Senior Mechanical Engineer

Welcome to Planet. We harness the power of space to enhance life on Earth.At Planet, we design, build, and operate the world’s largest constellation of imaging satellites, delivering an unparalleled dataset through our innovative cloud-based platform. This initiative supports a diverse array of industries including commercial, environmental, and humanitarian sectors, positioning us as both a space and data enterprise.Our clients worldwide leverage Planet's data to pioneer new technologies, generate revenue, conduct research, and tackle some of the planet's most pressing challenges.With complete control over hardware design, manufacturing, data processing, and software engineering, our team is an inspiring blend of experts from various fields.We prioritize a people-centric culture and community, continuously evolving to put our team members first as we prepare for growth. Join us at Planet and be part of our mission to transform global perspectives.Planet operates globally, with a flexible working environment that includes remote employees and offices in San Francisco, Washington DC, Germany, Austria, Slovenia, and The Netherlands.About the Role:The Mechanical Engineering team at Planet seeks a skilled Senior Mechanical Engineer to lead the design of critical spacecraft subsystems for our fleet of Earth-imaging satellites. Your role will encompass overseeing spacecraft design initiatives, from subsystem to full spacecraft level. The ideal candidate will be an experienced mechanical designer with a proven track record in leading mechanical subsystem development through all phases, from conceptualization to manufacturing, testing, and flight integration. As a vital member of the Mechanical Engineering team within Planet’s Space Systems division, you will collaborate closely with various teams to drive our agile approach to spacecraft design.This is a full-time position based at our San Francisco headquarters, requiring in-office attendance five days a week.

Astranis is at the forefront of aerospace innovation, crafting cutting-edge satellites designed for high orbits, thereby extending humanity's capabilities into the cosmos. Our satellites deliver dedicated and secure networks to a diverse clientele that includes large corporations, government entities, and the U.S. military. With five satellites currently in orbit and several more set to launch imminently, we are addressing a robust backlog exceeding $1 billion in commercial contracts.As the go-to partner for satellite communications, Astranis caters to clients with demanding needs for uptime, data security, network visibility, and customization. Having secured over $750 million in funding from esteemed investors such as Andreessen Horowitz, Blackrock, and Fidelity, our team of 450 skilled engineers and entrepreneurs thrives in our 153,000 sq. ft. headquarters located in Northern California.Senior Mechanical Engineer - RF PackagingIn the role of Senior Mechanical Engineer for Electronics Packaging at Astranis, you will take full ownership of the lifecycle of various components and subsystems aboard our spacecraft. Collaborating with multiple teams, you will implement incremental improvements and introduce new systems to fruition.Beyond your individual contributions, you will mentor and guide junior mechanical engineers through these projects. A robust problem-solving mindset, hands-on testing capabilities, and preferably experience in spacecraft or aerospace engineering are essential for success in this role.

At Mechanize, we specialize in developing reinforcement learning (RL) environments that empower AI models to execute real-world tasks efficiently. Our mission is to drive the complete automation of the economy, providing innovative solutions to leading AI laboratories. Discover more about our work at mechanize.work.As a Senior Software Engineer at Mechanize, you will contribute to the creation of RL environments that are pivotal in the field of AI model training. Ideal candidates will have 2-5 years of software engineering experience with proficiency in Python programming. Previous experience in machine learning or AI is not a prerequisite.For insights on our interview process, visit: Interview Process at Mechanize.

Join mechanize as a Senior Software Engineer, where you'll contribute to innovative software solutions that shape the future of technology. In this role, you will lead projects, mentor junior developers, and collaborate with cross-functional teams to deliver high-quality software products. Your expertise will drive architectural decisions and enhance our development processes.

At Mechanize, we are pioneering the development of Reinforcement Learning (RL) environments tailored to train AI models for real-world applications. Our ambition is to facilitate the complete automation of the economy, partnering with leading AI laboratories. Discover more at mechanize.work.As a Software Engineering Intern at Mechanize, you will play a pivotal role in assisting our team to develop these groundbreaking RL environments. If you have a solid command of Python programming and possess a keen intellect, we would love to hear from you.We are currently seeking interns for Winter 2026, Spring 2026, and Summer 2026.No prior experience in machine learning or AI is necessary.Curious about our interview process? Learn more here: https://www.mechanize.work/how-our-interview-process-works/

