Senior Powertrain Engineer

About Humble Robotics At Humble Robotics, we are at the forefront of revolutionizing ground transportation. Our mission is to develop an autonomous, zero-emissions hauler that significantly reduces freight costs through innovative vision-based AI technology, tailored for the demands of today’s global logistics landscape. Join our dynamic team of experienced …

Test Engineering Manager - Powertrain (Multiple Roles)Location: South San FranciscoAbout ZiplineAre you ready to make a global impact? Zipline is revolutionizing the logistics industry, aiming to tackle urgent access challenges worldwide. Our innovative instant delivery system serves diverse needs, from supporting national healthcare initiatives in Rwanda and Ghana to providing essential supplies for businesses like Walmart. By utilizing cutting-edge technology, including robotics and autonomy, we're committed to reducing carbon emissions, alleviating traffic congestion, and ensuring equitable access for billions.Join us at Zipline, where we are dedicated to creating a resilient global supply chain for all.About You and the RoleWe are looking for two passionate Hardware Test Engineering Managers to spearhead the development and execution of hardware validation and testing strategies throughout the product lifecycle. These hands-on leadership roles will focus on delivering high-quality, reliable hardware on time. The positions within our Powertrain team include:Energy and Power: Focusing on batteries, cells, charging, power distribution, and energy safety.Electric Drivetrain: Concentrating on electric propulsion, motors, propellers, and electromechanical systems.As a leader, you will guide a diverse team of engineers to develop world-class testing methodologies, equipment, and execution for hardware testing. Your responsibilities will encompass the entire hardware development lifecycle, from performance testing to system-level assessments, durability, environmental survivability, and the automation of production line testing.We are seeking a player-coach who has expertise in either batteries or electric propulsion and can provide strategic direction while being hands-on in technical execution.

Astro-Mechanica is hiring a Senior Rotordynamics Engineer in San Francisco. This position centers on detailed analysis of rotordynamics systems and developing solutions to support ongoing engineering projects. What you will do Perform in-depth analyses of rotordynamics systems Develop technical solutions to address engineering challenges Work closely with cross-functional teams on project advancement Requirements Strong technical background in rotordynamics or a related engineering field Demonstrated commitment to engineering quality and precision Ability to collaborate effectively with colleagues from various disciplines

We are seeking a highly skilled Senior Mechatronics Engineer to join our innovative team at dandy in the vibrant San Francisco Bay Area. In this pivotal role, you will design and develop cutting-edge mechatronic systems that integrate mechanical, electronic, and software components. Your expertise will drive the creation of advanced products that enhance user experience and operational efficiency.Your responsibilities will include collaborating with cross-functional teams, conducting research to inform design decisions, and overseeing the prototyping and testing of mechatronic systems. You will also provide technical guidance and mentorship to junior engineers, contributing to their professional growth.

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.

Join our dynamic team at AECOM as a Senior Electrical Engineer, where you will be at the forefront of innovative projects that shape our cities and communities. In this role, you will leverage your extensive expertise to design electrical systems for a variety of infrastructure projects, ensuring compliance with industry standards while fostering sustainable practices.Your responsibilities will include collaborating with multidisciplinary teams, reviewing and approving engineering designs, and providing mentorship to junior engineers. This is an exciting opportunity to make a significant impact in the field of electrical engineering.

Join Unlimited Industries as a Senior Multidisciplinary Engineer, where you will leverage your expertise across various engineering disciplines to drive innovative solutions. In this role, you will collaborate with cross-functional teams to design, develop, and implement complex systems, contributing to the advancement of our cutting-edge projects.

Join Calendly as a Senior Director of Engineering, where you will lead a talented engineering team to innovate and enhance our platform. In this pivotal role, you will drive strategic initiatives, mentor engineering leaders, and collaborate cross-functionally to deliver exceptional user experiences. We seek a passionate leader who thrives in a fast-paced environment and is committed to fostering a culture of continuous improvement and excellence.

Join Lever as a Senior Engineering Manager, where you'll lead a dedicated team that plays a critical role in maintaining our platform APIs. Your expertise will guide the development of essential services, including user management, authentication, and payment gateways, while fostering a collaborative team environment.We are passionate about building the future of hiring software, which is trusted by industry leaders such as Netflix, Yelp, Cirque du Soleil, Shopify, and Spotify. As a part of our team, you will contribute to a culture that values innovation and growth, and be recognized in a company that has been honored as a top workplace in San Francisco and the broader United States.

