Hardware Systems Engineer at Lumafield | San Francisco

Lumafield develops X-Ray CT scanners designed to make advanced imaging more accessible and affordable. The company’s cloud software provides engineers with detailed visualization tools, helping them analyze complex products and make informed decisions. Role overview This full-time, on-site Hardware Systems Engineer position is based in San Francisco. The role centers on leading hardware development for industrial CT scanners. Collaboration with researchers and designers is a key part of the job, with a focus on improving product development for a range of industries. What you will do Lead hardware systems development for industrial CT scanners Design and manage electrical architecture Develop firmware and oversee system integration Work hands-on to transform concepts into working products Collaborate with cross-functional teams to address customer needs Team and collaboration The engineering team includes experienced researchers and designers who value curiosity and rigor. The group is impact-driven and backed by leading venture capital firms. Location This role requires working on-site at Lumafield’s San Francisco office.

About Lumafield:Founded in 2019, Lumafield is on a mission to transform the landscape of manufacturing. Our team of seasoned engineers brings extensive expertise across the product development cycle, addressing the frustrations associated with the high costs and complexities of modern manufacturing. We aim to enhance this process.Engineers make crucial, multi-million dollar decisions daily, and require tools that provide unparalleled insight into their products. Lumafield offers exceptional visibility and AI-driven tools that not only pinpoint issues but also generate valuable quantitative data, poised to revolutionize the creation, manufacturing, and utilization of complex products across various sectors. Our journey started with industrial CT scanning, an underutilized yet invaluable tool that facilitates rapid, non-destructive inspection of essential components.We have reengineered the entire system, from X-ray capture and computer vision analysis to web-based collaboration and overall business model, making cutting-edge manufacturing technology accessible to all industries. Our company, much like our platform, is designed for continuous improvement. We are committed to fostering greater intelligence, autonomy, and speed, striving for operational excellence and insightful analytics. And we will continue to evolve.About the Role: As a Customer Success Manager (CSM) at Lumafield, you will be integral in partnering with our customers, advocating for their needs within our organization, and managing accounts to drive business outcomes and revenue growth.You will oversee the customer lifecycle, from post-sale onboarding to renewals and expansions, acting as a trusted advisor for stakeholders, fostering advocacy within accounts, and ensuring customers derive significant value from our products.Operating at the intersection of advanced industrial technology and customer strategy, you will lead business reviews, develop and implement mutual success plans, and enhance net revenue retention through strategic account growth.This role requires not only technical expertise in engineering analysis but also the business acumen to translate technical achievements into tangible business value, facilitating discussions with executive stakeholders within customer organizations.

At Crusoe, our mission is to propel the availability of energy and intelligence. We are designing the engine that fuels a future where individuals can ambitiously innovate with AI, all while upholding standards of scale, speed, and sustainability.Join us in the AI revolution powered by sustainable technology at Crusoe. Here, you will spearhead significant innovations, make a lasting impact, and collaborate with a team that is leading the charge in responsible, transformative cloud infrastructure.About This Role:We are on the lookout for a Hardware Production / Sustaining Engineer to enhance Crusoe’s Hardware Systems Engineering team and address critical skill gaps in debugging, validation, and production support of high-performance computing systems. In this role, you will oversee the entire hardware lifecycle—from prototype initiation to mass production—while driving automation, resolving intricate issues, and ensuring reliability across Crusoe Cloud’s GPU- and CPU-based infrastructure.You will collaborate closely with cross-functional teams to support, debug, and optimize hardware platforms at scale, with a specific focus on PCIe, InfiniBand, and NVMe/storage, which are recognized as vital areas for enhanced expertise. Your contributions will significantly influence Crusoe’s capability to deploy and manage sustainable, AI-first computing systems that deliver world-class performance and reliability.What You’ll Be Working On:Lead the entire hardware development and sustaining lifecycle, encompassing feasibility, bring-up, validation, deployment, and ongoing production support.Create and maintain scripting and automation frameworks for hardware testing, diagnostics, and continuous reliability enhancements.Guide deep troubleshooting and debugging across:PCIe (link training, topology, performance issues)InfiniBand (fabric debugging, throughput, connectivity issues)NVMe/storage (performance bottlenecks, firmware interactions, failure analysis)Perform thorough system validation and characterization for GPU, CPU, and high-performance computing platforms.Assist in end-to-end integration and solution testing to guarantee that Crusoe Cloud products fulfill performance, reliability, and scalability standards.Work in tandem with mechanical, thermal, firmware, software, and manufacturing teams to resolve system-level challenges.

