Principal Software Engineer - Game Engine Systems at Roblox

Join Roblox, where millions of users engage daily to explore, create, and connect in immersive 3D digital experiences crafted by our dynamic global community of developers and creators.At Roblox, we are dedicated to providing the tools and platform that empower our users to bring their imaginative experiences to life. Our vision is to revolutionize how people connect from anywhere in the world and on any device. We aim to connect a billion individuals with optimism and civility, and we are seeking exceptional talent to help us achieve this goal.A career at Roblox means you will be shaping the future of human interaction, tackling unique technical challenges at scale, and working towards creating safer, more respectful shared experiences for all users.As a Principal Software Engineer in the Performance & Optimization pod within Studio, you will spearhead the architecture, design, and development of simulation, profiling, and debugging tools in Roblox Studio. Your contributions will enable creators to understand their experiences' performance across a diverse range of devices, from high-end PCs to mobile, empowering them to deliver high-quality content rapidly and confidently.You will:Design and implement intricate technical features end-to-end in our game engine and Studio UI that assist creators in comprehending and optimizing their experiences.Collaborate cross-functionally across teams and technology platforms to ensure the delivery of consistent, high-quality tools.Mentor engineers by exemplifying best practices, patterns, and strategies in technology.Enhance product quality through the promotion of automated testing and reliable systems.Contribute to creating the world's leading professional application for massively multiplayer game development.

About Us:At Fireworks AI, we are pioneering the future of generative AI infrastructure. Our cutting-edge platform provides unparalleled model quality with the fastest and most scalable inference capabilities in the industry. We have been independently recognized as the leader in LLM inference speed and are at the forefront of innovative projects like our proprietary function calling and multimodal models. As a Series C company valued at $4 billion, we are backed by premier investors including Benchmark, Sequoia, Lightspeed, Index, and Evantic. Our dynamic team of builders includes veterans from Meta PyTorch and Google Vertex AI, and we are driven by ambition and collaboration.The Role: We are seeking a talented Software Engineer specializing in Performance Optimization to enhance the speed and efficiency of our AI infrastructure. This role demands ownership of performance optimization across all system layers, from low-level GPU kernels to large-scale distributed systems. Your primary focus will be on maximizing the efficiency of our most demanding workloads, which encompass large language models (LLMs), vision-language models (VLMs), and next-generation video models.You will collaborate closely with teams in research, infrastructure, and systems to identify performance bottlenecks, implement innovative optimizations, and scale our AI systems to meet the real-world demands of production use cases. Your contributions will significantly influence the speed, scalability, and cost-effectiveness of some of the most advanced generative AI models globally.

About the RoleJoin our dynamic team, affectionately known as MBMB (More Big More Better), where you will play a crucial role in optimizing our training and on-robot inference stacks. We are seeking bold innovations that drive substantial improvements rather than incremental changes.Your Responsibilities Will Include:Maximizing GPU performance through innovative strategiesDeploying machine learning, hardware, and software modifications that yield significant advancementsEnhancing both inference and training stacks for optimal performanceIdeal Candidates Will:Possess proficiency in the latest machine learning techniques, particularly for training and inference optimizations within transformer and diffusion-based architecturesHave a relentless pursuit of ML optimizations across various domains, including CUDA kernels, ML architecture, frontend and backend network bottlenecks, CPU inefficiencies, NVLink, and communication protocols, as well as optimizations in libraries such as Torch, NumPy, and Python.

Join Roblox as a Principal Software Engineer, where you will be at the forefront of the gaming industry, developing innovative software solutions that enhance the user experience. You will collaborate with cross-functional teams to design, implement, and optimize systems that power our platform.

Join Roblox as a Principal Software Engineer specializing in Connections, where you will lead innovative projects that enhance user experiences across our platform. You will work collaboratively with cross-functional teams to design and implement scalable solutions that power millions of interactions on Roblox.

Roblox is a dynamic platform where millions of users engage in 3D immersive experiences, exploring, creating, learning, and connecting with friends—all made possible by our vibrant community of developers and creators.At Roblox, we are committed to empowering our community by providing innovative tools and platforms that transform their imaginative ideas into reality. Our goal is to redefine how people interact globally, across various devices. We aspire to connect a billion users with a spirit of optimism and civility, and we are seeking exceptional talent to help us achieve this vision.Joining Roblox means being part of a team that shapes the future of human interaction, tackling unique technical challenges at scale, and contributing to the creation of safe and respectful shared environments.Are you a seasoned engineer with a strong focus on reliability and scalability? We invite you to join our Reliability team at Roblox. In this crucial role, you will lead the transformation of our systems, ensuring they achieve top-tier performance, reliability, and efficiency. Collaborate with cross-functional teams to build a robust infrastructure that fuels our growth. If you have a proven record of addressing complex technical challenges, we want to connect with you. Join us in crafting the future of our platform and delivering unmatched value to our users.At Roblox, our ambitious vision aims for 1 billion daily active users, and we believe your expertise will be vital in propelling us toward that goal.