About the PositionAs a Senior Backend Engineer at Nash, you will be instrumental in the design and development of our backend systems, services, and APIs. Collaborating closely with our CTO, co-founder, and the engineering and product teams, you will help scale our platform, enhance performance, and build a robust infrastructure that facilitates seamless logistics operations. This role presents an exciting opportunity to contribute to Nash as we create innovative products across the logistics value chain for enterprises, marketplaces, and small to medium-sized businesses (SMBs).Key ResponsibilitiesDesign, develop, and maintain high-performance, scalable backend services and APIs.Architect and implement efficient data structures and models.Optimize system performance, scalability, and security.Debug, troubleshoot, and resolve backend issues in production environments.Work closely with frontend engineers to develop seamless API integrations.Implement best practices for observability, monitoring, and logging to ensure system reliability.Collaborate both independently and as part of a team to tackle complex technical challenges.Promote best practices in documentation, testing, and maintainability.Qualifications4+ years of experience in developing and deploying scalable backend systems.Proficient in Python and related backend frameworks.Experience in designing and utilizing RESTful APIs and databases (e.g., PostgreSQL, AWS RDS).Solid understanding of cloud platforms (preferably AWS) and deployment best practices, including managed services (serverless, databases, queues) and CI/CD pipelines.In-depth knowledge of scalable system design and performance optimization.Exceptional problem-solving skills with the ability to work independently in a dynamic environment.Startup experience is advantageous but not mandatory.Preference for candidates located in the Bay Area; Nash operates a hybrid-first product team with an office in San Francisco.Bonus: Familiarity with AsyncIO and event-driven programming.

Join Lambda, Inc. as a Senior Storage Engineer, where you will play a pivotal role in designing, implementing, and maintaining robust storage solutions. You will work closely with cross-functional teams to optimize storage performance and ensure data integrity. Your expertise will be crucial in enhancing our storage architecture to meet the growing demands of our clients.

About UsWe are an innovative stealth-mode company funded by a16z Speedrun, dedicated to empowering leading consumer brands to achieve exceptional growth. Our cutting-edge solutions have gained the trust of pioneering organizations like Higgsfield and Promova among others. As we expand, we seek talented individuals who are eager to make a significant impact in the realm of consumer technology. You will be part of a passionate team at a crucial juncture, thriving in an environment that champions initiative, ambition, and creative solutions.The RoleAs a Senior Backend Engineer, you will be instrumental in developing and maintaining the essential backend infrastructure that powers our products. Your responsibilities will include:Designing scalable architectures that effectively support new product features and business objectives.Leading the development, deployment, and optimization of backend services to ensure top performance, reliability, and maintainability.Collaborating with cross-functional teams to seamlessly integrate third-party platforms, APIs, and cutting-edge AI technologies.Facilitating technical discussions, providing mentorship, and sharing best practices with fellow team members.Actively contributing to the continuous enhancement of our engineering standards and development workflows.Proactively identifying and addressing complex technical challenges to ensure stable and secure operations.What We ExpectA minimum of 5 years of professional experience in backend development, showcasing a history of delivering reliable and scalable systems.Advanced expertise in server-side programming and experience in designing database-driven applications.A solid understanding of API development, systems integration, and software engineering best practices.Proven experience in building and maintaining production environments that scale effectively for real users.An independent, proactive approach to problem-solving, coupled with the ability to drive projects forward.A commitment to joining our team full-time, with a desire to grow within a fast-paced, ambitious startup.How to ApplyPlease send us a brief introduction about yourself, along with a description of a technical project or system you are most proud of. We are excited to learn how you can contribute to our vision and success.

We are seeking a highly skilled Senior Security Engineer to join our innovative team at Decagon in San Francisco. In this pivotal role, you will be responsible for safeguarding our digital infrastructure and ensuring the security of our systems against potential threats. You will work closely with cross-functional teams to design and implement security solutions, conduct risk assessments, and develop incident response strategies.As a Senior Security Engineer, you will have the opportunity to leverage your expertise in security protocols, threat detection, and vulnerability management to enhance our security posture. Your contributions will be essential in creating a secure environment for our operations and clients.

Role Overview Juul Labs, Inc. is seeking a Senior Mechatronics Engineer in San Francisco, California. This position focuses on designing and developing advanced mechatronic systems for the company’s products. The role involves close collaboration with teams across different disciplines to improve product performance and reliability.

