[2026] Senior Machine Learning Engineer - Natural Language Processing (PhD Early Career)

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…

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.

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.

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.

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 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.

Roblox is a vibrant platform where millions of users come together to explore, create, play, learn, and connect in immersive 3D experiences crafted by a diverse global community of developers.At Roblox, we are dedicated to building innovative tools and a robust platform that empower our community to bring their imaginative experiences to life. Our vision is to transform how people unite, no matter where they are in the world or what device they use. We are on a mission to connect a billion individuals with optimism and civility, and we seek 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, and creating safer, more respectful shared experiences for all.Our engine's resource management and streaming systems are crucial for providing a seamless, stable, and responsive experience for Roblox users across a vast array of devices and network conditions. These systems collaboratively manage compute, memory, bandwidth, and rendering quality while delivering dynamic world content in real time as players interact with their environments. The challenges we face include highly dynamic environments, unpredictable user behaviors, and opaque signals stemming from device and OS limitations.This position offers a unique chance to lead the integration of machine learning into real-time engine optimization. You will develop the ML framework for predictive resource allocation and content fetching, transitioning from heuristic-based logic to adaptive, data-driven decision-making. Your contributions will directly influence stability, visual quality, responsiveness, and content delivery across billions of global play sessions.

At Roblox, millions of individuals engage daily to explore, create, play, learn, and connect with friends in immersive 3D digital experiences crafted by our global community of developers and creators.We are dedicated to building tools and platforms that empower our community to realize their imaginative experiences. Our vision is to transform how people connect from anywhere in the world and on any device. Our mission is to unite one billion people with optimism and civility, and we are seeking exceptional talent to help us 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 civil shared experiences for all.The Rights Manager and Content Suitability teams, part of our Safety Experience, are in search of a Senior Machine Learning Engineer.The Safety Experience organization develops tools and systems that empower Roblox users and creators to control their experiences while enabling moderators to uphold our community standards. Our focus includes education, intervention, visibility, and action.Our initiatives include:Monitoring and influencing user behavior for enhanced safety.Building scalable and efficient moderation platforms.Providing transparency and educational resources for parents and developers.Empowering users to manage their own safety.Allowing IP owners to manage their creations on Roblox.Delivering quick and accurate support through our Customer Care Chatbot.Your responsibilities will include:Implementing machine learning solutions for safety-focused systems.Promoting a culture of technical excellence and inclusivity.Breaking down long-term product requirements into actionable phases for continuous improvement.Designing and building large-scale machine learning models with billions of parameters, ensuring they are production-ready.Facilitating complex technical decisions with empathy and foresight.

At Roblox, our platform is home to millions of users who engage in exploration, creativity, gaming, learning, and connection through immersive 3D digital experiences crafted by a diverse community of developers and creators. We are dedicated to empowering our community with innovative tools and platforms that enable them to bring their imaginative ideas to life. Our vision is to transform the way individuals connect globally across devices. Our mission is to unite a billion people through positivity and respect, and we are in search of exceptional talent to help us achieve this goal.Joining Roblox means you will contribute to defining the future of human interaction, tackle unique technical challenges on a grand scale, and assist in creating safer, more respectful shared experiences for everyone.WHY DATA SCIENCE & ANALYTICS?The Data Science & Analytics team aims to enhance our speed, frequency, and insight in decision-making at scale by adopting a data-driven strategy for product development. We span a broad range of data disciplines, including analytical data engineering, product analytics, experimentation, causal inference, statistical modeling, and machine learning. Collaborating with product teams, we leverage our diverse toolkit to uncover new opportunities, impact product roadmaps, prioritize data products, and assess their effects on our community of players and developers.WHY GENERATIVE AI?Our mission is to empower Roblox Creators by integrating GenAI functionalities for millions of users while maintaining a strong commitment to safety, responsibility, and quality.As a Data Scientist, you will be pivotal in evaluating and optimizing user-facing GenAI systems (including text, image, video, 3D, and 4D). You will establish the metrics for assessing safety, responsibility, quality, and efficiency, employing techniques such as annotation analysis, experimental design, causal inference, model-based evaluations (like LLM-as-a-judge), optimization algorithms, and AI models to guide product decisions and enhance models.You Will:Develop Evaluation Frameworks: Create and implement robust evaluation systems for GenAI features (text, image, video, 3D, 4D) involving experimental design, dataset structuring, label reliability analysis, and more.

