Engineering Test Technician - Energy Storage

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 t…

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.

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

Join Redwood Materials, a pioneer in energy storage solutions, as a Mechanical Design Engineer. In this role, you will leverage your engineering expertise to design, develop, and optimize innovative mechanical systems that enhance energy storage technologies. Collaborate with a dynamic team of professionals in a fast-paced environment to drive the future of sustainable energy.

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 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....

Samsara seeks a Senior Firmware Automation Engineer based in San Francisco (SF9). This position centers on enhancing the process of developing and delivering firmware. Role overview The Senior Firmware Automation Engineer will work with teams throughout the company. The main responsibility is to design and implement automation that improves the quality of firmware releases. Collaboration Close coordination with other groups at Samsara is essential. The role requires understanding the needs of different teams and applying automation solutions that support consistent, reliable firmware delivery.

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 CalaAt Cala Health, we are dedicated to liberating individuals from the challenges posed by chronic diseases. Our journey began with the introduction of the first non-invasive prescription therapy for hand tremors. After years of meticulous refinement, we proudly launched Cala kIQ—our most advanced therapy to date. Our innovative products have enabled thousands to reclaim their lives with confidence and ease.But we are just getting started. Our groundbreaking technology holds promise across various fields including neurology and cardiology. We are committed to continuing our mission of assisting individuals in their battles against chronic diseases.The OpportunityCala Health is on the lookout for a Senior Firmware Engineer to become a key player on our expanding team. You will collaborate with a seasoned product development team, taking charge of new design, development, testing, and continually enhancing our pioneering health products.This dynamic, hands-on position demands adaptability and strong collaboration skills. You will engage with the full stack, from hardware support to application development, focusing on low-power, wearable embedded systems. If you thrive in an environment where you can wear many hats—switching between developing features for our commercial therapies, spearheading new product initiatives, and providing support to ensure timely project completion—you will excel in this role, which involves writing and executing tests, supporting compliance testing, and managing firmware documentation.The Senior Firmware Engineer will report to the Engineering Manager and will not have direct reports.Location: Hybrid (Onsite in San Mateo, CA)The compensation range for this position is competitive, with a salary range of $125,000 - $175,000, complemented by a comprehensive benefits package that aligns with our overall compensation philosophy.All applicants must be authorized to work in the United States on a full-time basis. Cala Health does not sponsor work visas.

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 Fellow as a Firmware EngineerAt Fellow, our mission is to empower coffee enthusiasts to brew exceptional coffee at home. We go beyond offering beautifully designed kettles and grinders; we are a brand immersed in innovation, community, and culture. We believe that great coffee is about the entire experience—the ritual and the connections made along the way.We are seeking a Firmware Engineer to lead the design, development, and maintenance of robust and scalable user interface (UI) and communication firmware for our Internet of Things (IoT) platform. This position is based in our San Francisco office, where you will collaborate with a talented team while being in-office four days a week.

Oura Health is seeking a Firmware Engineer to help shape the next generation of wearable technology. This hybrid role is based in either San Diego or San Francisco, California, and centers on designing and improving firmware that powers Oura’s products. Role overview As a Firmware Engineer, you will join a collaborative team focused on building and refining firmware solutions for wearable devices. The work directly impacts the user experience and overall functionality of Oura’s health-focused products. What you will do Design and implement firmware for wearable devices Optimize system performance and reliability Work closely with teammates to solve technical challenges Who will thrive This role suits someone who enjoys solving technical problems and wants to contribute to technology that supports healthier lifestyles. Curiosity and a drive to improve user experience are important for success in this position.