Scribd, Inc. creates products such as Scribd®, Slideshare®, Everand™, and Fable, all with the goal of turning information into insight for users worldwide. The company is dedicated to broadening access to knowledge and expertise on a global level. Culture and Work Style At Scribd, authenticity and bold thinking influence daily decisions and team interactions. Employees are encouraged to share ideas, take initiative, and engage in open dialogue to solve new challenges and meet customer needs. The company’s Scribd Flex policy allows staff to choose their work location and schedule, balanced by planned in-person meetings that help maintain strong team connections. Regardless of where employees live, everyone participates in occasional onsite gatherings to foster collaboration. The company values 'GRIT', a blend of passion and perseverance for long-term goals, which shapes how teams set objectives, innovate, deliver results, and support each other. Quality Engineering Team The Quality Engineering group develops and maintains the testing infrastructure and quality tools that back Scribd’s engineering teams. Their efforts ensure code reliability and support confident releases. Collaboration extends across both the established monolithic codebase and newer microfrontend architectures, with close partnership alongside frontend and platform engineers. Role Overview The Senior Frontend Engineer in Quality Engineering will lead work to expand the quality infrastructure for Scribd’s web engineering teams. As the company moves from a monolithic application toward modular, independently tested components, including microfrontends, this role will help shape the systems that enable that transition. Currently, much of the web platform is still monolithic, with the first microfrontends just entering production. This engineer will design and enhance quality platform capabilities, aiming to increase test ownership, reliability, and developer productivity across all engineering teams.

Join our dynamic team at kinelo as a Senior Product Engineer. In this role, you will leverage your extensive engineering skills to design and implement innovative product solutions that meet our customers' needs. You will collaborate closely with cross-functional teams to drive product development from concept to launch, ensuring high quality and performance standards.

Role Overview Okta is looking for a Senior Analytics Engineer to help shape data-driven decisions across the company. This role focuses on designing and building analytics solutions, improving data architecture, and working with teams from different functions to uncover insights from complex datasets. What You Will Do Design and implement analytics solutions that support business goals Collaborate with colleagues across departments to identify and extract meaningful insights from large data sets Enhance and maintain the company’s data architecture to ensure reliability and scalability About Okta Okta delivers identity management solutions for organizations worldwide. Your work as a Senior Analytics Engineer will help support Okta’s mission to provide secure, seamless access for users everywhere. Locations Bellevue, Washington Chicago, Illinois San Francisco, California

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.

At Fastly, we empower individuals to maintain meaningful connections with the things they cherish. Our cutting-edge edge cloud platform allows customers to deliver exceptional digital experiences with speed, security, and reliability by processing and securing applications as close to end-users as possible — right at the edge of the Internet. Our platform is engineered to harness the potential of the modern internet, enabling programmability and supporting agile software development. We proudly serve some of the world's most influential companies, including GitHub, Yelp, Paramount, and JetBlue.Join us in building a more trustworthy Internet.Posting Open Date: Reposted March 30, 2026Anticipated Posting Close Date*: April 20, 2026*This job posting may close earlier due to high applicant volume. Senior Principal Engineer, Platform EngineeringAs a member of Fastly’s Platform Engineering team, you will be instrumental in establishing the essential frameworks that enable engineers to deliver quickly, safely, and at scale. In the role of Senior Principal Engineer, you will guide the technical direction and spearhead cross-organizational initiatives aimed at enhancing our platform, developer experience, and operational excellence. Collaborating closely with fellow engineers, you will work to eliminate friction, standardize best practices, and create paved roads to expedite product delivery. This is a highly collaborative and hands-on position, representing the Platform Engineering organization and reporting directly to the Senior Director of Engineering.

Flex is hiring a Senior Fullstack Software Engineer to join the Risk Engineering team. This position can be based in New York, San Francisco, or remote within the U.S. Role overview This role centers on designing, building, and maintaining applications that support Flex’s risk management efforts. The Senior Fullstack Software Engineer will collaborate closely with teammates to deliver solutions that improve how risk is assessed and managed across the company. What you will do Develop and maintain both frontend and backend components for risk-related applications Work with team members to design features and solve technical challenges Contribute to projects from initial planning through deployment Requirements Experience in both frontend and backend software development Ability to drive projects through the full development lifecycle Interest in building solutions that support risk management