-functional teams to develop and implement reliability engineering strategies that enhance product performance and longevity.

About Us at Redwood MaterialsAt Redwood Materials, we are revolutionizing the global battery supply chain by integrating recovery, reuse, and recycling. Founded in 2017, we are committed to keeping critical minerals in circulation and driving the energy transition. Our mission is to provide low-cost, large-scale energy storage solutions while producing battery materials in the U.S. for the first time, utilizing batteries we already have.Team ObjectivesOur team develops the software platform that enables optimized control and market participation of battery energy storage systems (BESS), with solutions operating on-site and in the cloud.Our work encompasses the entire technology stack: compute infrastructure, telemetry, asset modeling, alerting, feature ingestion and storage for forecasting and optimization, simulation, operational control orchestration, and seamless integration with energy markets.As a compact team, we uphold high standards for the quality and speed of our deliverables. We emphasize collaboration, trust, continuous learning, and engineering excellence while enjoying the process of building great solutions together.Your Role and ResponsibilitiesYou will actively contribute to our platform with potential focuses including:Data engineering for BESS — managing telemetry pipelines, feature ingestion, and storage for forecasting and optimizationSimulation and training infrastructure — developing platforms for orchestrating large-scale simulationsReal-time forecasting and optimization workflows — managing pipelines that drive BESS operationsEnergy market integration — overseeing data ingestion and bid managementSome of the technologies you will work with include Kubernetes, Rust, Python, NATS, PostgreSQL/TimescaleDB, SQLite, and more as our systems evolve.What We SeekStrong instincts for software design — you think systemically, reason from first principles, and grasp the real-world challenges of building available, reliable, scalable, and secure distributed systemsExperience with AI-accelerated development — you're comfortable leveraging AI to enhance software development processes

About Redwood MaterialsAt Redwood Materials, we are revolutionizing the battery supply chain by focusing on recovery, reuse, and recycling. Our mission is to keep essential minerals circulating and facilitate the energy transition. Since our founding in 2017, we have been at the forefront of delivering cost-effective, large-scale energy storage solutions and producing battery materials domestically—utilizing the batteries we already possess.Service Engineer, Energy StoragePosition Summary:Redwood Materials is on the lookout for a dedicated Service Engineer to become an integral part of our newly established engineering team focused on the Battery Energy Storage System (BESS) product line. In this role, you will play a crucial part in diagnosing and resolving intricate technical challenges associated with our deployed BESS. You will support the Operations and Maintenance (O&M) team by conducting routine monitoring, preventive maintenance, and first-line troubleshooting. As part of the Service Engineering team, you will act as the technical escalation resource for O&M, responsible for in-depth diagnostics, system-level failure analysis, and implementing engineering-driven corrective measures.The Service Engineer ensures the safe, reliable, and optimal performance of our assets by acting as a liaison between field operations and engineering. You will translate operational challenges into engineering solutions and provide valuable feedback from the field to enhance product and system design. This position also offers the potential for leadership growth as the team expands.The ideal candidate is self-motivated, adaptable to a dynamic startup environment, and ready to tackle both technical and leadership challenges.

Join our innovative team at Redwood Materials as a Field Quality Engineer specializing in energy storage solutions. In this pivotal role, you will be responsible for ensuring the highest quality standards in our energy storage products. Your expertise will help drive quality improvements and enhance customer satisfaction.As a Field Quality Engineer, you will work closely with our operations and engineering teams, conducting quality assessments, analyzing data, and providing actionable insights to ensure product excellence. This position offers an exciting opportunity to contribute to the advancement of sustainable energy technologies.

Join Redwood Materials as an Engineering Test Technician specializing in energy storage solutions. In this pivotal role, you will be at the forefront of testing and validating cutting-edge technologies that contribute to sustainable energy practices. You will work collaboratively with engineers and technicians to ensure the reliability and performance of our innovative energy storage systems.