Every day, tens of millions of users engage on Roblox to explore, create, play, learn, and connect with friends in immersive 3D digital worlds—all crafted by our vibrant community of developers and creators. At Roblox, we are dedicated to building the tools and platform that empower our community to bring their imaginative experiences to life. Our vision is to transform the way people connect from anywhere in the world on any device. We are on a mission to unite one billion individuals with positivity and respect, and we are seeking exceptional talent to help us achieve this goal. A career at Roblox means playing an integral role in shaping the future of human interaction, addressing unique technical challenges at scale, and contributing to the creation of safer, more respectful shared experiences for everyone.As a Principal Software Engineer on the Compute Cell Lifecycle team, you will design, support, and enhance the infrastructure at Roblox while we expand our private cloud. The Cell Lifecycle's mission is to create and maintain a sustainable and dependable compute primitive across all backend environments (including all on-premises and public cloud data centers) for every Roblox engineer. Join us in creating, supporting, and evolving the infrastructure that manages millions of containers handling hundreds of millions of requests per second, thereby making a lasting impact on the company.Your Responsibilities:Develop and enhance a cell primitive for Roblox that supports the majority of Roblox’s compute workloads.Collaborate closely with other teams in Compute and across the organization to introduce new features, support new workloads, and define the appropriate cross-system APIs as we broaden the 'cells' footprint.Safely and efficiently manage a critical at-scale system.

About the Role Roblox is hiring a Principal Software Engineer focused on Compute Provisioning at our San Mateo, CA office. This role centers on building and improving the systems that power Roblox’s cloud infrastructure. Work closely with engineers and other teams to create and support scalable solutions for compute provisioning across the platform.

Join Roblox as a Principal Software Engineer in our Sharing team, where you will play a pivotal role in developing and enhancing our platform. This position offers the unique opportunity to work on cutting-edge technology that powers millions of users worldwide. You will collaborate with cross-functional teams to design and implement scalable solutions that improve user engagement and drive platform innovation.

Join Roblox as a Principal Software Engineer specializing in Data Engineering! We are looking for an innovative and experienced software engineer to lead data-driven projects that empower our users and enhance their gaming experience. In this pivotal role, you will architect and develop scalable data systems, ensuring high availability and performance. Collaborate with cross-functional teams to create solutions that meet the diverse needs of our community while driving technical excellence.

Roblox is a vibrant platform where millions of users engage daily to explore, create, play, learn, and connect with friends in rich 3D digital environments crafted by our diverse community of developers and creators.At Roblox, we are innovating the tools and platform that empower our community to bring their imaginative experiences to life. Our vision is to transform how people connect, from any corner of the globe, across any device. We are on a journey to unite a billion people with positivity and respect, and we are seeking exceptional talent to join us in this mission.Joining Roblox means you will have the opportunity to shape the future of human interaction, tackle unique technical challenges at scale, and contribute to creating safer, more civil shared experiences for everyone.As a Principal Software Engineer for Engine UI at Roblox, you will be integral in enhancing our state-of-the-art game engine, expanding the User Interface capabilities across the entire Roblox platform. This role will empower our game developers to create high-quality, performant UI that fosters meaningful interactions.

