Guidance, Navigation & Control (GNC) Simulation Software Engineer

Astranis is at the forefront of satellite technology, specializing in the construction of advanced satellites designed for high geostationary orbits. Our innovative solutions extend humanity's reach into the solar system, delivering dedicated and secure network services to a diverse range of esteemed clients, including large corporations, sovereign nations, and the United States military. With five operational satellites and numerous upcoming launches, we are committed to fulfilling over $1 billion in commercial contracts.We pride ourselves on being the go-to partner for satellite communications, particularly for clients with rigorous demands regarding uptime, data security, network visibility, and customization. Backed by over $750 million in funding from prominent investors such as Andreessen Horowitz, Blackrock, and Fidelity, our team of 450 engineers and entrepreneurs is dedicated to advancing satellite technology. All operations, from design to assembly, are conducted in our state-of-the-art 153,000 sq. ft. headquarters located in Northern California.Position OverviewAs a Simulation Software Engineer within our Guidance, Navigation, and Control (GNC) team, you will play a pivotal role in designing, developing, and testing high-fidelity spacecraft simulations that validate the software controlling our satellites in orbit.In this position, you will enhance our core simulation infrastructure and work collaboratively with cross-functional engineering teams to model new systems and introduce exciting features into the simulator.

About Poseidon Aerospace:At Poseidon Aerospace, we are pioneering the future of aviation by developing and operating cutting-edge unmanned aircraft designed for commercial logistics and defense operations. With our innovative fixed-wing platforms, Heron, a versatile seaplane, and Egret, a high-performance STOL aircraft, we excel in delivering two tons of payload over distances exceeding a thousand nautical miles. Our headquarters is based in the vibrant city of San Francisco, complemented by strategic satellite offices in Washington, DC, and Maine.As a GNC Engineer at Poseidon Aerospace, you will play a vital role in shaping the control systems that guarantee the precision and reliability of our aircraft. Your responsibilities will span vehicle dynamics modeling, flight control system design, and seamlessly integrating these solutions into our flight-ready avionics. We seek a candidate with deep expertise in GNC development, from theoretical modeling to practical implementation.

Join Astranis as a Senior GNC Controls Engineer and play a pivotal role in shaping the future of satellite technology. In this position, you will be responsible for the design, development, and implementation of innovative Guidance, Navigation, and Control (GNC) systems that will drive our satellite missions to success. You will collaborate with a talented team of engineers and contribute to projects that are transforming the space industry.

Why You Should Consider Joining DoppelAt Doppel, we are dedicated to combating one of the most pressing challenges posed by AI: the rise of mass-manufactured social engineering. With an alarming increase in scams, deepfakes, and various social engineering tactics infiltrating every digital platform—be it websites, social media, advertisements, or encrypted messaging applications—our mission is both straightforward and ambitious: to enhance internet safety by outsmarting the most rapidly evolving digital threats.Supported by leading investors and trusted by some of the world’s most prestigious brands, Doppel is on an exhilarating growth trajectory. If you are passionate about tackling real-world issues with innovative technology, we would be thrilled to connect with you.Our VisionWe are developing an AI-driven social engineering defense platform.This entails creating scalable systems that surveil billions of domains, social media accounts, applications, dark web forums, and more, utilizing AI agents to detect and mitigate digital threats.Your RoleWe are seeking a skilled full-stack engineer to contribute to the development of our innovative Simulation product. The Simulation team operates like a startup within a startup, within Doppel (a Series C company backed by Bessemer and a16z) and has already surpassed six figures in revenue shortly after launch, with a trajectory aiming for 1M ARR in Q4.Our goal is to empower businesses to proactively defend against the forthcoming wave of social-engineering attacks. We are crafting AI-driven phishing simulations that employ advanced language models and voice synthesis to replicate authentic threats—ranging from highly personalized emails to realistic “manager calls” that assess and train enterprise security teams.Joining our team means collaborating with leaders who have backgrounds at Meta and Y Combinator and are already engaging with Fortune 100 clients. This is a unique opportunity to experience the rapid growth and creativity of a startup, coupled with the stability and backing of an established company. It's the ideal environment to innovate quickly, implement meaningful change, and help shape an emerging market.Having just launched, we are witnessing fast-growing market traction and are eager for individuals who are excited to take initiative and fulfill our customers' pressing needs. For instance:Develop a “Cursor for phishing simulation” workflow that enables users to create simulations using natural language.Create voice deepfakes that utilize AI to impersonate employees during calls.