At Crusoe, our mission is to drive the evolution of energy and intelligence. We are developing the technology that fuels a future where individuals can ambitiously harness AI capabilities without compromising on scale, speed, or sustainability.Join us in revolutionizing AI with sustainable solutions at Crusoe. In this role, you will be at the forefront of innovation, making a significant impact while collaborating with a team that is shaping the future of responsible and transformative cloud infrastructure.About This Role:We are looking for a dedicated Hardware Production/Sustaining Engineer to enhance Crusoe's Hardware Systems Engineering team. This position is critical for bridging essential skill gaps in debugging, validation, and production support for high-performance computing systems. You will manage the entire hardware lifecycle—from prototype initiation to large-scale production—focusing on automation, deep troubleshooting, and reliability within Crusoe Cloud’s GPU- and CPU-oriented infrastructure.Your collaboration with cross-functional teams will be vital in supporting, debugging, and enhancing hardware platforms on a large scale, specifically targeting PCIe, InfiniBand, and NVMe/storage, which have been highlighted as key areas for expanded expertise. Your contributions will directly influence Crusoe’s capability to deploy and maintain sustainable, AI-driven computing systems that deliver exceptional performance and reliability.Your Responsibilities Will Include:Leading the complete hardware development and sustaining lifecycle, encompassing feasibility studies, bring-up, validation, deployment, and ongoing production support.Creating and sustaining automation frameworks and scripts for hardware testing, diagnostics, and continual reliability enhancements.Executing in-depth troubleshooting and debugging across:PCIe (including link training, topology, and performance issues)InfiniBand (focusing on fabric debugging, throughput, and connectivity challenges)NVMe/storage (addressing performance bottlenecks, firmware interactions, and failure analyses)Performing extensive system validation and characterization for GPU, CPU, and high-performance computing platforms.Assisting in end-to-end integration and solution testing to guarantee that Crusoe Cloud products fulfill performance, reliability, and scalability standards.Collaborating with teams across mechanical, thermal, firmware, software, and manufacturing domains to troubleshoot and enhance system performance.

About Lumafield: Established in 2019, Lumafield has pioneered the development of the world's first accessible X-Ray CT scanner specifically designed for engineers. Our intuitive scanner, combined with cloud-based software, empowers engineers to gain unparalleled insights into their projects at a remarkably affordable cost. Engineers face high-stakes decisions daily, necessitating tools that provide maximum visibility into their designs. By delivering exceptional product clarity and AI-enhanced tools that identify issues and produce quantitative insights, Lumafield is set to transform the creation, manufacturing, and application of complex products across various sectors. Our company thrives on impact and is dedicated to delivering the utmost value to our customers, ensuring their needs drive our development. Our talented team consists of leading researchers, industrial designers, PhD holders, innovators, and startup founders, all working collaboratively without egos. We proudly receive backing from prestigious venture capital firms, including Kleiner Perkins, Lux Capital, DCVC, and Spark Capital.Headquartered in Cambridge, MA, with an additional office in San Francisco, CA, we are excited to grow our team.About the Role: As a Senior Systems Software Engineer at Lumafield, you will be instrumental in developing the software that drives our cutting-edge, in-line manufacturing CT scanning products. You will engage with state-of-the-art X-ray physics, high-speed detectors, image processing, and embedded systems. Collaborating within a small team focused on our latest hardware, you will harness your expertise to maximize system performance and achieve outstanding results for our clients. This position is perfect for those eager to take ownership of embedded systems, firmware, and software design in an early-stage product environment. This role is based in our San Francisco, CA office, with occasional travel required to our Cambridge, MA office.