Join Roblox, where millions of users engage in creating, exploring, playing, and connecting through immersive 3D digital experiences. Our global community of developers and creators drives our platform forward.At Roblox, we are dedicated to building innovative tools and platforms that empower our community to transform their imaginative ideas into reality. Our vision redefines how people connect globally, across all devices, promoting a future where a billion individuals can engage with each other in a positive and civil manner. We are on the lookout for exceptional talent to help realize this mission.A career with Roblox means you will contribute to shaping the future of human interaction, tackle unique technical challenges at scale, and enhance the safety and civility of shared experiences for all users.The Roblox Storage team serves as the backbone of data for all platform experiences. As a Principal Software Engineer for Data Access, you will design and develop a next-generation managed OLTP data access layer optimized for extreme scalability, global availability, and robust security. Your role will involve architecting core infrastructure capable of handling hundreds of millions of queries per second while ensuring reliable, low-latency data access globally.You'll face large-scale, highly technical, and business-critical challenges: shaping foundational storage systems, enhancing platform-wide scalability and reliability, and providing strong technical leadership that elevates engineering quality across teams. This role requires deep innovation, a clear architectural vision, and a passion for distributed systems—revolutionizing how Roblox engineers build, access, and trust data at scale.Your responsibilities will include:Collaborating with Product, Engineering, and Security teams to establish long-term strategies and technical requirements for the Data Access platform.Leading the architecture, implementation, and operation of our storage Infrastructure-as-a-Service offerings, setting the engineering standards for scalability, reliability, and system fortification across teams.Enhancing and scaling our extensive distributed services operating 24/7, delivering features with urgency, cost efficiency, zero downtime, and high reliability.Creating and developing frameworks or tools to automate development, testing, deployment, and management practices.

At Roblox, millions of users engage in exploring, creating, playing, learning, and connecting with friends through immersive 3D digital experiences, all crafted by our vibrant global community of developers and creators.We are dedicated to building innovative tools and platforms that empower our community to transform their imaginative ideas into reality. Our goal is to redefine how people connect globally, regardless of their location or device. Join us on our mission to connect a billion individuals with positivity and respect, as we seek exceptional talent to help us achieve this vision.A career at Roblox means you'll be at the forefront of shaping the future of human interaction, tackling unique technical challenges at scale, and contributing to creating safer, more respectful shared experiences for all.As a Principal Engineer on the Collaboration team, you will report to the engineering manager, overseeing the architecture, design, and communication components of Roblox Studio. Your role will involve developing software that enhances collaboration among larger groups of developers and artists within the Roblox community. You will also spearhead the design and development of Roblox Studio and the associated cloud services. The ideal candidate possesses extensive experience with C++ and backend systems on a large scale, enjoys resolving complex software issues, and is passionate about mentoring fellow engineers.We firmly believe that collaboration and teamwork are essential for unlocking the full potential of creativity on Roblox. Join us in our mission to make collaboration in the metaverse efficient, social, and above all, enjoyable!

Every day, tens of millions of users engage with Roblox, exploring, creating, playing, learning, and connecting with friends through immersive 3D experiences crafted by a vibrant global community of developers and creators. At Roblox, we are dedicated to building the tools and platforms that empower our community to actualize their imaginative visions. Our mission is to transform how individuals connect across the globe, regardless of the device they use. We aim 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 influencing the future of human interaction, tackling unique technical challenges at scale, and contributing to safer, more respectful shared experiences for all.As a Principal Software Engineer, you will have the autonomy, opportunity, and comprehensive responsibility to assist in constructing a vital and intricate backend system that supports our community of game developers and experience creators within the Roblox ecosystem.The Creator Success Team plays a crucial role in establishing Roblox as the premier development platform for 3D social experiences, enabling our creators to deliver engaging content within our ecosystem. This encompasses services and solutions related to the Creator Hub, Developer Forum, and Creator Dashboard. You will be responsible for creating and managing mission-critical services within this interdisciplinary team.We pride ourselves on our fast-paced iteration and action-oriented mindset while maintaining a long-term vision. Exciting projects are on the horizon, including but not limited to:Developing ML-driven services and extensive data pipelines to enhance player insights and optimize monetization for creators.Creating a next-generation communication platform that equips creators with robust tools to manage player communities, organize virtual events, and gather player feedback.Building a cutting-edge remote configuration and experimentation platform to facilitate the growth of games with the highest concurrent users (CCU) worldwide.You will:Lead technical decision-making and guide the engineering team.Oversee engineering and development for our services and systems at a massive scale.Collaborate with cross-functional leaders to expand the boundaries of what is achievable.Self-organize and prioritize tasks effectively to drive project success.

Join Roblox as a Principal Software Engineer - Content Lifecycle, where you will lead the development and optimization of our content management systems. As part of our innovative team, you will work on cutting-edge technology that powers our platform and enhances user experience. Your expertise will contribute to designing robust solutions that manage the lifecycle of content effectively and efficiently.

