Principal Machine Learning Engineer - Embodied AI & Smart NPCs

At Roblox, we empower millions of users to explore, create, play, learn, and connect through immersive 3D digital experiences crafted by our vibrant community of developers.Our mission is to redefine human interaction globally, enabling creativity and connection across devices. Join us as we strive to connect a billion people with optimism and civility, and …

Roblox is a dynamic platform where millions engage daily to explore, create, and connect through immersive 3D experiences crafted by a vibrant global community of developers and creators.Our mission at Roblox is to empower individuals to bring their imaginative experiences to life, transforming how people connect from anywhere in the world and on any device. We are dedicated to fostering a community that champions optimism and civility, and we are actively seeking exceptional talent to join us on this journey.Joining Roblox means you will play a pivotal role in shaping the future of human interaction, tackling unique technical challenges at scale, and contributing to safer, more respectful shared experiences for users worldwide.Why Focus on Safety?At Roblox, our commitment is to connect a billion people with optimism and civility. The Safety organization is at the forefront of creating civil immersive online communities. We proactively identify, remove, and mitigate problematic content and behaviors, ensuring that Roblox remains a safe, inclusive, and civil platform that nurtures positive relationships globally.Why Safety AI Systems?As a Principal Machine Learning Engineer specializing in Safety AI Systems, you will be instrumental in defining the future of proactive moderation while making a significant social impact through innovative machine learning solutions. This role merges the technical authority of a Principal Engineer with the leadership of an Engineering Manager, addressing critical safety challenges.You will establish the 3-5 year technical strategy and architectural framework guiding how Roblox employs machine learning—from rapid text filtering to utilizing multimodal Generative AI—to address the most complex safety issues on the platform. Your leadership will shape the execution roadmap and technical planning, overseeing the launch of high-priority machine learning initiatives. You will set the standards for innovation in data quality, model robustness, and ethical deployment across the entire Content & Communication Safety ML division.Lead and expand a high-performing team of contributors, offering both strategic direction and hands-on mentorship to those responsible for the architectural evolution of our safety systems.

Join Moonlake, the forefront of AI technology for crafting immersive world simulations.Your Role: Design and train advanced embodied agents capable of perceiving their environment through vision, depth, and language; reasoning through memory and planning; and acting with precision in both continuous and discrete control.We are dedicated to fostering a collaborative, in-person team environment based in San Mateo, CA.

About Our TeamAt Genesis Molecular AI, we are a dedicated group of innovative drug hunters, deep learning researchers, and skilled software engineers, all striving to revolutionize biochemistry. Our mission is to harness the power of AI to discover and develop groundbreaking therapies for patients dealing with severe disorders.Our team is engaged in pioneering the development of foundational models for small molecule drug discovery, conducting essential research at the intersection of machine learning, physics, and computational chemistry. We engineer robust software systems that support extensive simulations and facilitate the training of generative and predictive AI models capable of learning from diverse molecular data, leveraging a powerful cluster of thousands of GPUs and tens of thousands of CPUs.About the PositionWe are in search of talented ML Infrastructure Engineers who are ready to take the lead in advancing our machine learning research agenda for generative modeling of molecular systems, a key component of our mission.In this role, you will spearhead the rapid evolution of our AI platform and infrastructure, unlocking unprecedented levels of performance, efficiency, and scalability. You will be responsible for constructing massively distributed training and inference pipelines, core MLOps tools and frameworks, as well as optimizing GPU operations to enhance the speed of ML models.Genesis fosters a collaborative and cross-functional environment, offering the opportunity to work closely with our exceptional engineers, researchers, and scientists.Your ResponsibilitiesLead engineering initiatives aimed at the continuous enhancement of our AI platform, focusing on the rapid development of scalable and resilient distributed infrastructure for ML training, inference, and evaluation.Facilitate model training and deployment across multiple clusters and cloud environments, with an emphasis on optimizing throughput and cost-effectiveness.Maximize the efficiency of ML models and various workloads regarding latency, throughput, and memory usage (e.g., through GPU performance engineering), pushing the limits of current hardware capabilities.Contribute to the long-term strategic vision for Genesis’ infrastructure platform.QualificationsWe are looking for engineers with a strong foundation in software development and a passion for machine learning, particularly in the context of infrastructure and distributed systems.