About Our TeamAt OpenAI, our Hardware team specializes in developing cutting-edge silicon and system-level solutions tailored to meet the rigorous demands of advanced AI applications. We are at the forefront of creating the next generation of AI-native silicon and collaborate closely with our software and research partners to ensure our hardware is seamlessly integrated with AI models. Our mission extends beyond just delivering production-grade silicon for OpenAI’s supercomputing infrastructure; we are also dedicated to innovating custom design tools and methodologies that enhance hardware optimized for AI.About the PositionWe are seeking a highly skilled Mechanical Engineer with a minimum of 7 years of experience in the design of IT hardware, encompassing everything from chip/package to system levels. In this role, you will collaborate with a team of experts across thermal, mechanical, electrical, software, and systems engineering to support the design, analysis, and validation of mechanical and thermal systems that guarantee the reliability, efficiency, and longevity of critical hardware. A strong analytical mindset, hands-on testing experience, and the ability to thrive in a fast-paced, multidisciplinary environment are essential for success in this role.This position is based in San Francisco, CA, and follows a hybrid work model, requiring 3 days in the office per week. We also offer relocation assistance for new hires.Key ResponsibilitiesLead mechanical designs for AI supercomputer products within data center applications.Collaborate with cross-functional teams to design and enhance thermal solutions for data center hardware, including chips, power modules, and system-level cooling architectures.Integrate thermal management strategies into hardware designs from concept through to mass production.Design and validate mechanical systems such as chassis, enclosures, and cooling systems while ensuring compliance with performance and reliability standards.Conduct 3D modeling, finite element analysis (FEA), tolerance analysis, and prototyping to ensure manufacturability and adherence to stringent quality requirements.Perform mechanical testing, including vibration, shock, and thermal cycling, to ensure long-term reliability under extreme operating conditions.Identify and assess new technologies and methodologies to enhance mechanical and thermal performance in product designs, contributing expertise in mechanical design to new product development initiatives.

Join Our Innovative TeamLumafield is seeking a skilled Quality Assurance (QA) Test Engineer to play a pivotal role in ensuring the excellence and dependability of our advanced, cloud-based web application, Voyager. In this hands-on position, you will be responsible for implementing and refining our QA strategy, seamlessly integrating manual exploratory testing with robust automation testing to provide our users with a flawless, high-quality experience in industrial inspection.

About Lumafield: Founded in 2019, Lumafield is on a mission to transform the manufacturing landscape. Our team comprises seasoned engineers with extensive experience across the entire product development cycle, from conceptualization to hardware delivery. Frustrated by the prohibitive costs and complexities of contemporary manufacturing, we set out to enhance it.Engineers make critical decisions daily, and they require tools that provide them with profound insights into their products. By delivering unparalleled visibility and AI-driven tools that identify issues and produce quantitative data, Lumafield aims to revolutionize how complex products are designed, manufactured, and utilized across various sectors. We began with industrial CT scanning — a powerful yet underutilized tool that enables rapid, non-destructive inspection of vital components.We have reengineered the entire system—from X-ray capture to computer vision analysis and web-based collaboration—making advanced manufacturing technology more accessible to all industries. Our company, much like our platform, is designed for continuous upgrades. We are committed to fostering greater intelligence, autonomy, and efficiency, providing deeper insights, operational excellence, and impactful intelligence. And we will continue to innovate.About the Role: Lumafield is seeking a Customer Success Manager (CSM) to collaborate closely with our clients, advocate for their needs internally, and manage accounts to drive business outcomes and revenue growth. The CSM will oversee the entire customer lifecycle, from post-sale onboarding to renewals and expansions, acting as a trusted advisor for stakeholders. Your role will involve fostering advocacy within client accounts and ensuring that customers derive significant business value from our solutions. Operating at the crossroads of cutting-edge industrial technology and customer strategy, CSMs will conduct business reviews, develop and implement joint customer success plans, and enhance net revenue retention through strategic account growth.This position requires technical proficiency to comprehend engineering analyses, alongside business acumen to convert technical success into tangible business value while engaging in discussions with executive stakeholders at client organizations.

Role overview The Hardware Program Manager at meter leads complex hardware initiatives from initial planning through final delivery. This position ensures each project phase aligns with company objectives and remains on schedule. The role is based in San Francisco. What you will do Work closely with teams across disciplines to guide hardware products from concept to launch Manage project plans, set timelines, and track deliverables Monitor project progress and make adjustments to keep deadlines on track Contribute to the development of hardware solutions that enhance meter’s product offerings Location This role requires working onsite in San Francisco.

