Senior Principal Engineer, Systems - Plasma & Multi-Scale Simulation Scientist

Join ASM – Where Innovation Meets Collaboration!With over 55 years of pioneering technology, ASM stands at the forefront of innovation, shaping the future of advanced semiconductor devices. Our diverse team of more than 4,500 professionals from 70 nationalities drives advancements in key trends such as 5G, cloud computing, AI, and autonomous driving. We pride ourselves on our commitment to diversity, inclusion, and sustainability, striving to make a positive impact on the world. Our comprehensive development programs are designed to foster your growth, enabling you to push the boundaries of innovation. Position: Senior Principal Engineer, Systems (Plasma & Multi-Scale Simulation Scientist)The Simulation and Modeling Hub is looking for a Senior Plasma & Multi-Scale Simulation Scientist to enhance our plasma modeling capabilities. This pivotal role involves integrating plasma physics, surface chemistry, and feature-scale behavior to develop predictive, physics-based simulation workflows that support advanced semiconductor processes including PEALD, PECVD, ALE, and RIE.

About Marathon FusionAt Marathon Fusion, we are pioneering the engineering technologies essential for transitioning fusion from experimental stages to operational power plants. While many in the industry concentrate on developing new fusion devices, we are dedicated to creating practical systems that facilitate the deployment of fusion energy at a scale relevant to combat climate change.Our focus includes the development of critical fuel cycle technologies and plant-level systems that support stable isotope production, fuel cycle closure, and advanced blanket systems aimed at enabling both energy generation and the production of valuable co-products.Established in 2023, Marathon Fusion is committed to constructing the components and systems that will render fusion a practical, abundant, and reliable energy source for the 21st century.Culture at Marathon FusionWe cultivate a startup environment that demands focus, adaptability, and prioritization in a rapidly evolving landscape. Success in this setting requires exemplary proactive communication across various roles and backgrounds, the ability to foster and maintain trust among team members, and a commitment to continuous learning and skill development. We emphasize the importance of self-direction in each team member.

Role overview The Principal Research Scientist – Scaling at Databricks leads research projects that advance how the company’s data analytics platform handles large workloads. This San Francisco-based role focuses on designing and improving algorithms that enable efficient large-scale data processing and machine learning. Collaboration is central, with regular work alongside engineering, product, and research teams. What you will do Lead research to develop algorithms that scale for data analytics applications. Work with colleagues across engineering, product, and research to strengthen machine learning capabilities. Use deep expertise to shape the direction and architecture of the Databricks platform. Drive new ideas and solutions that influence the future of data science and analytics at Databricks. Location This role is based in San Francisco, California.

Focused Energy is at the forefront of the fusion energy revolution, dedicated to unlocking unlimited clean energy to responsibly fulfill the global energy needs of the future. Our innovative approach harnesses laser-induced inertial fusion, a highly efficient and clean power generation technology that promises a secure and scalable energy supply for generations to come.We are in search of a talented and motivated Optical Simulation Scientist to spearhead the development and application of cutting-edge computational tools designed to model the intricate optical and multiphysics dynamics of our high-energy laser systems. In this pivotal role, you will create high-fidelity digital representations that directly influence system architecture, component design, and experimental validation for the next generation of fusion laser drivers.Your contributions will be vital in establishing our digital twin environment — facilitating predictive optimization, accelerating design processes, minimizing experimental risks, and transforming advanced laser physics into a dependable, scalable energy infrastructure.

Join Cloudflare as a Principal Systems Engineer, Data, where you will lead innovative projects that enhance our data processing capabilities. You will work collaboratively with cross-functional teams to design, implement, and optimize systems that efficiently handle large-scale data. This role requires a deep understanding of systems engineering principles, strong analytical skills, and a passion for leveraging data to drive decisions. Your contributions will be pivotal in shaping the future of our data infrastructure.

We are on the lookout for a Principal Simulation Engineer to lead the design and development of a comprehensive aerial autonomy simulation stack at DoorDash Labs. In this hands-on leadership position, you will define and implement the simulation architecture that supports our autonomy development, validation, continuous integration and deployment (CI/CD) testing, and pilot training.As the technical authority on simulation, you will make key architectural decisions, develop essential components, and establish engineering standards. You will also build and mentor a small but talented simulation team while maintaining active involvement in implementation and system design.This role is perfect for someone with extensive experience in building simulation systems from the ground up, possessing a deep understanding of simulator internals, and eager to craft a world-class platform from scratch.

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.

Role overview Pinterest is seeking a Principal Engineer to join the Online Systems team, based in either San Francisco or Palo Alto. This position centers on designing and building scalable systems that serve millions of users. The focus is on enhancing user engagement and optimizing the performance of Pinterest's online platforms. What you will do Architect and develop large-scale applications built for high-traffic environments Collaborate with engineering, product, and design teams to deliver reliable solutions Lead technical decisions that influence the direction of Pinterest's online systems

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.

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.

Join Cloudflare as a Principal Systems Engineer specializing in Internet Protocol Communication (IPC). In this pivotal role, you will lead and innovate within our engineering team, playing a crucial part in enhancing our systems to support seamless communication over the internet. Your expertise will help shape our infrastructure and drive our mission to help build a better internet.

Join our dynamic team at Amgen as a Principal Scientist - Biotransformation in San Francisco. In this pivotal role, you will lead innovative research focusing on biotransformation processes, contributing to the development of cutting-edge therapeutics. Your expertise will drive scientific advancements and support our mission to improve the lives of patients worldwide.