Join Roblox as a Principal Machine Learning Engineer specializing in Engineering Efficiency! In this pivotal role, you will leverage cutting-edge machine learning techniques to enhance our engineering processes and optimize performance. Collaborate with a team of talented engineers to deliver innovative solutions that drive productivity and efficiency across our platforms.

About Us:At Fireworks AI, we are pioneering the future of generative AI infrastructure. Our platform is recognized for delivering the highest-quality models with the fastest and most scalable inference capabilities in the industry. Proudly benchmarked as a leader in LLM inference speed, we are at the forefront of innovation with projects like function calling and multimodal models. As a Series C company valued at $4 billion, we are supported by prestigious investors including Benchmark, Sequoia, Lightspeed, Index, and Evantic. Our team comprises ambitious builders, many of whom hail from Meta PyTorch and Google Vertex AI.The Role:As an Applied Machine Learning Engineer, you will play a crucial role in bridging the gap between advanced AI research and practical applications. Your responsibilities will include developing, fine-tuning, and operationalizing machine learning models that deliver significant business value and enhance user experiences. This hands-on engineering position demands a blend of deep technical expertise and a strong customer-centric approach to create scalable AI solutions.Key Responsibilities:Customer Success: Collaborate with the Go-To-Market (GTM) team, including Account Executives and Solutions Architects, to ensure seamless integration and successful deployment of machine learning solutions.Demo / Proof of Concept (PoC): Develop and present engaging PoCs that showcase the capabilities of our AI technology.Application Build: Design, develop, and deploy end-to-end AI-powered applications customized to meet customer needs.Platform Features / Bug Fixes: Contribute to the internal machine learning platform by adding features and resolving issues.New Model Enablements: Integrate and enable new machine learning models within the existing platform or client environments.Performance Optimizations: Enhance the performance, efficiency, and scalability of deployed models and applications.Partnership Enablement: Collaborate closely with partners to facilitate joint AI solutions and ensure effective collaboration.

At Roblox, our platform allows millions of users to explore, create, and connect in immersive 3D experiences crafted by our diverse community of developers. Every day, players from around the globe engage in imaginative play and learning, and we are dedicated to empowering them with the tools they need to bring their visions to life.Our mission is to foster a connected world, inspiring a billion people to engage with optimism and respect. We are seeking exceptional talent to join us on this journey, shaping the future of human interaction and tackling unique challenges at scale to create safe, enjoyable shared experiences.As a Senior Machine Learning Engineer at Roblox, you will tackle complex problems using cutting-edge AI and machine learning technologies to innovate the experiences of our growing user community. We are looking for leaders in AI and ML to spearhead the development of cost-effective machine learning solutions, guiding the design of essential components for on-device ML operations. Your work will focus on enhancing model architectures, facilitating efficient deployment to cloud and client systems, and managing sophisticated tasks such as Generative AI model deployment. You will play a key role in optimizing architectures across a variety of compute devices, making the best use of available resources. Join us in our exciting journey!

Join Roblox as a Principal Machine Learning Engineer focused on enhancing reliability across our systems. In this pivotal role, you will leverage cutting-edge machine learning techniques to ensure the seamless performance and reliability of our platform. Collaborate with cross-functional teams to design and implement robust ML algorithms that enhance user experience and system functionality.

About zaimlerAt zaimler, we recognize that AI agents struggle to make decisions based on fragmented data. Today’s enterprise data is scattered across numerous systems, lacking shared context and structure, which contributes to the challenges faced in enterprise AI. As we transition from copilots to fully autonomous agents, we're establishing a revolutionary infrastructure layer to support this evolution.zaimler serves as the foundational context infrastructure for the agentic era. Our platform autonomously uncovers domain knowledge, maps intricate relationships, and equips AI agents with the semantic understanding necessary for precise operations at scale. Envision knowledge graphs that facilitate real-time inference, designed specifically for systems that require reasoning capabilities, rather than mere data retrieval.Founded by industry veterans Biswajit Das and Sofus Macskassy, zaimler is a small yet highly skilled team at the seed stage, collaborating with major enterprises across sectors such as insurance, travel, and technology. If you aspire to develop the infrastructure that will underpin the next decade of AI advancements, we invite you to join our journey.About the RoleWe are in search of a Senior Machine Learning Engineer to enhance our dynamic team, ideally based in the Bay Area or open to relocation. The perfect candidate will possess strong expertise in one or more of the following areas: Knowledge Extraction, Natural Language Understanding, Unsupervised Learning, Information Retrieval, and Fine-tuning Large Language Models (LLMs). In this pivotal role, you will be instrumental in developing and training the models, pipelines, and methodologies that drive our semantic graph systems. We seek an individual with a robust background in machine learning, natural language processing, LLMs, and semantic technologies, along with a proven history of managing complex, large-scale machine learning projects.