About Point One Navigation:At Point One Navigation, we are dedicated to seamlessly integrating the digital and physical worlds by providing precise location services. Our cutting-edge Polaris™ RTK network and FusionEngine™ software offer centimeter-level accuracy and reliable positioning solutions for a diverse range of applications, including vehicles, robots, drones, and other devices. With a strong focus on developers and an API-first approach, we are at the forefront of enhancing autonomy and automation across industries.The Role:We are on the lookout for a Staff Embedded Software Engineer (Generalist) who excels at the intersection of hardware and software. As a pivotal member of our embedded systems team, you will be responsible for developing high-performance, real-time software that integrates a variety of sensors and navigation technologies. This position is perfect for an individual who is adept at managing complex technical challenges from initial architecture through to deployment in mission-critical environments.What You’ll Do:Lead the design, implementation, and optimization of embedded C++ software tailored for real-time sensor fusion and positioning systems.Architect robust systems that unite GNSS receivers, inertial sensors, wheel odometry, cameras, and other hardware within dynamic environments.Drive performance tuning and implement low-level optimizations across various embedded platforms, including ARM, microcontrollers, and embedded Linux.Mentor junior engineers while contributing to the establishment of engineering best practices across the team.Take ownership of critical components within the embedded software stack, from board bring-up and driver development to system-level debugging and performance analysis.Collaborate with cross-functional teams, including hardware, firmware, cloud infrastructure, and robotics customers, to deliver reliable end-to-end systems.Contribute to the technical strategy, engage in architecture discussions, and assist in roadmap planning.

Waymo is at the forefront of autonomous driving technology, dedicated to becoming the most trusted driver globally. Originating from the Google Self-Driving Car Project in 2009, our primary goal has been to develop the Waymo Driver—The World’s Most Experienced Driver™. Our innovations aim to enhance mobility access while saving countless lives lost to traffic accidents. The Waymo Driver powers our fully autonomous ride-hail services and is adaptable across various vehicle platforms and product applications. Having completed over ten million rider-only trips, our technology has autonomously navigated over 100 million miles on public roads and executed tens of billions of miles in simulations across more than 15 U.S. states.Your Role:Lead the technical strategy for the Simulator’s issue response lifecycle, encompassing automated detection, root cause analysis, and the deployment of both temporary and permanent software solutions to prevent future regressions.Direct complex, cross-functional projects to enhance automated issue detection by integrating new data sources and signals, thus reducing the time from an in-field event to mitigation deployment.Work closely with Data Science, Systems Engineering, and operations teams to improve technical processes and tools, accelerating the deployment and validation of solutions for identified issues.Mentor mid-level and junior engineers on sophisticated technical challenges, best practices in system architecture, and high-quality software development, serving as a technical force multiplier.

Why Join UsAt Brex, we are revolutionizing corporate spending with our AI-driven platform. We empower businesses to manage their expenses confidently through integrated corporate cards, banking services, and global payment solutions, complemented by intuitive software for travel and expense management. From startups to established enterprises like DoorDash, Flexport, and Compass, thousands of companies rely on Brex to control spending proactively, reduce costs, and enhance efficiency on a global scale.Joining Brex means pushing your limits, questioning the status quo, and collaborating with some of the industry’s brightest minds. We are dedicated to fostering a diverse team and an inclusive culture, believing that your potential should only be limited by your dreams. We empower you with the tools, resources, and support needed to advance your career.AI at BrexOur AI Engineering team is redefining finance management by embedding intelligent, autonomous systems into the Brex platform. We develop AI agents that not only provide insights but also take action to optimize spending, manage workflows, and make real-time decisions for our customers. By integrating proprietary financial data with our product and platform infrastructure, we simplify complex financial operations into seamless, automated experiences, setting a new standard for modern finance.What You’ll DoAs a Senior Software Engineer, you will be responsible for Brex’s simulation and validation platform for AI-driven products. Your primary goal is to ensure that every AI interface at Brex is rigorously tested under realistic conditions, enabling teams to deploy with confidence.You will design a system that leverages synthetic data and scenario generation to create a recursive self-improvement loop. Product teams will depend on this platform to detect regressions proactively, validate new features safely, and continuously refine prompts and agent behaviors. This platform will operate within isolated, ephemeral environments closely resembling production.This is not a research position; it involves actively engaging with real products, creatively breaking them to foster organizational improvement.Where You’ll WorkThis position is based in our San Francisco office. We offer a hybrid work environment that blends the energy of in-office collaboration with the flexibility of remote work. We require team members to be in the office three days a week—Monday, Wednesday, and Thursday—while also allowing up to four weeks of fully remote work each year!