About Redwood MaterialsAt Redwood Materials, we are pioneering a sustainable battery supply chain that integrates recovery, reuse, and recycling to keep essential minerals in circulation and promote the energy transition. Established in 2017, we are focused on delivering affordable, large-scale energy storage and producing battery materials domestically in the U.S., leveraging existing batteries.Senior Firmware Engineer, Energy StorageKey Responsibilities:Join an innovative engineering team at Redwood and play a vital role in designing, developing, and integrating cutting-edge products. This position emphasizes creating robust firmware from the ground up for ARM Cortex-M class microcontrollers, specifically for large-scale, distributed industrial applications. You will be responsible for communication with and control of various off-the-shelf devices, as well as developing control algorithms for power electronics.The ideal candidate is proactive, adaptable to a fast-paced startup environment, and enthusiastic about tackling new technical challenges. If you are excited to contribute to a dynamic team at Redwood, we would love to connect with you!The job level may be adjusted to match the applicant’s experience and responsibilities.

About Redwood MaterialsRedwood is pioneering a localized battery supply chain that integrates recovery, reuse, and recycling—ensuring critical minerals remain in circulation and facilitating the energy transition. Established in 2017, we are at the forefront of delivering affordable, large-scale energy storage while producing battery materials in the U.S. for the first time, utilizing batteries we already possess. The Redwood Vision: Modernizing the GridEnvision being at the forefront of a significant industrial transformation. Just as the electric vehicle revolution redefined automobiles as software-driven entities, Redwood Materials is revolutionizing the global energy grid. We go beyond merely managing batteries; we are constructing the "nervous system" for a sustainable energy economy.Our R&D team in San Francisco is spearheading the shift from outdated, hardware-centric infrastructures to agile, software-driven ecosystems. We are demonstrating that a sustainable, 100% renewable grid is not just a goal—it’s a technical reality fueled by advanced control intelligence. We seek the "architects of the electron" to help us phase out fossil-fuel peaker plants.Position: Senior Power Electronics Controls EngineerIn this role, you will spearhead the design and implementation of the intelligent control systems for our cutting-edge Battery Energy Storage Systems (BESS) and mixed-asset energy sites. You will oversee the entire lifecycle of our control systems—from initial conceptualization and advanced modeling to assessing real-world grid impacts. Your contributions will ensure that both recycled and new battery assets work in unison to stabilize the grid and maximize high-power conversion at an industrial scale.

About Redwood MaterialsAt Redwood, we are pioneering a sustainable battery supply chain that integrates recovery, reuse, and recycling, effectively keeping critical minerals in circulation and accelerating the energy transition. Established in 2017, we are committed to delivering low-cost, large-scale energy storage solutions and producing battery materials in the U.S. for the first time, all sourced from existing batteries. Power Electronics Engineer, Energy Storage Key Responsibilities:As an integral member of our product design team, you will engage in the detailed design, prototyping, and high-volume production launch of cutting-edge power converters that are efficient, cost-effective, and highly manufacturable.With expertise in high voltage (up to ~1,000 – 2,000VDC and 480VAC) and high power (~10 – 200kW) power converters, you will quantitatively assess and select topologies, control algorithms, semiconductors, and magnetics while adhering to engineering constraints such as efficiency, cost, reliability, and simplicity. Your understanding of both hard- and soft-switched topologies will be essential.

About Redwood MaterialsRedwood is on a mission to localize the global battery supply chain by seamlessly integrating recovery, reuse, and recycling, ensuring that critical minerals remain in circulation while advancing the energy transition. Established in 2017, we are pioneering low-cost, large-scale energy storage solutions and producing battery materials domestically for the first time, utilizing recycled batteries.Position: Codes and Standards Lead, Energy StorageWe are seeking a Codes and Standards Lead to represent Redwood within the regulatory and standards landscape that impacts energy storage systems. This pivotal role will be responsible for influencing how emerging technologies are regulated, permitted, and deployed, while fostering safe, scalable innovation in a dynamic industry. This senior-level technical position demands strong thought leadership at the convergence of engineering, compliance, policy, and industry advocacy. Key Responsibilities Include:Develop and advocate for industry codes and standards that facilitate regulatory compliance.Collaborate with cross-functional teams to ensure alignment on compliance issues.Engage with regulatory bodies and industry associations to represent Redwood's interests.