Every day, millions of users engage with Roblox to explore, create, play, learn, and connect in immersive 3D digital environments crafted by our vibrant global community of developers and creators.At Roblox, we are dedicated to developing tools and a platform that empower our community to bring their imaginative experiences to life. Our vision is to transform social interactions, enabling connections from anywhere in the world and on any device. We aim to unite a billion individuals through positivity and respect, and we are seeking exceptional talent to help achieve this goal.Joining Roblox means you will play a pivotal role in shaping the future of human interaction, tackling unique technical challenges at scale, and contributing to the creation of safer, more respectful shared experiences for all users.The Safety Experience team develops the tools and systems that empower Roblox users and creators to take charge of their interactions, while also equipping moderators to uphold community standards. Our focus areas include education, intervention, visibility, and action.Our priorities include:Monitoring and influencing user behavior (User Safety)Creating efficient and scalable moderation platforms (Foundation)Providing transparency and education for parents and developers (User Safety)Empowering users with tools to manage their own safety (User Safety)Enabling IP owners to maintain control over their creations on Roblox (Rights & Guidelines)Delivering prompt and precise support through our Customer Care Chatbot (Customer Care)Your responsibilities will include:Designing and building comprehensive ML systems for similarity detection, computer vision classification, and other innovative applications.Leading the evolution of our safety experience into a scalable, adaptable system that meets the diverse needs of multiple customer teams.Developing cutting-edge detection methodologies in a fast-changing environment. Employ a data-driven approach to creatively and strategically identify opportunities.Defining the team's roadmap and technical direction, ensuring robust execution, and mentoring junior engineers.Collaborating with AI Systems, Product Management, Data teams, and stakeholders across Roblox.

Every day, millions of individuals engage with Roblox to explore, create, play, learn, and connect with friends through immersive 3D digital experiences, all crafted by our vibrant global community of developers and creators. At Roblox, we are dedicated to creating the tools and platform that empower our community to bring any experience they can envision to life. Our mission is to transform how people connect from anywhere in the world, across any device. We aim to unite a billion individuals with optimism and civility, and we are looking for extraordinary talent to help us achieve this vision. Joining Roblox means you will play a key role in shaping the future of human interaction, tackling unique technical challenges at scale, and contributing to the creation of safer, more respectful shared experiences for all.Why Choose Content Safety?As the Lead Principal Machine Learning Engineer for Content Safety, you will define the future of proactive moderation, driving significant social impact through innovative machine learning solutions that address critical and complex safety challenges.You will develop the 3-5 year technical strategy and architectural framework for how Roblox implements machine learning for content moderation. You will be responsible for the architectural and execution roadmap of large-scale ML systems that prevent harmful user-generated content from affecting our community.Your work will involve a profound sense of responsibility as you proactively safeguard our community in a thoughtful and fair manner, balancing user freedom with platform civility. Your contributions will ensure Roblox remains one of the safest environments on the internet for our expansive community of over 100 million daily active users.Your Responsibilities:Establish and Drive the Technical Vision: Lead the development of the multi-year technical vision, architectural strategy, and implementation for machine learning solutions in Content Safety, ensuring these systems detect and mitigate harmful content at scale effectively.Strategic Collaboration: Partner with executive-level leaders in Product, Data Science, Policy, and Operations to outline and prioritize the strategic machine learning roadmap, influencing product strategy and demonstrating the impact of ML on user trust and safety.

