Principal Machine Learning Engineer - Communication Safety

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.…

Every day, millions of users engage with Roblox, diving into immersive 3D experiences crafted by our vibrant global community of developers and creators.At Roblox, we empower our community with innovative tools and platforms that bring their imaginations to life. Our mission is to transform how people connect from anywhere, on any device, fostering a world of optimism and civility. We are seeking exceptional talent to help us reach our goal of connecting a billion people.Embarking on a career at Roblox means shaping the future of human interaction, tackling unique technical challenges at scale, and creating safer, more respectful shared experiences for all.As our Ads business rapidly expands, we are developing a large-scale machine learning infrastructure aimed at delivering impactful performance ads to our user base and substantial value to our advertisers.In the role of Senior Machine Learning Infrastructure Engineer within our Ads ML Infra team, you will design and implement scalable, reliable, and high-performance infrastructure that underpins machine learning systems throughout our organization. You will work with vast datasets, handling hundreds of billions of engagements while redefining how we deliver performance ads to millions.

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.

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.

Every day, tens of millions of users engage with Roblox to explore, create, play, learn, and connect with friends through immersive 3D digital experiences crafted by our global community of developers and creators. At Roblox, we are developing the tools and platform that empower our community to bring any experience they can envision to life. Our mission is to transform the way individuals connect, from anywhere in the world, and on any device. We aspire 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 contribute to the future of human interaction, tackle unique technical challenges at scale, and help foster safer, more respectful shared experiences for all.As a Senior Machine Learning Engineer on the Economy ML team, you will develop models that enhance ranking, personalization, pricing, and optimization across Roblox’s economic ecosystems, including the Marketplace, Developer Monetization, and Payments. Your contributions will significantly influence how users find virtual items, how creators earn revenue, and how the platform evolves sustainably.The Economy ML team is constructing the machine learning foundation for Roblox’s virtual economy—from smart pricing and personalized storefronts to dynamic layout optimization and understanding avatar content. We closely collaborate with Marketplace, Payments, and Developer Monetization teams to create ML systems that drive long-term value across engagement, retention, and creator earnings.Your Responsibilities:Translate vague product challenges into actionable designs and deliver end-to-end ML solutions for ranking, recommendation, pricing, and content comprehension across economic platforms.Construct and refine deep learning retrieval and ranking models that personalize item and widget ordering across the Marketplace and other shopping interfaces.Create models and policies that optimize pricing, conversion, and revenue while maintaining ecosystem health, enhancing user experience, and ensuring creator success.Oversee the complete ML lifecycle for your projects: data exploration, feature engineering, model design, training, evaluation, and production deployment on Roblox’s ML platform.Design and execute robust testing frameworks to validate model performance and business impact.

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 play a vital role in shaping the future of digital interaction.As a Principal Machine Learning Engineer on the Creator Services Machine Intelligence team, you will lead the research and development of innovative Embodied AI and Behavioral Agents, transforming how games are conceptualized and played on Roblox. This role will bridge cutting-edge research with practical, large-scale applications, enabling sophisticated AI agents capable of dynamic 3D gameplay and enhancing user experience through features like automated playtesting and Smart NPCs that mimic human-like movement and strategic reasoning.In this position, you will engage with Imitation Learning (IL), Reinforcement Learning (RL), Computer Vision, Computer Graphics, Robotics, and Agentic Reasoning to develop adaptable agents that comprehend 3D environments, grasp game rules, formulate long-term strategies, and perform intricate physics-based actions.

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.