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.

Join Roblox as a Senior Software Engineer, specializing in Machine Learning Infrastructure. In this role, you will be a key player in designing and developing robust ML systems to enhance our gaming platform. You will collaborate with cross-functional teams to implement scalable solutions that elevate user experiences. Your expertise will directly influence the future of gaming at Roblox.

Join our innovative team at parspect as a Machine Learning Engineer, where you’ll be at the forefront of developing cutting-edge machine learning solutions. This is an exciting opportunity for an entry-level candidate eager to expand their skills in a dynamic and supportive environment.

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!

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, where millions engage daily in creating, playing, and discovering immersive 3D experiences crafted by a vibrant global community of developers. At Roblox, we empower our community with the tools and platforms to turn their imaginative concepts into reality. Our vision is to transform how people connect from anywhere in the world, across all devices. We are on a mission to unite a billion individuals through optimism and civility, and we are seeking exceptional talent to help us achieve this goal.At Roblox, your career will contribute to shaping the future of human interaction by addressing unique technical challenges at scale and enhancing shared experiences for all.As we lead the evolution of immersive entertainment with the ambitious aim of capturing 10% of the gaming market, we invite you to join us in overcoming challenges that enable AI-driven creation for a diverse global community while prioritizing innovation and safety.During this 12 to 16-week internship, you will take ownership of a project from ideation to experimentation, production, or publication, with potential opportunities for continued collaboration beyond the internship. Your project will tackle some of the most complex technical problems facing large-scale systems today, impacting over 112 million daily active users. You will work alongside top researchers, engineers, and PhD candidates from around the world, with the potential to contribute to publications in esteemed venues.Teams Hiring For This Role:Discovery: Design recommender and search systems that connect millions of experiences to users using generative modeling, LLMs, and multimodal content understanding.Economy: Enhance the machine learning framework that supports monetization, marketplace, and payment solutions, addressing challenges related to fraud, pricing, and personalization.Ads & Brands: Advance the integration of recommendation systems, ranking, and marketplace/auction theory to optimize the delivery of sponsored content.Safety: Develop scalable AI solutions for real-time safety and moderation utilizing LLMs, NLP, and computer vision to protect text, voice, and accounts.Engine: Innovate technology for our immersive 3D graphics and advanced...

Join Roblox as a Senior Machine Learning Engineering Manager and lead a dynamic team focused on developing cutting-edge machine learning solutions. In this role, you will be responsible for overseeing the design, implementation, and optimization of algorithms that enhance user experience and gameplay. Your leadership will guide the team in leveraging data to drive strategic decisions, ensuring our platform remains at the forefront of technology.

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.

Join Skydio, the foremost drone company in the United States and a pioneer in autonomous flight technology essential for the evolution of drones and aerial mobility. Our team is dedicated to leveraging expertise in artificial intelligence, top-tier hardware, and software development, alongside a commitment to operational excellence and customer satisfaction. We strive to empower a diverse range of drone users, from utility inspectors to first responders and military personnel.About the Role:As a PhD Autonomy Engineer Intern, you'll be at the heart of our operations, developing computer vision algorithms that enable our drones to perceive their environment. You'll collaborate with a world-class team of researchers and engineers, taking ownership of projects that significantly enhance our products' capabilities.We welcome interns throughout the year (Fall, Spring, Summer) to join our innovative program. This is an exceptional opportunity for those with a strong mathematical background and software development skills who aspire to contribute to the advancement of autonomy algorithms in real-world applications.Your Impact:Drive the rapid R&D of intelligent systems with unmatched autonomous capabilities.Explore, prototype, and evaluate new approaches to enhance our technology.Design and implement innovative features that deliver exceptional value to users.Analyze and measure the performance of vital software and hardware components.

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.