Roblox is a dynamic platform where millions of users venture daily to explore, create, engage, and connect with friends in immersive 3D digital environments crafted by our vibrant community of developers and creators.At Roblox, we are dedicated to developing tools and platforms that empower our community to transform their imaginative ideas into reality. Our vision is to redefine global connectivity, enabling people to come together from anywhere in the world, accessible on any device. We are on a mission to unite a billion people with positivity and respect, and we are seeking exceptional talent to help us achieve this goal.A career at Roblox means you will play a pivotal role in shaping the future of human interaction, tackling unique technical challenges on a grand scale, and contributing to the creation of safer, more respectful shared experiences for all.The Foundation AI Group aims to position Roblox as the benchmark for 3D foundational models (3DFMs), making it easier for anyone to craft high-quality, immersive 3D experiences using AI. The AI Platform team is integral to this vision, managing hundreds of machine learning use cases and handling billions of inferences daily across areas like Discovery, Safety, and Engine. We are searching for exceptional PhD graduates to spearhead innovation in three vital areas: AI Platform, Distributed Inference Systems, and Generative AI Information Retrieval.Your RoleAs a Senior Machine Learning Engineer on the AI Platform team, you will be a vital contributor to the development of innovative systems that drive AI at Roblox. You will concentrate on one of three significant tracks:Track 1: AI Platform ProjectsLead the development of next-generation AI tools that improve the efficiency, cost, and usability of ML@Roblox.Build and sustain essential platform components: Serving Layer, Model Registry, Pipeline Orchestrator, and Training/Inference control planes.Craft outstanding developer experiences (templates, tools, visualizations) to reduce time-to-production and ensure foundational AI systems are scalable and reliable.Track 2: Distributed Inference & Systems OptimizationDesign and implement scalable distributed inference systems for efficiently serving large language models (LLMs) and Large Recommender Models at unprecedented scale.Perform in-depth, low-level performance analysis to optimize systems.

Roblox is a vibrant platform where millions of users engage daily to explore, create, play, learn, and connect through immersive 3D experiences, all crafted by our diverse community of developers and creators.At Roblox, we are dedicated to building innovative tools and platforms that empower our community to turn their imaginative experiences into reality. Our vision is to revolutionize how people connect from anywhere in the world, across any device. We are on a purposeful mission to unite a billion individuals with positivity and respect, and we are seeking exceptional talent to help us achieve this goal.Joining Roblox means contributing to the evolution of human interaction, tackling unique technical challenges at scale, and fostering safer, more respectful shared experiences for all.In the role of Distinguished Machine Learning Engineer/Technical Director within the Safety organization at Roblox, you will spearhead the technical vision and execution of machine learning projects aimed at ensuring user safety and promoting civility. Our top-tier safety features are what make Roblox a secure and inclusive space for creative expression and shared experiences. The Safety team plays a critical role in maintaining Roblox as one of the safest platforms on the internet, protecting users as our platform grows to accommodate diverse age groups and locations.You Will:Take ownership of the technical direction and implementation of machine learning solutions for safety systems.Lead and mentor fellow engineers, fostering an environment of technical excellence and inclusivity.Translate long-term product requirements into manageable milestones, ensuring ongoing enhancements.Design and develop large-scale machine learning models with billions of parameters, ensuring they are production-ready.Navigate complex technical decisions across teams, showcasing empathy and fostering mutual understanding.Work collaboratively with cross-functional teams to outline and prioritize the machine learning roadmap.

About the RoleAt Generalist, we are at the forefront of training expansive robot foundation models, leveraging cutting-edge GPU hardware, primarily from Nvidia, to execute distributed training tasks and experimental research. Our operations demand exceptional storage solutions and optimized data loading processes, necessitating the full utilization of cloud infrastructure alongside custom-built solutions.In this role, you will take charge of our inference infrastructure. Our robotic systems rely on a dedicated fleet of on-premises GPUs designed for demanding real-time computations and latency-sensitive applications within resource-constrained environments.Your Responsibilities:Manage and optimize our GPU compute fleets.Facilitate user-friendly access to GPUs for researchers, ensuring optimal utilization.Enhance ML data loading, transport, and storage systems in extensively utilized distributed environments.Oversee the orchestration of our robot inference fleets.You May Excel in This Position If You:Have experience managing large GPU fleets for large-scale, distributed training or inference.Possess significant expertise in using Slurm or Kubernetes for ML workload orchestration.Have developed high-scale ML data loaders and preparation systems.Understand the intricacies of ML hardware, storage, and networking systems.Are familiar with the Nvidia GPU ecosystem.