Join the vibrant world of Roblox, where millions of users engage in limitless exploration, creativity, and social interaction through immersive 3D digital experiences, all crafted by our dynamic global community of developers and creators.At Roblox, we are dedicated to constructing the tools and platform that enable our community to transform their imaginative ideas into reality. Our mission is to revolutionize how individuals connect, regardless of their location or device. We aim to unite a billion people with hope and respect, and we are seeking exceptional talent to join us on this journey.A career at Roblox means playing a pivotal role in shaping the future of human interaction, tackling unique technical challenges at scale, and fostering safer, more respectful shared experiences for all.Who We Are:Help shape the future of Roblox’s virtual economy.The Economy ML team is at the forefront of developing the machine learning infrastructure that drives Roblox’s Marketplace, Developer Monetization, and Payments systems. Our initiatives include intelligent pricing strategies, personalized storefronts, dynamic layout optimization, and enhanced avatar understanding, all designed to transform user engagement, monetization, and creator success on a grand scale.As a Principal Software Engineer (Data Systems), you will be responsible for architecting, building, and deploying robust, high-scale real-time and batch data systems aimed at enhancing personalization, search, and recommendation functionalities across Marketplace, Developer Monetization, and Payments products. You will contribute to crucial data projects, from designing event taxonomies and logging interfaces to real-time feature serving across various search and recommendation platforms.Your ResponsibilitiesLead data engineering efforts for the Economy ML team, establishing standards for batch versus streaming feature pipelines, table design, observability, and documentation across the Economy division.Actively engage as a hands-on contributor to our data systems, driving content recommendation, search, and personalization across Economy product surfaces.Collaborate with Product, Data Science, and ML engineering teams to prioritize data initiatives that align with key business objectives and mitigate technical debt in existing datasets and pipelines.Guide and mentor fellow DE/ML engineers on best practices for schema design, client logging, and more.

Join Roblox as a Senior Machine Learning Engineer specializing in Content Suitability! This unique opportunity is designed for early-career PhD graduates who are eager to apply their expertise in machine learning to enhance user experience and content moderation on our platform. Collaborate with a talented team of engineers and data scientists to develop innovative solutions that ensure a safe and engaging environment for our users.

Roblox seeks a Senior Machine Learning Engineer to shape the future of immersive gaming from its San Mateo, CA headquarters. This position centers on developing and fine-tuning machine learning models that enhance user engagement and interaction across the Roblox platform. Role overview This role involves designing and implementing machine learning solutions that directly impact how millions of players experience Roblox. The work supports features and systems that drive user participation and enjoyment on a global scale. Impact Projects in this position reach a vast audience, influencing the daily experiences of players worldwide. The Senior Machine Learning Engineer will play a key part in advancing the platform’s capabilities and supporting continued growth in user engagement.

Join Roblox, where millions of users engage daily in immersive 3D experiences crafted by our vibrant community of developers and creators.At Roblox, we are committed to empowering our community with innovative tools and a platform that brings their imaginations to life. Our vision is to transform how people connect globally, regardless of location or device. Our mission is to unite a billion individuals with positivity and respect, and we are in search of exceptional talent to help us achieve this goal.A career at Roblox means you will be at the forefront of shaping the future of human interaction, tackling unique large-scale technical challenges, and contributing to the creation of safe and respectful shared experiences for all.WHY DATA SCIENCE & ANALYTICS?The Data Science & Analytics team is dedicated to enhancing our decision-making speed, frequency, and insight by embedding a data-driven approach into product development. We span a broad range of data disciplines, including analytical data engineering, product analytics, experimentation, causal inference, statistical modeling, and machine learning. By collaborating with various product verticals, we leverage our comprehensive expertise to identify new opportunities, influence product roadmaps, build data products, and assess their impact on our community of players and developers.WHY DISCOVERY EXPERIENCES?We are looking for senior data scientists with a strong background in machine learning to join our Discovery Experience team. As influential individual contributors, you will spearhead strategic initiatives focused on user growth and product innovation, utilizing a variety of data science methodologies (analytics, experimentation, forecasting, and machine learning) to enhance consumer journeys on Roblox. This role will primarily concentrate on Discovery Experiences, including critical surfaces such as home, search, matchmaking, and notifications, which foster engagement and long-term relationships on our platform. The intricate dynamics of our two-sided marketplace, along with the rapidly evolving metaverse, present thrilling challenges.This position will report directly to the Senior Director of Data Science (Consumer) and will be located at our San Mateo, CA headquarters (hybrid work model, onsite Tuesday to Thursday).