Astranis is at the forefront of satellite innovation, designing and building advanced satellites for high orbits that expand humanity’s reach into the solar system. Our satellites deliver dedicated, secure networks to sophisticated clients globally, including large enterprises, sovereign governments, and the US military. With five satellites currently in orbit and many more set to launch, we are committed to fulfilling over $1 billion in commercial contracts.Astranis is the trusted partner for satellite communications, meeting the stringent demands for uptime, data security, network visibility, and customization. Having secured over $750 million from renowned investors such as Andreessen Horowitz, Blackrock, and Fidelity, our team consists of 450 talented engineers and entrepreneurs based in a state-of-the-art 153,000 sq. ft. headquarters in Northern California, USA.Senior Electronics Component EngineerAs a Senior Electronics Component Engineer at Astranis, you will be instrumental in selecting high-quality, reliable, and sourceable EEE parts and components for our satellite systems. This role demands a thorough understanding of part construction, the ability to identify potential quality and reliability risks, and the expertise to define and implement essential screening tests to mitigate these risks efficiently.Role ResponsibilitiesAnalyze part construction to uncover quality and reliability risks, ensuring all components meet mission-critical standards.Collaborate closely with design engineers to facilitate component selection during the design phase, ensuring compliance with Astranis’s rigorous standards.Plan, execute, and oversee component-level screening and qualification testing.Review bills of materials for new designs to confirm the use of approved flight parts.Manage component supplier part change notifications and initiate appropriate responses to supplier PCNs.Conduct tear-downs on critical components to evaluate part quality and reliability.Work with supply chain, design, and manufacturing teams to resolve component-related sourcing challenges.Maintain the Astranis approved parts list in PLM to ensure accurate information is available to engineering and manufacturing teams.

Role overview AECOM is hiring a Senior Mechanical Engineer in San Francisco. This role leads project work and collaborates with teams across disciplines. The focus: designing, developing, and implementing mechanical systems that support efficiency and sustainability goals.

ABOUT PAX At PAX, we are dedicated to transforming lives through outstanding consumer experiences. Our commitment to innovation, scientifically-backed quality, and award-winning design has established us as a leader in the industry for nearly two decades. Millions trust our high-performance products, which are crafted for precision, purity, and consistency. Our culture revolves around prioritizing people, making impactful contributions together, and enjoying the journey. We believe that exceptional products, a fulfilling employee experience, and robust operational rhythms are interconnected. PAX has garnered accolades for its brand, culture, and products from esteemed publications, including The New York Times’ Wirecutter, TIME, Fast Company, GQ, Gear Patrol, mg Magazine, and High Times. Furthermore, we are proud to be certified Plastic Negative across all product lines by rePurpose Global, ensuring that we remove twice as much plastic from nature as we use in our products. ROLE OVERVIEW As a Senior Mechanical Engineer reporting to the Director of Mechanical Engineering, you will spearhead the design of innovative, cost-effective, and reliable products that meet delivery schedules. You will also troubleshoot and enhance existing products while collaborating closely with engineering colleagues to devise optimal solutions for complex design, structural, thermal, and battery life challenges. Proficiency in sketching and prototyping new concepts, along with familiarity with engineering best practices, will be essential. You may also guide and oversee the work of junior team members. Our products are celebrated for their exquisite design, high quality, and reliability. Our Mechanical Engineers play a vital role in shaping the architecture and detailed design of all our products, working in tandem with the Hardware team to realize the product vision. This role is pivotal in leading the development of future innovations. Key Responsibilities: Collaborate with cross-functional teams to develop high-quality products that exceed customer expectations. Partner with Industrial Design to evaluate product features for manufacturability and recommend efficient processes and equipment. Lead the development of mechanical product architectures, assemblies/modules, parts, and accessories. Design detailed mechanical components, including complex assemblies and sub-systems. Conduct feasibility studies to ensure designs meet mechanical robustness, scheduling, and cost targets. Oversee both internal and external prototyping efforts. Facilitate design reviews and promote engineering best practices.

ABOUT US:At Astro Mechanica, we are pioneering the future of aerospace technology with a commitment to creating faster and more interconnected travel solutions. Our mission is to democratize high-speed flight, making supersonic travel not only flexible and accessible but also sustainable. We envision a world where rapid, on-demand global mobility is the norm for transporting people and goods. To bring this vision to life, we are fusing our advanced airframe and engine technologies, including our innovative Duality™ propulsion system, with a new operational framework that ensures supersonic transport is as efficient and economical as today’s commercial air travel. In the near term, our focus is on developing adaptable high-speed systems to bridge performance gaps for the United States government.WHO WE ARE:We are a dedicated team of passionate engineers entrenched in the aerospace sector. Our flat organizational structure encourages collaboration among generalists and specialists alike, fostering a culture where innovative ideas flourish. We operate at a rapid pace, driven by a commitment to building transformative technology in a pragmatic and skilled environment.WHO YOU ARE:Astro Mechanica is on the lookout for a seasoned Senior Mechanical Engineer who is ready to take ownership of hardware design from the conceptual phase through to production. The right candidate will possess a deep understanding of how their designs impact surrounding systems and will tackle technical challenges with a first-principles approach. Your contributions will directly influence the configuration and performance of our Duality™ engine.In this position, you will lead the journey of our cutting-edge jet engine and its subsystems from early prototypes to flight qualification, vehicle integration, and actual flight. You will embody the philosophy of testing as you fly.WHAT YOU’LL DO:Conduct design trade studies while considering system-level impacts.Complete detailed designs supported by structural, thermal, and fluid analyses.Lead design reviews and gather feedback from stakeholders.Build prototypes directly, design necessary tooling, and create work instructions.Perform hardware tests and analyze data to confirm compliance with requirements and performance metrics.Efficiently diagnose hardware issues and identify corrective actions.WHAT WE’RE LOOKING FOR:10+ years of hands-on experience with fluid dynamics and mechanical design in aerospace applications.