About the TeamBecome a part of a pioneering team at the intersection of artificial intelligence and biochemistry.At Genesis Molecular AI, we are a dynamic collective of distinguished deep learning researchers, software engineers, and innovators in drug discovery. Our ambitious mission is to develop the next frontier of AI foundation models to unlock revolutionary treatments for patients battling serious diseases.We are not merely applying machine learning to biological problems; we are engaged in groundbreaking research that bridges machine learning, physics, and computational chemistry, challenging the limits of each discipline. The Genesis AI team is constructing the engine for this transformation. You will collaborate closely with leading multidisciplinary researchers to design and implement generative and discriminative foundation models at scale, utilizing extensive computational resources and large-scale simulations.About the RoleThis is a unique opportunity for a scientific innovator to influence the future landscape of generative AI in drug discovery. As a pivotal member of the Genesis AI team, you will direct our research strategy for foundation models. You will spearhead critical research initiatives in areas such as reinforcement learning, innovative model architectures, and advanced pretraining and post-training techniques. Your primary goal will be to develop transformative models and insights that play a crucial role in the discovery of new medications.This position demands a profound curiosity and a commitment to collaboration. You will be an integral team player, partnering closely with our exceptional engineers and drug discovery specialists to realize complex concepts. Additionally, we encourage you to engage with the scientific community, and we will actively support your endeavors to publish significant research findings in prestigious ML conferences such as NeurIPS, ICML, and ICLR.We are hiring for various levels of seniority: Senior, Staff, and Principal.Your ResponsibilitiesLead innovative research projects from inception to execution, addressing fundamental challenges in generative modeling for molecular systems.Design and develop advanced models and algorithms, leveraging the latest advancements in diffusion models, flow matching, reinforcement learning, and large language models.Conduct large-scale experiments utilizing our premier computational resources to validate your research.

Join Our Innovative TeamAt Genesis Therapeutics, we are a dynamic and passionate group of drug discovery experts, deep learning researchers, and software engineers dedicated to revolutionizing biochemistry through AI. Our mission is clear: to uncover and develop transformative therapies for patients with severe medical conditions.Our AI team is at the forefront of creating foundational models for small molecule drug discovery. We conduct cutting-edge research that bridges machine learning, physics, and computational chemistry, while building resilient software systems capable of executing large-scale simulations and training advanced generative and predictive AI models utilizing our powerful cluster of thousands of GPUs and tens of thousands of CPUs.Your RoleWe are on the lookout for skilled ML infrastructure engineers to propel our machine learning research initiatives, particularly in generative modeling of molecular systems, which is vital to our overarching goals.In this position, you will spearhead the rapid advancement of our AI platform and infrastructure, enhancing performance, efficiency, and scalability to unprecedented levels. You will construct expansive distributed training and inference pipelines, essential MLOps tools and frameworks, and fine-tune GPU operations to accelerate ML model performance.Genesis fosters a collaborative and interdisciplinary environment, allowing you to work closely with our talented engineers, researchers, and scientists.Your ResponsibilitiesDrive engineering initiatives aimed at the continuous enhancement of our AI platform, focusing on the rapid development of scalable and robust distributed infrastructures for ML training, inference, and evaluation.Facilitate model training and deployment across various clusters and cloud environments, optimizing for throughput and cost-effectiveness.Maximize the efficiency of ML models and other workloads in terms of latency, throughput, and memory usage, particularly through GPU performance engineering, pushing the boundaries of current hardware capabilities.Contribute to the long-term strategic vision for Genesis’ infrastructure platform.Your ProfileA strong engineering background with a focus on machine learning infrastructure.