Who We AreSamsara (NYSE: IOT) is a trailblazer in the Connected Operations™ Cloud, a platform that empowers organizations reliant on physical operations to leverage Internet of Things (IoT) data for actionable insights and operational improvements. Our mission at Samsara is to enhance the safety, efficiency, and sustainability of the physical operations that underpin the global economy. Covering over 40% of global GDP, these sectors include agriculture, construction, field services, transportation, and manufacturing. We are dedicated to digitally transforming their operations on a large scale.Joining Samsara means you'll be part of a team that's defining the future of physical operations. You will contribute to a dynamic range of product solutions, including Video-Based Safety, Vehicle Telematics, Apps and Driver Workflows, and Equipment Monitoring. As a company that has recently gone public, you will enjoy the autonomy and support to make a significant impact as we build for the future.About the Role:Samsara's Hardware Reliability team plays a crucial role in ensuring an outstanding customer experience through reliable hardware. As a Senior Hardware Reliability Engineer, you will establish quality processes that uphold the high standards of Samsara's hardware.In this role, you will implement and execute comprehensive reliability strategies that cover the entire product development lifecycle, from concept to warranty repair. You will rapidly gather and analyze test, field performance, and manufacturing data to drive necessary actions both internally and with our suppliers, ensuring the production of top-quality products. Collaboration with hardware, firmware, and operations teams is a fundamental aspect of this role.This is a hybrid position open to candidates residing in the US, requiring you to visit our office in San Francisco three times a week.You Should Apply If:You want to impact the industries that run our world: Your efforts will lead to tangible real-world benefits—helping to maintain essential services and support vital industries.

Company OverviewEcho Neurotechnologies is an innovative startup at the forefront of Brain-Computer Interface (BCI) technology. We are committed to creating advanced hardware solutions powered by AI, aimed at restoring autonomy for individuals with disabilities and enhancing their quality of life.Team CultureBecome a part of our dynamic team of passionate and skilled professionals. We thrive in a collaborative environment, where you will have the opportunity to take charge of pivotal decisions that shape our future. We prioritize continuous learning and development, encouraging contributions that drive our collective success.Position SummaryWe are looking for a Senior Hardware Engineer with expertise in Mechanical Engineering to validate our cutting-edge Echo hardware systems. You will evaluate custom hardware devices and subsystems, while also spearheading the development and execution of specialized test systems for design verification.Key ResponsibilitiesDesign and prototype mechanical components and assemblies, including rapid prototyping, machining, and injection molding.Develop electromechanical test systems to characterize and assess hardware devices.Create test protocols, implement design verification testing, and manage vendor testing processes.Analyze test data, produce technical reports, and supervise vendor test reports.Generate component and assembly drawings, including tolerance stack-ups and analyses.Plan and conduct design verification activities.QualificationsBachelor's degree in Mechanical Engineering or a related field.A minimum of 7 years of professional experience in engineering electro-mechanical hardware devices.Proficient in hands-on machining and rapid prototyping techniques.Experience in data analysis from physical systems.Familiarity with quality systems and standards.Preferred QualificationsMaster’s degree in Mechanical Engineering or a related field.Strong analytical skills and attention to detail.Ability to work collaboratively in a fast-paced environment.

Join linqapp as a Systems Engineer and be a pivotal part of our innovative team in the heart of San Francisco. In this role, you will design, implement, and maintain systems that enhance our product offerings and drive efficiency. We are looking for a passionate engineer who thrives in a collaborative environment and is dedicated to delivering high-quality solutions.

Dapster is actively seeking a Lead Hardware Engineer to become a pivotal part of our dynamic team. As a rapidly growing startup, this position offers the unique opportunity to influence our foundational technologies and products.About Dapster: We are dedicated to revolutionizing the market with AI-driven robotic picking solutions. Recently, we secured a significant pilot project with a top retailer, providing us with dilution-free funding to further develop our core technology.If you're eager to engage in innovative work alongside a talented and humble team, and want to share in the rewards of joining us at such an early stage, we’d love to hear from you!

Company Overview:Specter is revolutionizing how businesses perceive their physical environments by developing a software-defined control plane. Our mission is to enhance the security of American enterprises by providing them with comprehensive visibility over their physical assets.We are pioneering a connected hardware-software ecosystem that leverages multi-modal wireless mesh sensing technology, reducing the deployment costs and time for sensors by a factor of ten. Our platform aims to be the perception engine for a company’s physical presence, facilitating real-time visibility of perimeters and enabling autonomous operational management.Founded by passionate innovators from Anduril, Tesla, Uber, and the U.S. Special Forces, our co-founders, Xerxes and Philip, are dedicated to empowering our partners in the rapidly evolving landscape of physical AI and robotics.