At Mechanize, we are on a mission to revolutionize the economy through the automation of real-world tasks. We specialize in building reinforcement learning (RL) environments designed to enhance AI models, enabling them to tackle complex challenges. Our innovative solutions are trusted by leading AI laboratories. Discover more about our work at mechanize.work.As a Junior Software Engineer at Mechanize, you will play a key role in developing RL environments that cater to the needs of the top AI labs. This position is ideal for individuals who are nearing graduation or have 0-2 years of experience in software engineering, and possess proficiency in Python programming.Prior experience in machine learning or AI is not a requirement.Curious about our interview process? Learn more about it here.

Impulse is a San Francisco-based team of engineers, designers, and innovators dedicated to making sustainable choices at home more accessible and appealing. The company focuses on designing high-performance products that support scalable home electrification and blend seamlessly into daily routines. As a VC-backed startup, Impulse is laying the groundwork for lasting change in a pivotal industry and welcomes those who want to help shape its future. Role overview The Mechanical Engineer will work from Impulse’s headquarters in the Design District of San Francisco. This role centers on designing, architecting, and supporting the manufacturing of new products. Collaboration is key: expect to work closely with software developers, product managers, and company leadership. Regular on-site presence is required, though working remotely 1-2 days per week may be possible for the right candidate. What you will do Develop hardware products as part of a growing company with a forward-looking mission. Create durable architectures that shape both current and future product lines. Work with cross-functional teams throughout product definition and development. Build and test functional prototypes to refine designs. Engage in hands-on design and testing of new and experimental technologies. Support ongoing production and improvement efforts, focusing on design and manufacturing processes for both existing and upcoming products. Contribute to bringing production-ready devices to market. Oversee volume manufacturing for a new category of products. Requirements Minimum of 7 years’ experience in mechanical engineering. Demonstrated success developing and launching high-quality products in consumer electronics, automotive, or IoT sectors. Advanced skills in mechanical CAD software, particularly SolidWorks. Strong communication abilities, including explaining complex technical concepts to varied audiences. Location This position is based in the Design District of San Francisco, CA. Regular commuting to the San Francisco HQ is expected. While on-site work is preferred, some remote work (1-2 days per week) may be considered.

Join Marathon Fusion as a Senior Mechanical EngineerAt Marathon Fusion, we are pioneering the engineering technologies required to transform fusion science from experimental concepts into operational power plants. While much of the field is focused on developing new fusion devices, our mission centers around creating practical systems that facilitate the large-scale deployment of fusion energy, essential for addressing climate change.Our expertise lies in developing vital technologies for the fuel cycle and plant operations that enable stable isotope production, fuel cycle closure, and advanced blanket systems, which are crucial for energy generation and producing high-value co-products.Founded in 2023, Marathon Fusion is on a mission to build the components and systems required to make fusion a practical, abundant, and reliable energy source for the future.Our CultureWe operate in a dynamic startup environment that demands focus, adaptability, and the ability to prioritize in a rapidly changing landscape. Success here requires exceptional proactive communication, the ability to foster trust among team members, and a commitment to continuous learning and skill development. We place a strong emphasis on self-direction and initiative within our team.About Your RoleAs a Senior Mechanical Engineer on our Lithium Team, you will collaborate with electrical and mechanical engineers, physicists, and scientists to prototype, test, and implement innovative solutions aimed at advancing the fusion fuel cycle. Your hands-on design and testing experience with electromechanical systems will be instrumental in developing and refining a groundbreaking isotope separation device.Your ResponsibilitiesLead the design and enhancement of the isotope separation system, focusing on robust and scalable deployment.Prototype, test, and troubleshoot individual components and integrated systems, working closely with fellow engineers, physicists, and technicians.Develop a deep understanding of key physical processes and utilize experimental data and literature to guide improvements.Thoroughly document experimental outcomes and decisions to inform design iterations and process enhancements.Mentor junior engineers, fostering their technical development and sound engineering judgment.Your QualificationsBachelor's degree or higher in Mechanical or Aerospace Engineering, or a related discipline.A minimum of 5 years of experience in designing, prototyping, and testing electromechanical systems.