tvScientific, now part of Pinterest, develops a connected TV (CTV) advertising platform designed for performance marketers. The platform combines media buying, optimization, measurement, and attribution, all in one place. The team includes industry veterans with experience in programmatic advertising, digital media, and ad verification. Advertisers use tvScientific to automate and enhance TV ad campaigns, drawing on large-scale data and advanced technology to improve results and scale efficiently. Role overview The Senior Software Engineer - AI & Simulation will focus on expanding simulation and AI features within the platform. This role centers on designing and building systems that represent the CTV advertising landscape. Key areas include: Simulating auction mechanics and bidding strategies Modeling campaign performance and testing counterfactual scenarios In addition, this engineer will help develop AI-powered tools that accelerate the creation, evaluation, and deployment of machine learning systems. Location This position is based in San Francisco, CA, or can be performed remotely within the United States.

Join Waymo as a Staff Software Engineer specializing in Simulation Capacity Optimization. In this pivotal role, you will leverage your expertise in software engineering and simulation technology to enhance our autonomous vehicle systems. Your contributions will be vital in optimizing the performance and efficiency of our simulations, ensuring that our vehicles are equipped to navigate the complexities of real-world environments.

About Our TeamJoin our innovative Robotics team at OpenAI, where we are dedicated to pioneering general-purpose robotics and advancing towards AGI-level intelligence in dynamic, real-world environments. By working across the entire model stack, we seamlessly integrate state-of-the-art hardware and software to explore a wide variety of robotic form factors. Our mission is to harmoniously combine advanced AI capabilities with the constraints of physical systems, ultimately enhancing the lives of individuals worldwide.About the RoleWe are on the lookout for a passionate Simulation Realism Engineer to lead our initiative in achieving quantitative realism in simulation for robotics research and product development. You will be responsible for devising strategies, tools, and operational practices that bridge the sim-to-real gaps across physics, sensors, and rendering. Collaborating cross-functionally with research, software, hardware, and operations teams, you will identify key realism gaps, establish measurable realism metrics, and deliver impactful engineering solutions — from fine-tuning engine parameters and setting asset standards to integrating third-party engines and managing simulations at scale. This hands-on engineering role combines scientific precision (measurement & validation) with practical systems work (tooling, cloud ops, and CI/HIL pipelines).This position is based in San Francisco, CA, with a requirement of 4 days in the office per week. Relocation assistance is available for new hires.Your Responsibilities:Establish and operationalize realism metrics & protocols. Design experiments and automated tests to identify specific areas of non-realism, quantify gaps, and monitor regressions over time.Optimize engine parameters (contacts, friction, mass/density, solver settings) and object models to ensure simulated dynamics align with real-world measurements.Assess, integrate, and where necessary, extend third-party physics, rendering, and sensor simulation engines (e.g., Isaac, PhysX, MuJoCo). Lead vendor proof of concepts and benchmark features to inform roadmaps.Develop standards and guidelines for authoring and validating asset physical/visual properties; implement semi- or fully-automated pipelines to tune and optimize assets for target engines.Resolve technical challenges related to running engines in the cloud (OS, drivers, GPU), parallelize simulations (batch multiple runs per engine instance), and fortify real-world-facing pipelines to ensure reliable simulation at scale.Lead validation campaigns (teleoperation, HI...) to verify simulation accuracy and performance.