At Roblox, millions of users engage daily to explore, create, play, learn, and connect within immersive 3D digital experiences crafted by our vibrant global community of developers and creators.We are dedicated to building innovative tools and platforms that empower our community to actualize any experience they envision. Our mission is to revolutionize the way people connect from anywhere in the world, regardless of the device they use. We aim to unite a billion people with positivity and respect, and we are in search of extraordinary talent to help us achieve this goal.Embarking on a career at Roblox means you will be instrumental 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 everyone.As a Senior Machine Learning Engineer focusing on Recommendation Systems, you will play a pivotal role in enhancing user retention, engagement, and monetization for our vast user base. This position presents a remarkable opportunity to transform how users search and discover captivating immersive experiences and digital avatars within our Marketplace, as well as personalize advertising. You will address a wide array of high-scale ranking, retrieval, and personalization challenges across our platform.We integrate pioneering research—including deep learning, generative AI, and reinforcement learning techniques—with large-scale engineering to bridge the gap between experimentation and production. You will design algorithms that operate at a massive scale, shaping the future of recommender systems for user-generated content.

Join Roblox as a Senior Machine Learning Engineer in the Account Identity team, where you will leverage your expertise in machine learning to enhance user experiences and security. You will collaborate with a talented group of engineers and researchers to develop innovative solutions that contribute to the growth and safety of our platform.

Every day, millions of users engage with Roblox, immersing themselves in an expansive world of creativity, learning, and connection through 3D digital experiences crafted by our diverse community of developers and creators.At Roblox, we are dedicated to developing the tools and platform that enable our community to turn their imaginative visions into reality. Our mission is to revolutionize how individuals connect, irrespective of their location or device. We strive to unite a billion people with positivity and respect, and we are actively seeking exceptional talent to join us on this journey.A career at Roblox means you will be at the forefront of shaping future human interactions, tackling complex technical challenges at scale, and contributing to the creation of safer, more respectful shared experiences for all.Natural Language Processing (NLP) plays a crucial role in facilitating extensive communication, creation, and safety across the Roblox platform. This position offers an exciting opportunity to develop and implement state-of-the-art NLP, speech, and generative AI models that function on an unprecedented scale, impacting hundreds of millions of daily users.You will address a remarkably diverse array of high-scale language challenges—from real-time moderation of voice and text to automating experience localization and empowering users with LLM-driven creation tools. Our approach merges cutting-edge research with large-scale engineering to connect experimentation and production, designing algorithms that will define the future of language services for our immersive, user-generated content platform.Teams Hiring for This RoleSafety AI Systems: Focused on creating comprehensive ML systems to uphold community standards and safety across our platform at massive scale. This includes:Real-time Moderation: Developing top-tier NLP and speech models for real-time moderation of voice and text (handling over 6 billion messages daily) and innovative interventions that significantly enhance user civility.Critical Harms & Advanced Detection: Crafting specialized LLM agents, behavioral analysis, and graph systems aimed at identifying and preventing rare, high-risk situations (e.g., child safety, terrorism), which necessitate adversarial thinking.