About the TeamThe Scaling team at OpenAI forms the architectural and engineering foundation of our infrastructure. We innovate and implement advanced systems that facilitate the deployment and operation of next-generation AI models. Our responsibilities encompass system software, networking, platform architecture, fleet-level monitoring, and performance enhancement.About the RoleWe are seeking a skilled software engineer proficient in transforming early-stage, sometimes chaotic, pre-production hardware into stable, operational systems. You will be pivotal in bootstrapping, imaging, integrating with the Kubernetes control plane, and ensuring observability. Your role will bridge early hardware bring-up, provisioning automation, fleet and cluster management, and integration with lab or cloud services—effectively converting new SKUs into usable capacity for our internal stakeholders.Key ResponsibilitiesManage the comprehensive bring-up and bootstrapping process for new systems and compute nodes, transitioning from bare metal or early access in lab or production/cloud settings to schedulable fleet capacity, including image building, user-data/configuration, cluster joining, and readiness gates.Develop and uphold top-tier golden image and provisioning workflows across lab and production environments, collaborating with partner-provided base images while ensuring OS/version compatibility.Collaborate with partner teams to integrate nodes into our fleet infrastructure and Infrastructure as Code (IaC) pipelines (Terraform, Chef, etc.), guaranteeing that cloud resources align seamlessly with our internal lifecycle expectations.Work closely with scheduling and platform owners to ensure new hardware is accessible and properly scheduled, addressing pool definitions, network connectivity, routing, admission controls, and platform-specific requirements.Ensure registration and inventory accuracy, providing hands-on support to track nodes and their metadata from end to end.Partner with teams to establish baseline health and telemetry monitoring for bring-up, including critical health signals, pass/fail assessments, and automated reporting for initial ramp decisions.Troubleshoot issues across various layers, including PXE/boot-loader, UEFI/BIOS, BMC, OS bring-up, NIC/network accessibility, kubelet/control-plane connectivity, storage limitations, and early lab/rack scenarios.

Impulse, based in San Francisco, brings together engineers, designers, and innovators to build high-performance products for whole-home electrification. The team focuses on making sustainable home choices both practical and attractive, aiming for solutions that last without compromise. Role overview The Hardware System Technical Program Manager guides complex hardware systems from initial concept through production and launch. This role sits at the center of the hardware product lifecycle, ensuring seamless integration of systems into Impulse’s products. What you will do Lead cross-functional teams, including Mechanical, Electrical, and Firmware Engineers, through every stage of hardware development Coordinate efforts with Product Management, Finance, Tech Operations, Marketing, and company leadership Drive hardware program execution, keeping projects aligned with business objectives and timelines Manage collaboration with joint development partners and internal stakeholders Location This position is based in San Francisco.

About Lumafield: Founded in 2019, Lumafield is at the forefront of modernizing manufacturing processes. Our team of seasoned engineers, with expertise spanning the entire product development cycle, identified the challenges posed by the intricate and costly nature of contemporary manufacturing. In response, we are committed to transforming this landscape.Engineers make critical decisions daily, and they require tools that provide comprehensive insights into their products. Lumafield delivers unparalleled visibility into product development through AI-driven solutions that pinpoint issues and yield quantitative data. Our innovative approach promises to redefine the creation, manufacturing, and application of complex products across various sectors. We have pioneered the use of industrial CT scanning—a crucial yet underutilized tool that allows for rapid, non-destructive inspection of vital components.By reengineering the entire system—from X-ray capture and computer vision analysis to web-based collaboration—we're making cutting-edge manufacturing technology accessible across all industries. Our mission is to continuously enhance intelligence, autonomy, and speed, paving the way for operational excellence and profound insights. And then we'll take it to the next level.About the Role: In the role of Chief Information Security Officer (CISO), you will take charge of Lumafield's security operations, overseeing everything from cloud infrastructure and product security to safeguarding customer data and ensuring regulatory compliance. This is a unique opportunity to shape the security culture and framework of a rapidly growing company that handles some of the most sensitive intellectual property globally, including proprietary product designs and internal manufacturing processes.Your position will report directly to the CEO and involve close collaboration with Engineering, Product, Operations, and Sales teams to ensure that security measures facilitate rather than hinder business operations.