The Bot CompanyAt The Bot Company, we are on a mission to create an innovative robot for every household.Located in the heart of San Francisco, our dedicated team consists of talented engineers, designers, and operators with backgrounds from industry leaders like Tesla, Cruise, OpenAI, Google, and Pixar. Our collective experience includes delivering products to hundreds of millions of users, and we understand what it takes to craft extraordinary products and experiences.Our lean team structure fosters rapid decision-making and minimizes bureaucracy, allowing every individual to take ownership and responsibility. We embrace a culture of rapid iteration and swift execution, encouraging collaboration across various domains.Ideal Candidate TraitsWe seek candidates who exhibit exceptional sharpness and the ability to thrive in fast-paced, high-stakes environments. Throughout the hiring process, candidates should demonstrate:Exceptional mental acuity: Quick thinkers who can learn rapidly and navigate unfamiliar challenges.Engineering curiosity: A natural inclination to explore how systems operate, even beyond one's area of expertise.High-performance mindset: Ability to adapt swiftly, manage ambiguity, and excel in demanding situations.Role Overview: Simulation EngineerAs a Simulation Engineer, you will be responsible for developing and enhancing the simulation systems that drive our robotics development workflow. This includes implementing new simulation features, adjusting framework internals, and leveraging tools such as Isaac or MuJoCo to accurately replicate complex real-world behaviors.RequirementsProficient coding skills in Python and/or C++.Significant experience with Isaac or MuJoCo, including making substantial framework-level modifications and developing new functionalities.A strong academic or open-source background: high-quality datasets, public code contributions, a robust GitHub presence, and publications as a primary author.Key ResponsibilitiesDevelop new simulation features while extending the core physics and engine internals.Design high-fidelity simulations of robotic systems and their environments.Work collaboratively with cross-functional teams in robotics, perception, and platform domains to ensure simulation precision and scalability.Drive rapid execution and iteration on simulation improvements.

Mapbox stands at the forefront of the real-time location technology landscape, empowering a new era of location-aware enterprises. As the sole platform offering an extensive suite of tools, Mapbox enables organizations to facilitate navigation for individuals, packages, and vehicles globally. With over 4 million developers embracing Mapbox for its adaptability, robust security, and compliance with privacy standards, our platform is the preferred choice for creating tailored and immersive experiences that captivate users.Our MissionThe Navigation division, along with the SDK and Dash teams, is dedicated to developing frameworks, APIs, SDKs, and applications that deliver navigation solutions across various platforms. Our SDK is utilized by clients in automotive, logistics, and consumer applications across Android, iOS, and Linux, catering to both large and small enterprises. Our developers consistently create applications and navigation experiences that excel in app store rankings, and we are committed to collaborating with them to innovate future solutions, ranging from AI-driven experiences and popular consumer apps to enterprise applications for extensive fleets, rideshare solutions, and autonomous driving technologies.At Mapbox, we are transforming in-car experiences by leveraging cutting-edge technology to produce rapid, industry-leading maps and navigation systems suitable for any vehicle. Our innovative products, such as MapGPT and Mapbox for EV, enhance in-vehicle navigation through advanced 3D styling available via our web and mobile SDKs. We collaborate with esteemed automotive partners such as BMW, Toyota, and GM, as well as on-demand logistics providers, to integrate the best features of mobile app development into in-vehicle navigation and infotainment systems.Mapbox Navigation: A Guide to Navigation SDK & APIsMapbox Newsroom: AI Features in New Navigation SDKMapbox Blog: Introducing 3D Live Navigation

About Us:Point One Navigation is at the forefront of redefining precise location technology. Our vision is to create a comprehensive location platform that empowers innovation, enhances safety, and boosts efficiency across various sectors, including robotics and transportation. We pride ourselves on being a dynamic and collaborative team that excels at tackling intricate challenges swiftly and effectively.The Role:We are on the lookout for a talented Staff Engineer to enhance our Backend Services team. In this pivotal role, you will be instrumental in shaping the architecture of our systems and developing services that underpin our global corrections network and real-time location capabilities.Key Responsibilities:Design, develop, and sustain high-performance backend services and network systems using Go and Java.Create detailed systems design documentation, architectural decision records, and comprehensive technical specifications.Engage actively in the formulation of technical strategies, architectural discussions, and infrastructure roadmap planning.Enhance the performance and reliability of mission-critical, globally distributed systems.Collaborate with cross-functional teams to deliver integrated solutions for real-time data processing and corrections delivery.Assume ownership of significant backend infrastructure components, ensuring their design, deployment, and continuous monitoring.