About Redwood MaterialsAt Redwood Materials, we are on a mission to localize the global battery supply chain by integrating recovery, reuse, and recycling. Founded in 2017, we are pioneering the delivery of low-cost, large-scale energy storage solutions and producing battery materials in the U.S. for the first time, all sourced from existing batteries.Role Overview:As an integral member of the Redwood Energy engineering team, you will play a hands-on role in the design, development, and integration of innovative second-life battery-based energy storage systems. This position focuses on creating robust and reliable system software for the Site Controller, which acts as the central nervous system for our products. You will be responsible for designing and implementing containerized services for networked device management, orchestrating site-level controls, managing time series data, and conducting system diagnostics.We are looking for highly motivated candidates who are adaptable to a fast-paced startup environment and eager to tackle exciting technical challenges. If you thrive in dynamic settings and are excited about contributing to a new department at Redwood, we encourage you to apply!The job level may be adjusted based on the applicant's experience and responsibilities.

About Redwood MaterialsRedwood Materials is pioneering a sustainable battery supply chain that integrates recovery, reuse, and recycling—enabling the circulation of critical minerals and facilitating the energy transition. Established in 2017, we are proud to offer low-cost, large-scale energy storage solutions and produce battery materials within the U.S. for the first time, utilizing batteries that are already in circulation.Modeling and Architecture Engineer, Energy StorageAs the technical lead of the Energy Storage Modeling and Architecture team, you will play a critical role in the design, development, and integration of Redwood Energy’s innovative second-life battery product. You will serve as the subject matter expert in creating a multiphysics and technoeconomic modeling platform that informs the system design of this cutting-edge battery energy storage solution. These models must be robust enough to accurately size future projects while remaining agile enough to facilitate a wide range of design decisions.Additionally, you will be tasked with operationalizing these insights into an algorithm that optimally manages the use of each battery pack on our premises, maximizing the value extracted before recycling. This model will dictate operational parameters, including state of charge (SOC) windows and charge/discharge powers, along with decisions regarding when to replace a pack and what to use as a replacement.The ideal candidate will be self-motivated, adaptable to a startup culture, and enthusiastic about tackling novel technical challenges. You should possess experience in leading modeling teams within the battery energy storage or electric vehicle sectors while being a first-principles thinker capable of initiating new modeling projects independently.

About Redwood MaterialsRedwood is revolutionizing the global battery supply chain through the integration of recovery, reuse, and recycling—ensuring vital minerals remain in circulation while propelling the energy transition. Established in 2017, we are pioneering the production of low-cost, large-scale energy storage solutions and manufacturing battery materials in the U.S. from existing batteries.Position Overview: Manufacturing Test Infrastructure Lead EngineerAs a foundational member of our new engineering team, you will be instrumental in designing testing systems that will support the development of groundbreaking products at Redwood Materials. Your role will encompass aspects of mechanical, electrical, and software engineering to ensure thorough product validation. You will design testing systems applicable in both manufacturing and field environments to screen our innovative products. This role demands a hands-on, proactive mindset combined with a methodical and analytical approach to problem-solving.Key Responsibilities:Lead the comprehensive development of functional and end-of-line testers for electromechanical products....

About Redwood MaterialsRedwood is pioneering the localization of a global battery supply chain that integrates recovery, reuse, and recycling, ensuring critical minerals remain in circulation and propelling the energy transition forward. Founded in 2017, we are committed to delivering cost-effective and large-scale energy storage solutions and producing battery materials in the U.S. for the first time, utilizing batteries already in circulation.Join us as a Systems Engineer, Energy Storage!As an early member of our new engineering team, you will play a pivotal role in the design, development, and integration of innovative products at Redwood. You will spearhead our system engineering initiatives, fostering collaboration among our mechanical, electrical, and software engineering teams to deliver a cohesive and effective system. Your responsibilities will include defining clear requirements, evaluating and selecting system architectures, and guiding critical decisions across the engineering organization. If you are a proponent of model-driven design and can adapt engineering frameworks to suit a dynamic and fast-paced environment, we want to hear from you!The ideal candidate is highly self-motivated, adaptable to the startup culture, and eager to tackle unique technical challenges. If you thrive in a vibrant, fast-moving setting and are excited about being part of a new team at Redwood, we encourage you to apply!If necessary, the job level will be adjusted to align with the applicant’s experience and responsibilities.