About Flow EngineeringFlow Engineering is pioneering the future of hardware systems development. Our mission is to transform how humanity designs and builds its most essential machines.Supported by Sequoia Capital and notable angel investors like Patrick & John Collison (Stripe), David Helgason (Unity), and Kyle Parrish (Figma), we are at the forefront of innovation.Flow is the leading requirements tool in complex systems engineering, utilized by advanced sectors such as space exploration, defense, automotive, and robotics. Our contributions will be pivotal as humanity ventures back to the Moon, harnesses fusion energy, or establishes the first interplanetary colony. Why Join Us?At Flow, we seek individuals who challenge the status quo, innovate fearlessly, and tackle complex problems, even if no specific role is currently available. If our mission resonates with you and you envision a way to contribute meaningfully, we would be eager to connect.You will have the opportunity to shape your own career journey within a dynamic, rapidly expanding environment. If there is a strong match, we will collaborate to define a role that aligns with your talents and our strategic needs.Please send us your resume along with a brief note highlighting your strengths and proudest achievements. Our ValuesSpeed is our Superpower: We believe that urgency in our work is essential. This discipline empowers us to achieve remarkable results.Own, Downscope, Ship, Iterate: We embrace rapid cycles of development, focusing on delivering a minimum viable product quickly and learning from user feedback. Success comes from our commitment to execution.Master the Fundamentals: Success stems from mastering the basics while prioritizing simplicity and clear communication.Disagree and Commit: We encourage robust discussions and quick decision-making to maintain our momentum.Enjoy the Journey: We believe in celebrating the growth and challenges we encounter along the way.

About the RoleHinge Health is on the lookout for a talented Electrical Engineer to become a vital member of our Hardware Engineering team. This is an exciting opportunity to contribute to the design and development of our cutting-edge hardware products that are revolutionizing healthcare.In this junior-to-mid-level position, you will engage in a variety of projects, taking charge of board-level designs for highly integrated medical devices, guiding them through the entire process from schematic creation to layout and assembly. Collaboration is key; you will partner with firmware, mechanical, and manufacturing teams to transform concepts into market-ready products.We are seeking an enthusiastic candidate who is passionate about harnessing hardware solutions to tackle real-world problems. Your contributions will directly influence the quality of life for our millions of members. As a part of our dedicated Hardware group within the broader R&D organization, you will join a small, motivated team where your ideas and input are truly valued.

About braintrustBraintrust is at the forefront of AI observability. By merging evaluation and observability into a singular workflow, we empower developers with the insights needed to comprehend AI behavior in production environments, along with the tools to enhance it.Leading teams at Notion, Stripe, Zapier, Vercel, and Ramp utilize Braintrust to compare models, test prompts, and monitor regressions — transforming production data into superior AI with each new release.About the roleWe are in search of a passionate software engineer dedicated to crafting high-performance data processing systems. Our clientele consists of large enterprises handling complex, semi-structured data, which they require for real-time processing and analysis. Our distinct architecture enables these organizations to keep data on-premises while creating intricate visualizations that load without delay. Explore our Brainstore blog post.If you have experience with database systems, compilers, networks, or storage systems and aspire to pivot your expertise into the AI sector, this role could be your ideal fit. You will significantly influence foundational system architecture, technology selection, and implementation. Our founding team possesses extensive knowledge in database and ML systems, and you will have the autonomy to collaborate closely with them while exploring your innovative ideas.Your ResponsibilitiesAs a systems engineer at Braintrust, you’ll contribute to the core systems that empower Braintrust’s capability to process and query vast amounts of unstructured data at an enterprise scale. Key areas of responsibility include:Enhancing the storage, indexing, and query execution performance of Brainstore.Developing Braintrust's btql query language.Optimizing query patterns to boost performance across our platform.QualificationsDeep understanding of systems programming (C++ or Rust, concurrency, databases, operating systems).Experience in founding or working at startups is advantageous.Familiarity with writing prompts or experimenting with GPT models and applications.BenefitsComprehensive medical, dental, and vision insurance.Daily lunch, snacks, and beverages provided.Flexible time off policy.Competitive salary with equity options.