About the RoleAs a Software Engineer specializing in Robotics Controls, you will take charge of the software that drives our robotic systems. Your role will involve close collaboration with machine learning teams to transform intended actions into smooth, efficient, and safe movements across various robotic embodiments. You will work alongside hardware engineers and partners to ensure optimal performance of systems, dynamics, and components.Key Responsibilities:Develop, implement, and rigorously test the complete real-time control system, ranging from low-level firmware to specifications for each robotic embodiment.Manage various robotic embodiments, from standard industrial collaborative robot arms to custom-designed hardware.Ideal Candidate Profile:Extensive knowledge in rigid body kinematics and robotic control systems.Proven experience in deploying robots in production environments with high reliability standards.Proficiency in high-performance, production-ready programming using Python and C++.Familiarity with kinematics and simulation libraries.Experience with robotic middleware frameworks such as ROS/ROS2/ZCM.

Join Our Innovative Robotics TeamAt OpenAI, our Robotics team is dedicated to pioneering general-purpose robotics and striving towards artificial general intelligence (AGI) within dynamic, real-world environments. By integrating advanced hardware and software, we explore a diverse array of robotic configurations, aiming to harmoniously combine high-level AI capabilities with the physical constraints of real-world systems to enhance everyday lives.Your Role as a Simulation Environments EngineerWe are seeking a talented Simulation Environments Engineer to develop the tools and infrastructure that facilitate the creation of comprehensive, realistic virtual environments for robotics research and evaluation. This position emphasizes building systems that empower researchers and engineers to define, visualize, generate, and validate task environments efficiently and at scale. You will design processes for importing and validating third-party content, develop procedural and randomized scenario generators, and produce user-friendly tools to streamline environment creation, making it swift, repeatable, and testable. This role sits at the convergence of game-engine expertise, asset engineering, and extensive simulation infrastructure.Location and Work ScheduleThis position is based in San Francisco, CA, requiring in-person collaboration three days a week.Key ResponsibilitiesDevelop interactive and programmatic tools for researchers to describe, preview, and validate scenes and tasks, enabling quick and consistent scenario authoring.Establish content pipelines to curate, convert, optimize, and quality-check visual and collision assets from both external collections and internal resources, ensuring consistent behavior across engines and tasks.Create robust importers and adapters to integrate environments and setups from platforms such as Isaac, Unity, Unreal, and Omniverse into our simulation pipelines, maintaining fidelity and performance.Develop frameworks for procedural generation and controlled randomization (covering visual, physical, and kinematic aspects) to provide models with systematic, measurable variations in conditions.Define and uphold quality standards for environments (including visual fidelity, collision accuracy, and physical realism) and implement validation tools to ensure environments meet established realism and coverage objectives.Link environment tools to CI/CD processes, presubmit checks, large-scale simulation farms, and model evaluation pipelines to facilitate automatic testing and large-scale execution of environments.

About the Role Crusoe is seeking a Software Engineer focused on the Control Plane to help build and improve control systems. This position is based in San Francisco, CA. What You Will Do Develop and refine software that powers Crusoe's control systems Work closely with teammates to solve complex technical challenges Contribute ideas and code to projects that drive the platform forward Who We’re Looking For Experience building or maintaining control plane software Comfort working in a collaborative setting Interest in tackling sophisticated software engineering problems If you enjoy building systems and want to make an impact on Crusoe’s technology, this role offers the chance to work with a dedicated team on meaningful projects.