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.

Join Cloudflare as a Principal Systems Engineer and play a pivotal role in shaping the future of our cutting-edge technology solutions. In this hybrid position, you will leverage your extensive expertise to design and implement innovative systems that enhance our service offerings.

At Scale AI, we are pioneering the advancement of artificial intelligence by offering essential, data-driven infrastructure for creating and implementing cutting-edge AI systems. We are seeking a Senior Forward Deployed Data Scientist/Engineer to design and develop sophisticated data solutions that address our clients' most intricate challenges. This position is ideal for a first-principles thinker who thrives in uncertain environments, is passionate about solving unique customer problems, and is committed to leveraging rigorous data science to achieve tangible business outcomes. You will engage with a diverse range of innovative, customer-oriented AI projects. Our team powers initiatives like TIME’s Person of the Year AI experience, where our technology has contributed to one of the most iconic features in media. Utilizing Scale's robust data infrastructure, you will create tailored evaluation frameworks, deploy specialized statistical models, and build data pipelines. Your contributions will significantly influence how AI generates measurable value in real-world applications for leading companies across various industries. You will gain exposure to the forefront of the Generative AI sector while collaborating directly with top enterprise organizations, including leaders in telecommunications, e-commerce, finance, education, publishing, insurance, and healthcare.

Role Overview The City and County of San Francisco's Department of Technology is hiring a Principal System Integration Engineer focused on enterprise systems with Python expertise. This position leads major integration projects that connect and enhance a wide range of internal systems. What You Will Do Design, develop, and implement integration solutions for enterprise systems Lead complex projects that require coordination across multiple platforms and teams Work closely with colleagues from different departments to solve technical challenges Improve system performance and reliability through thoughtful integration work Collaboration and Impact This role works at the intersection of technology and city operations. Projects often require input from diverse stakeholders and have a direct impact on how services run across the organization.

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.

Axon Enterprise develops devices and cloud software aimed at improving safety and justice. Teams value honesty, compassion, and diverse perspectives, working together to make a meaningful impact. The company encourages initiative and personal growth, recognizing the importance of each person’s contribution. Role overview The Principal Data Scientist will join the Office of the Chief Accounting Officer in San Francisco. This position blends technical data science work with strategic collaboration across finance and technology groups. A strong background in finance and accounting is required for success in this role. Main focus Half of the role involves building data analytics tools and pipelines, using AI to speed up large-scale projects such as mergers and acquisitions integration, ERP deployments, data remediation, and SOX compliance. The other half centers on partnering with Controllership, Finance Operations, FP&A, Internal Audit, and Technology to lay the groundwork for AI, automation, and audit readiness. Daily tasks will include using AI-assisted development tools, such as code generation and large language models. Key responsibilities Design and implement data analytics tools, automated validation frameworks, and dashboards to provide Finance Operations and Controllership with real-time insights into data quality across enterprise systems. Use AI to quickly prototype, test, and deploy these solutions. Collaborate with source-system owners in Revenue Operations, Procurement, Human Resources, and Engineering to address data issues at their source and improve upstream data integrity. Maintain data dictionaries, lineage documentation, and quality scorecards for core controllership data assets. Set and enforce standards for master data management (MDM). Work with the Chief Information Officer and IT to develop integration strategies that enable seamless data flow.

Join Databricks as a Principal Data Scientist and contribute to shaping the future of data analytics and machine learning. In this pivotal role, you will leverage your expertise to drive impactful projects, collaborate with cross-functional teams, and lead innovative research initiatives that enhance our product offerings. As a thought leader, you will utilize your extensive knowledge in data science to influence our strategic direction, ensuring our solutions remain at the forefront of technology.

About GustoAt Gusto, we are dedicated to empowering small businesses to flourish. Our comprehensive solutions encompass payroll, health insurance, 401(k)s, and HR, allowing business owners to concentrate on what they do best: serving their customers and mastering their craft. With teams located in Denver, San Francisco, and New York, we proudly support over 400,000 small businesses nationwide, while striving to cultivate a workplace that reflects and honors our diverse clientele. Discover more about our Total Rewards philosophy.About the Role:We are seeking an experienced and driven Principal Data Scientist with over 10 years of expertise to join our Product team. In this pivotal role, you will utilize your skills in experimentation, statistical inference, and causal analysis to influence strategic decision-making that propels our organizational success. The ideal candidate is a compelling data storyteller with robust statistical and programming capabilities, passionate about leveraging data to support small business growth.In this position, you will collaborate closely with our Product, Engineering, Design, Finance, and other Data teams to become an authority on your domain's data, establish and monitor key metrics to assess business performance, and analyze our Payroll, Benefits, and HR data to extract actionable insights. Additionally, you will adopt AI-assisted methodologies to enhance analysis efficiency, improve rigor, and broaden the dissemination of insights across Gusto.We have multiple senior Data Scientist roles available at this senior level, each concentrating on various critical business areas.Here’s what you’ll do day-to-day:Strategic Leadership: Develop the analytical strategy for a significant product or business segment. Pinpoint high-impact opportunities, set long-term objectives for measurement and experimentation, and synchronize executive stakeholders on data-driven initiatives.Execution Excellence: Drive the implementation of comprehensive analytical roadmaps that influence company strategy. Ensure alignment and uphold consistent analytical rigor and metric integrity across product domains.Scaled Impact: Beyond being an expert in statistical methods and fostering impact...