Echo Neurotechnologies builds Brain-Computer Interface (BCI) hardware and artificial intelligence solutions in San Francisco. The team’s work centers on developing technology that supports greater independence and quality of life for people with disabilities. At Echo Neurotechnologies, a small and skilled group collaborates closely. Team members often contribute across different functions, and each person’s input shapes the direction of projects. The environment values hands-on work, learning, and growth, giving everyone a real chance to influence outcomes. Role overview This Senior Electronics Technician position is hands-on and emphasizes careful craftsmanship. The role suits someone who takes pride in precision and wants to see their work directly impact medical technology. Practical experience matters more than formal degrees for this position. Key responsibilities Solder and rework printed circuit boards (PCBs), including 0201 discretes and fine-pitch BGAs, using magnification tools Modify boards, troubleshoot issues, and support rapid design changes Follow detailed work instructions, schematics, and testing protocols accurately Test both incoming and assembled hardware, recording results clearly Inspect incoming hardware to ensure quality standards are met Help organize and maintain the lab, including equipment upkeep and basic management tasks Calibrate and maintain test equipment, and coordinate with outside vendors as needed Work closely with engineers to solve problems and improve designs Requirements Strong hands-on experience with fine-pitch soldering and PCB rework Comfort working under magnification with small, fragile components

Become part of a pioneering chiplet interconnect startup! We are on the lookout for a skilled Senior/Staff Packaging Engineer who specializes in electro-thermal simulation to enhance our advanced packaging team. In this role, you will spearhead the development of in-depth thermal and electrical simulations for cutting-edge semiconductor packaging solutions, focusing on 2.5D/3D IC integration, chiplet-based systems, and innovative heterogeneous integration technologies. Your contributions will be vital in driving high-performance computing, AI accelerators, and advanced chiplet architectures. We pride ourselves on fostering a dynamic work environment with exceptional benefits. This position is ONSITE, Monday through Friday.

Role overview Senior Mechanical Engineers at the City and County of San Francisco play a key role in supporting projects that shape the city’s infrastructure. This position centers on designing, developing, and implementing mechanical systems for public works and municipal needs throughout San Francisco. Key responsibilities Create mechanical designs for a variety of public projects citywide Develop and put into practice systems that strengthen infrastructure and advance sustainability Work closely with a multidisciplinary team committed to public service Work environment This team is dedicated to improving San Francisco’s built environment. Senior Mechanical Engineers contribute directly to the city’s development and ongoing sustainability efforts, leaving a tangible mark on the community.

Join our dynamic team at plaud as an Electronic Engineer. In this role, you will be responsible for designing, developing, and testing electronic systems and components. Your innovative solutions will help drive our projects forward, ensuring we remain at the forefront of technology.

Join gridware as a Senior Research Engineer in Solid Mechanics, where you will lead innovative projects focused on advancing solid mechanics technologies. In this pivotal role, you will collaborate with multidisciplinary teams to develop cutting-edge solutions that address real-world challenges.

Join Bright Machines as a Senior Mechanical Engineer, where you will play a pivotal role in designing and developing innovative automated solutions. Your expertise will contribute to our mission of transforming manufacturing through advanced technology.

About the TeamFounded in 2018, DoorDash Labs is the innovation engine of DoorDash, dedicated to pioneering automation and robotics solutions that enhance last-mile logistics. Our mission is to develop technologies that empower human networks, driving efficiency for Dashers, merchants, and consumers. With a focus on impactful business solutions, our highly experienced team is composed of industry leaders from various robotics fields. As we look towards the future, we aim to improve upon our achievement of 10 billion deliveries by 2025.About the RoleWe are looking for a Senior Electrical Engineer to join our dynamic, multidisciplinary team, specializing in the creation of production-grade electrical systems for consumer and enterprise hardware platforms, including tablets, POS systems, peripherals, and connected devices.This role requires a robust background in mixed-signal board design, power systems, wireless integration, and high-volume product development. The ideal candidate is passionate about designing and delivering reliable hardware at scale, thriving in an environment that demands technical expertise and high-quality execution across multiple concurrent projects.You’re excited about this opportunity because you will…Architect and implement electrical subsystems, including:Power systems: battery management, charging, DC/DC converters, power distribution, and protection.Digital and mixed-signal board design: application processors, MCUs, high-speed interfaces (USB, PCIe, MIPI, etc.), memory, and sensor integration.Wireless systems: WiFi, BLE, LTE, antennas, and EMI/EMC-conscious layout and integration.Peripheral and display integration: touch interfaces, display subsystems, and external connectivity.Key ResponsibilitiesOwn the full lifecycle of electrical hardware from concept through schematic capture, layout review, bring-up, validation, certification, and production.