ABOUT US:Astro Mechanica is a pioneering aerospace firm committed to creating a future defined by rapid, interconnected flight. Our vision is to revolutionize high-speed aviation, making supersonic travel not just a luxury, but a sustainable, accessible option for everyone. We aim to establish on-demand, point-to-point global mobility as the norm, enabling seamless transport of people and goods across the globe. To realize this ambitious goal, we are unifying our cutting-edge airframe and engine technologies, including our unique Duality™ propulsion system, with an innovative flight operations model that positions supersonic transport on par with today's commercial aviation efficiency and affordability. In the short term, we are focused on developing adaptable, high-speed systems to meet the performance requirements of the United States government.WHO WE ARE:Our team is made up of enthusiastic engineers who share a commitment to pushing the boundaries of aerospace technology. We pride ourselves on being versatile thinkers with specialized knowledge, operating within a flat organizational structure that prioritizes collaboration and engineering excellence. We prioritize agility, practicality, and a relentless pursuit of high-quality outcomes.WHO YOU ARE:As a GNC Engineer, you’re eager to take full ownership of the guidance and control systems for a novel autonomous aircraft. You thrive on working from foundational principles, engaging closely with propulsion, structures, and avionics teams, and making informed trade-offs to achieve flight-ready hardware. Your passion lies in understanding real-world system behaviors—not just theoretical simulations—and you are driven to create control architectures that are robust, verifiable, and flight-ready.WHAT YOU’LL DO:Develop and implement cutting-edge guidance, navigation, and control systems for our innovative products.Participate in multi-disciplinary aircraft assessments to shape the overall system architecture.Create 6-DOF dynamics simulation models for analysis and validation processes.Design tools to automate control design, Monte Carlo simulations, and validation efforts.Collaborate closely with engineering colleagues to define control schemes and mechanisms for our products.Support flight and ground testing operations.Conduct thorough post-flight/test reviews, correlating performance data with analyses for ongoing improvement in predictive capabilities.WHAT WE’RE LOOKING FOR:A strong background in guidance, navigation, and control engineering.Experience with simulation software and modeling techniques.A collaborative mindset and willingness to work across disciplines.A passion for aerospace technology and a commitment to excellence.

About the RoleJoin the Controller team at Hex Technologies, where we are laying the crucial groundwork necessary to make our platform ready for enterprise-scale operations. You'll be instrumental in developing features related to authentication, authorization, security, compliance, public APIs, and auditability. As a valued member of this agile team, your work will span the entire technology stack—from crafting intuitive front-end experiences to building robust backend services. Your contributions will help empower some of the world’s leading organizations to confidently adopt our platform. You will also define technical standards for security, observability, and reliability, unlocking pathways for enterprise growth.A few exciting projects you might work on include:Designing seamless end-to-end solutions for user-based and role-based data access using OAuth mechanisms, fostering collaboration.Creating secure, developer-friendly public APIs that enable enterprise administrators to programmatically handle user provisioning, access management, and governance at scale.Developing powerful yet user-friendly admin workflows for permissions, auditability, and compliance, allowing IT teams to navigate complex organizational structures smoothly.What You Will DoIn this role, you can expect to undertake the following:Develop features such as claimed domains to support secure automated provisioning and identity governance across large enterprises.Design and implement an advanced access control system, including role-based access control (RBAC), request/approval workflows for administrators, and tiered admin roles that cater to complex organizations.Expose these capabilities through secure public APIs, empowering enterprise admins to weave provisioning, governance, and audit into their existing workflows.Oversee full-stack product changes from backend policy enforcement to admin-facing workflows, ensuring that enterprise features are intuitive, reliable, and secure.Collaborate with the wider Hex team to propose and implement designs for scalable, well-architected systems.

Why Choose Stand Insurance? At Stand, we are pioneering a new era in global property protection. Our innovative use of advanced physics and artificial intelligence enables us to model catastrophic risks at the asset level, automating underwriting and loss mitigation processes before they occur. While traditional insurance merely reacts to losses, we focus on creating a scalable risk engine that proactively addresses potential threats.We step in where conventional insurers retreat, providing precise modeling where others rely on approximations. Our systems are designed to drive impactful outcomes rather than simply adjusting pricing.About the Role: As the Simulation Platform Engineer, you will take ownership of and enhance the simulation and digital twin platform that supports Stand’s modeling workflows. This role encompasses the development and maintenance of production simulation pipelines, ensuring the reliability of our infrastructure and CI/CD processes, as well as managing geospatial data processing, annotation, and quality control systems. You will also contribute to the development of new digital twin capabilities that facilitate our expansion into various geographies and peril types, such as hurricanes.Collaboration is key in this role. You will work closely with Physics Simulation Engineers, Machine Learning Engineers, and subject matter experts specific to different perils, ensuring our simulation, AI, and geospatial pipelines are robust, observable, and scalable.This position is tailored for individuals who thrive in dynamic environments, take full ownership of projects, collaborate effectively across teams, and are inspired by the challenge of building innovative solutions from the ground up.

Join Sentry as a Senior Software Engineer specializing in the Control Plane, where you will play a pivotal role in enhancing our platform's capabilities. You'll collaborate with a talented team of engineers to design, develop, and maintain high-performance systems that empower developers to monitor and fix crashes seamlessly.