About Redwood MaterialsAt Redwood, we are revolutionizing the global battery supply chain by integrating recovery, reuse, and recycling—ensuring critical minerals remain in circulation and accelerating the energy transition. Established in 2017, we are pioneering low-cost, large-scale energy storage solutions and producing battery materials domestically in the U.S. for the first time, all sourced from existing batteries.Position: Power Systems Engineer - Energy StorageKey Responsibilities:Collaborate with product and controls design teams to translate power system requirements into specifications for site and inverter controllers, thereby influencing control architecture at both system and plant levels.Engage in the design and optimization of power systems for energy storage applications, ensuring efficiency and reliability.Analyze and improve existing power systems, focusing on performance and scalability.

About Redwood MaterialsRedwood Materials is revolutionizing the global battery supply chain by integrating recovery, reuse, and recycling to keep essential minerals in circulation and facilitate the energy transition. Established in 2017, we are pioneering low-cost, large-scale energy storage solutions and manufacturing battery materials domestically for the first time, utilizing existing batteries.Role OverviewWe are in search of a Hardware Technical Program Manager (TPM) to spearhead the development, testing, and manufacturing of sophisticated box-level electronic assemblies. You will be responsible for program execution from concept through production, ensuring seamless coordination across hardware engineering, validation, supply chain, and operations. This role focuses on guaranteeing that our hardware — including circuit boards, flex assemblies, enclosures, connectors, and integrated box builds — meets reliability standards, undergoes rigorous testing, and is scalable for production.

Join Redwood Materials!At Redwood, we are pioneering a sustainable battery supply chain that emphasizes recovery, reuse, and recycling. Our mission is to keep critical minerals in circulation while driving the energy transition. Founded in 2017, we are proud to be delivering low-cost, large-scale energy storage solutions and producing battery materials in the U.S. for the first time, utilizing batteries we already have.Position Overview: Staff Finance Associate, Energy StorageWe are seeking a talented and motivated Staff Finance Associate to become an integral part of our Energy Storage team in San Francisco. In this pivotal role, you will serve as the financial backbone for our supply chain and product cost operations, ensuring BOM transparency, optimizing costs, and maintaining financial rigor throughout our energy storage business. You will be responsible for comprehensive BOM cost management and spearheading cost reduction initiatives across the supply chain.Key Responsibilities:Manage and uphold detailed bill of materials cost models for all energy storage products, ensuring accuracy, version control, and organizational visibility.Develop and oversee should-cost models to benchmark component and subassembly pricing against market rates and supplier quotes.Collaborate with engineering, procurement, and operations to identify, quantify, and track cost reduction initiatives, including supplier negotiations and design-to-value opportunities.Analyze supplier cost structures and logistics economics to inform sourcing strategies and mitigate risks.

Join Redwood Materials as a Business Operations Analyst for Energy Storage!At Redwood, we are pioneering a sustainable battery supply chain that focuses on recovery, reuse, and recycling, all while enhancing the energy transition. Established in 2017, we are at the forefront of providing cost-effective, large-scale energy storage solutions and producing battery materials domestically for the first time, utilizing the batteries we already possess.As a Business Operations Analyst specializing in Energy Storage, you will be a key player in driving the commercial expansion of our utility-scale battery energy storage initiatives. Your role will involve providing operational support to our sales team, leveraging data to inform decision-making, streamlining sales processes, and fostering collaboration across different teams to enhance our market presence.