At Roblox, we bring together millions of users daily to explore, create, play, learn, and connect with friends in 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 manifest their wildest imaginations. Our vision redefines how people connect from anywhere in the world, on any device. Join us on a mission to connect a billion individuals with positivity and courtesy, as we seek exceptional talent to help us achieve this goal.A career at Roblox means shaping the future of human interaction, tackling unique technical challenges on a massive scale, and contributing to the creation of safer, more civil shared experiences for all users.As our daily active user base expands at an unprecedented rate, we are pioneering the next generation of advertising in an immersive metaverse. Our team lies at the heart of the Roblox Ads ecosystem, delivering billions of impressions while providing the essential infrastructure that connects global brands with our extensive community of creators.We are on the lookout for a Principal Software Engineer to spearhead the technical strategy and execution for the Ads Experience team. This team manages the entire monetization experience, including Advertiser Experience (Roblox Ads Manager), Brand Experience (Brand Ads & Integrations), and Publisher Experience (Creator Monetization & Commerce).This position presents a foundational technical challenge that transcends conventional ad-tech. You will design the scalable backbone of our monetization system, championing the technical vision for our Ads Manager, immersive Brand Ads formats, and creator solutions, while integrating AI and balancing a three-sided marketplace economy in real time.

Join Roblox as a Principal Software Engineer specializing in Creator Collaboration, where you will be at the forefront of innovating and enhancing our platform for creators. You will lead initiatives that empower users to create engaging experiences, leveraging your expertise in software engineering to build scalable systems and foster collaboration among developers.

Join Roblox, where millions of users engage daily to explore, create, and connect in dynamic 3D environments crafted by a talented global community of developers. At Roblox, we're dedicated to building innovative tools and platforms that empower our users to bring their creative visions to life. Our mission is to reimagine how people connect from anywhere in the world on any device, fostering a community of positivity and civility.As a Principal Engineer on our Engine Networking Team, you will play a pivotal role in enhancing player experiences by ensuring seamless communication of game states. Your expertise in networking and asset loading will be crucial in delivering smooth, near-synchronous gameplay experiences, as you dive into various aspects of our game platform striving for real-time connectivity across Roblox.In this role, you will:Lead a talented team of engineers with over 8 years of industry experienceDemonstrate a deep understanding of game networking, with a keen interest in open-source technologiesBring experience in asset loading, rendering, and networking, ideally from a Game Engine/Studio background (Desirable)Exhibit exceptional systems-level C++ programming skills, with a fascination for CPU operations involving smart pointers, templates, and memory managementHave a meticulous approach to optimizing network exchanges, focusing on minimizing latency and maximizing efficiencyPossess an understanding of operating system interactions upon code executionWe seek candidates who have:Experience working on the core architecture of a multiplayer game engine, addressing challenges related to scalability, performance, latency, and throughput in client/server modelsEngaged with large-scale multithreaded distributed systems that connect millions of users globallyWorked across various devices supported by Roblox, including desktop, mobile, and console clients

Join Roblox, where millions engage daily to explore, create, play, learn, and connect through immersive 3D digital experiences crafted by a vibrant community of developers and creators.At Roblox, we are at the forefront of building innovative tools and platforms that empower our community to transform their imaginative ideas into reality. Our vision is to revolutionize how people connect globally, transcending geographical barriers and device limitations. We aim to unite a billion individuals with a spirit of optimism and civility, and we are seeking exceptional talent to help us achieve this mission.A career with Roblox means contributing to the evolution of human interaction, tackling unique technical challenges at scale, and fostering safer, more respectful shared experiences for all.As a pivotal member of Roblox’s database team, you will be instrumental in developing a next-generation, multi-tenant database platform that seamlessly scales and supports every online data workload at Roblox. In your role as a principal engineer, you will influence the architecture, design, and deployment of vital database capabilities that ensure our services remain fast, reliable, and efficient on a global scale. You will report to the Technical Director for Storage.Your Responsibilities:Innovate and implement new engine features—including indexing, storage formats, WAL and replication protocols, sharding, and enhancements to the query planner—to push the boundaries of latency, throughput, and availability.Advance the control plane to provide elastic scaling, autonomous healing, and zero-downtime schema or tenant transitions across global regions.Analyze and optimize critical code paths utilizing kernel-level tracing and advanced performance tools; spearhead systematic reductions in tail latency.Establish engineering best practices by leading design reviews, performance benchmarks, failure drills, and retrospectives following incidents.Automate processes: create frameworks for testing, CI/CD, rollout safety, observability, and autoscaling to ensure the platform operates autonomously at scale.Mentor and empower engineers, fostering deep expertise in database craftsmanship and sharing knowledge across Storage, Platform, and product teams.Engage with the open-source community—contributing upstream improvements and fostering collaboration.