About ZaimlerAt Zaimler, we believe that AI agents need a profound understanding of data to operate effectively. In today’s fragmented enterprise data landscape, where information is scattered across various systems without a unified context, traditional AI solutions often fall short. We are pioneering the transition from basic copilots to fully autonomous agents, creating a revolutionary infrastructure layer that makes this transition possible.Our platform serves as the foundational context infrastructure for the agentic era. We automatically uncover domain knowledge, establish meaningful relationships, and endow AI agents with the semantic comprehension necessary for precise operations at scale. Imagine knowledge graphs that not only facilitate real-time inference but are also designed for systems that require reasoning capabilities beyond mere retrieval.Founded by industry veterans Biswajit Das, former VP of Engineering at Truera and Chief Architect at Visa, and Sofus Macskassy, ex-Director of Engineering at LinkedIn and creator of one of the largest production knowledge graphs, Zaimler is a close-knit, senior team currently in the seed stage. We are collaborating with major enterprises across sectors such as insurance, travel, and technology. If you are passionate about shaping the infrastructure that will power the next decade of AI innovation, we would love to connect with you.About the RoleAs part of our Machine Learning team, you will focus on transforming raw enterprise data into structured, contextualized knowledge graphs and embeddings. Your responsibilities will include developing innovative and scalable algorithms for machine learning and data engineering aimed at enhancing system efficiency. You will also explore new methodologies to compress large models into more efficient versions, improve retrieval and reasoning performance through feedback mechanisms, and prototype techniques that enable large language models (LLMs) to extract and utilize real-world knowledge efficiently.We seek a candidate who thrives in a fast-paced environment, values meticulous work, and is eager to learn from some of the top engineers and researchers in the field.

Every day, millions of users engage with Roblox to explore, create, play, learn, and connect within vibrant 3D digital environments crafted by our diverse global community of developers and creators.At Roblox, we are dedicated to building tools and a platform that enable our community to turn their imaginative experiences into reality. Our vision is to transform how people connect, from any location around the globe, across any device. We are on a mission to unite a billion individuals with positivity and respect, and we are searching for exceptional talent to help us achieve this goal.A career at Roblox means participating in the evolution of human interaction, tackling unique technical challenges on a grand scale, and contributing to creating safer, more respectful shared experiences for all.WHY SAFETY?At Roblox, our commitment is to connect a billion people with optimism and civility. The Safety organization is dedicated to leading the way in fostering civil immersive online communities. We employ systematic strategies to detect, eliminate, and prevent harmful accounts, content, and behavior, ensuring that Roblox accounts remain secure and uncompromised. Our expertise covers a wide array of technological domains, including machine learning, 3D model classification, experimentation, automation, detection workflows, and AI-driven text filtering. Collaborating closely with product teams, we leverage our toolset to uncover new possibilities, influence product development, and enhance safety features while measuring their impact on our community of users and developers. This work is essential in maintaining Roblox as a safe, civil, and inclusive space, promoting positive interactions among individuals worldwide.WHY ALT DEFENSE?Safety and civility are our top priorities at Roblox. The Alt Defense team is at the forefront of this initiative, tasked with addressing one of the most challenging adversarial issues on our platform: Alternate Account Detection and Prevention. When malicious users are banned from Roblox, they often attempt to return under new identities. Our mission is to thwart these attempts immediately. As the Technical Lead for this team, you will design and implement a cutting-edge detection system operating at an enormous scale—analyzing billions of accounts and identifying repeat offenders within minutes. Additionally, you will support various use cases for alternate account detection throughout the organization. You will report directly to the Senior Engineering Manager of the Account Identity Team.

Join Roblox as a Principal or Senior Machine Learning Scientist in our Search and Discovery team, where you will harness your expertise in machine learning to enhance user experience and drive innovative solutions. Your contributions will directly impact how users discover and interact with content on our platform.

Roblox is a dynamic platform where millions engage daily to explore, create, and connect within immersive 3D digital experiences crafted by our global community of developers and creators.We are dedicated to building tools and a platform that empower our community to transform their imaginative ideas into reality. Our vision aims to revolutionize the way people connect, enabling interactions from anywhere in the world and on any device. Our mission is to connect a billion people with positivity and respect, and we are in search of exceptional talent to help us achieve this goal.Joining Roblox means you will be at the forefront of shaping the future of human interaction, tackling unique technical challenges at scale, while enhancing safety and civility in shared experiences for everyone.As the number of daily active users on Roblox continues to surge, we are looking for skilled machine learning engineers who excel in solving complex problems and designing scalable, innovative solutions. In this pivotal role, you will create deep learning models for our performance advertising business, establishing the groundwork for effective ads that benefit our users and deliver significant value to our advertisers.You'll be tasked with developing cutting-edge machine learning solutions that enhance ad ranking algorithms and create personalized advertising experiences. As our advertising system is still evolving, this role presents a unique chance to shape and build a world-class ML-driven advertising platform from the ground up.