Skydio stands at the forefront of the drone industry in the United States and is recognized globally for its cutting-edge autonomous flight technology, which is pivotal for the advancement of drones and aerial mobility. Our team merges profound knowledge in artificial intelligence with superior hardware and software development, operational excellence, and an unwavering commitment to customer satisfaction. We aim to enable a wider and more diverse audience of drone users, ranging from utility inspectors to first responders and military personnel in various scenarios.About the Role:We are seeking a Staff Technical Recruiter to play a vital role in assembling the teams that are defining the future of autonomous flight. In this position, you will drive essential engineering searches, collaborate directly with organizational leaders, and significantly influence our hiring processes as we expand. This senior, hands-on recruiting opportunity is perfect for an individual who excels in dynamic environments and possesses the skills to attract top-tier technical talent.PLEASE NOTE: Skydio operates under a hybrid work model, with teams working in-office three days a week. This position will be located at our headquarters in San Mateo, CA.Your Impact:Act as a strategic recruiting partner to senior engineering leaders, shaping organizational design, headcount planning, and recruitment strategies.Manage end-to-end talent acquisition strategies and execution for one or more of our core engineering divisions.Develop and fine-tune diverse, high-performing talent pipelines for specialized skill sets in emerging technology sectors.Lead executive-level recruitment efforts from initial discussions to successful closure, ensuring a top-notch candidate experience at every stage.Collaborate with People Operations, Compensation, and Finance to streamline headcount planning and recruitment processes for scalability and efficiency.Promote structured hiring methodologies, maintaining rigor and fairness in all recruitment decisions.Mentor fellow recruiters, sharing insights and best practices to enhance Skydio’s recruiting culture and continuously elevate our talent attraction and retention strategies.Your Qualifications:Extensive experience in recruiting within at least two of the following areas: Cloud, Mobile, Infrastructure, Embedded, Wireless, Camera/Optics, or Hardware Engineering.Demonstrated success in building technical teams at high-growth or impactful technology organizations.Strong ability to thrive in fast-paced environments and deliver results.

Every day, millions of users engage with Roblox to explore, create, play, learn, and connect with friends through immersive 3D digital experiences, all developed by our vibrant global community of creators.At Roblox, we're crafting tools and platforms that empower our community to bring their imaginative concepts to life. Our vision is to transform how people connect from anywhere in the world on any device. We're on a mission to unite a billion individuals with optimism and civility, and we are seeking exceptional talent to help us achieve this goal.A career with Roblox means you will help shape the future of human interaction, tackle unique technical challenges at scale, and contribute to creating safer, more respectful shared experiences for all.In this role, you will leverage computer vision and graphics technologies to enhance how our global community discovers, creates, and interacts within our virtual platform. You will be responsible for developing advanced models to interpret and analyze various content forms—experiences, text, images, videos, and 3D avatars. Your contributions will significantly impact core systems driving the next generation of creation, search, recommendations, and trust & safety initiatives across our expansive ecosystem.We are in search of PhD candidates who are enthusiastic about the convergence of computer vision, graphics, and generative modeling. You will engage in applied research and engineering projects with tangible production impact, enabling innovative ways for creators and players to realize their ideas.

About UsAt Dyneti, we are committed to ensuring that digital payments are both seamless and secure. We have developed DyScan, an innovative software library that empowers digital merchants to prevent fraud while enhancing conversion rates by simply taking a photo of a credit card.Founded by a fraud prevention specialist from Uber, Dyneti has secured backing from a distinguished group of investors, including Y Combinator. Our technology has facilitated the processing of hundreds of millions of credit card scans globally, serving a diverse clientele that includes Fortune 100 companies and rapidly growing tech unicorns.Job OverviewWe invite you to join Dyneti as a member of our founding engineering team. This is a unique opportunity to work closely with our CEO in developing new features and launching innovative products within the deep learning domain.

About the Role IXL Learning is searching for a Senior Technical Recruiter to join the team in San Mateo, CA. This position focuses on sourcing and engaging skilled candidates for technical roles across the company. The recruiter will work side by side with fellow recruiters and hiring managers to attract individuals who fit IXL Learning’s mission and culture. What You Will Do Proactively identify and reach out to qualified technical talent Build and maintain strong relationships with hiring managers to understand their needs Guide candidates through the recruitment process from initial contact to offer acceptance Collaborate with the recruiting team to develop effective hiring strategies What We Look For Experience recruiting for technical positions Strong verbal and written communication skills Attention to detail and strong organizational habits Ability to manage candidate pipelines and deliver a positive experience Skill in partnering with hiring managers throughout the hiring process Work Location and Schedule This is a full-time role based at IXL Learning’s headquarters in San Mateo, CA. The schedule runs Monday through Friday, with the option to work from home one day each week.

Join Genesis Molecular AI as a Staff Technical Recruiter and play a pivotal role in shaping our team by identifying and attracting top talent in the tech industry. You will be responsible for managing the end-to-end recruitment process, collaborating with hiring managers, and ensuring a smooth candidate experience.