Senior AI Platform Engineer - Agentic Systems

<div class="content-intro"><p><span style="font-weight: 400;">Every day, tens of millions of people come to Roblox to explore, create, play, learn, and connect with friends in 3D immersive digital experiences– all created by our global community of developers and creators.&nbsp;</span></p> <p><span style="font-weight: 400;">At Roblox, we’re building the tools and platform that empower our community to bring any experience that they can imagine to life. Our vision is to reimagine the way people come together, from anywhere in the world, and on any device.</span><strong> </strong><span style="font-weight: 400;">We’re on a mission to connect a billion people with optimism and civility, and looking for amazing talent to help us get there.&nbsp;</span></p> <p><span style="font-weight: 400;">A career at Roblox means you’ll be working to shape the future of human interaction, solving unique technical challenges at scale, and helping to create safer, more civil shared experiences for everyone.</span></p></div><p>Join the AI Platform team at Roblox, where our mission is to create a cutting-edge AI/ML platform that powers some of the most innovative and widely used products in the world. As an AI Platform Engineer focused on Agentic Systems, you'll be at the forefront of building the critical backbone—Context Engineering with the Knowledge Graphs and Vector Databases, Platforms to execute and evaluate our agents.</p> <p>Your work will directly shape the Roblox experience for millions of users, empowering a new era of AI-driven creativity, safety, and connection. The core focus of this role is to engineer and scale the foundational data infrastructure that grounds and empowers all of Roblox’s AI applications.</p> <h2>Why This Role?</h2> <ul> <li>Unprecedented Scale: Your contributions will touch billions of users globally, driving innovation in gaming, learning, social connections, and creativity.</li> <li>Pioneer &amp; Builder: You will play a pivotal role in designing, building, and scaling our core AI infrastructure from the ground up.</li> <li>Cutting-Edge Technology: Work on complex, large-scale systems that push the boundaries of modern ML infrastructure, including Knowledge Graphs, Vector Search, and Agentic RAG systems.</li> </ul> <h2>You will:</h2> <ul> <li>Design, develop, and operate Knowledge Graph systems for serving, ingesting data, and executing graph queries at massive scale for critical ML applications (e.g., recommendations, fraud detection, safety, and social proof).</li> <li>Own and significantly improve our Vector Database infrastructure, scaling it to support 100B+ vector searches and ensuring high-performance, low-latency lookups.</li> <li>Build robust, highly available APIs and services to seamlessly integrate Knowledge Graphs and Vector DBs into new agentic and RAG (Retrieval-Augmented Generation) applications.</li> <li>Research, evaluate, and pioneer the adoption of the latest advancements in VectorDB technology, Knowledge Graphs, and Ground Truth Data labeling practices to define new industry standards.Develop comprehensive evaluation frameworks to measure agentic performance, safety, and reliability.</li> </ul> <h2>You have:</h2> <ul> <li>5+ years of professional experience designing, building, and operating large-scale distributed systems and production-grade ML infrastructure.</li> <li>Proven expertise in AI platform features, with a specific focus on ML Data Infrastructure.</li> <li>Deep understanding of the architectural challenges and solutions for highly performant Vector Databases (e.g., indexing, partitioning) and Knowledge Graphs (e.g., query languages, serving architectures).</li> <li>Bachelor’s degree in Computer Science, Engineering, Data Science, or a related technical field.</li> <li>A strong builder’s mindset, driven by a passion for pioneering AI platform innovation and delivering technology that connects people globally.</li> </ul><div class="content-pay-transparency"><div class="pay-input"><div class="description"><p>For roles that are based at our headquarters in San Mateo, CA: The starting base pay for this position is as shown below. The actual base pay is dependent upon a variety of job-related factors such as professional background, training, work experience, location, business needs and market demand. Therefore, in some circumstances, the actual salary could fall outside of this expected range. This pay range is subject to change and may be modified in the future. All full-time employees are also eligible for equity compensation and for benefits as described on <strong><a href="https://careers.roblox.com/total-rewards">this page</a></strong>.</p></div><div class="title">Annual Salary Range</div><div class="pay-range"><span>$227,370</span><span class="divider">&mdash;</span><span>$295,250 USD</span></div></div></div><div class="content-conclusion"><p>Roles that are based in an office are onsite Tuesday, Wednesday, and Thursday, with optional presence on Monday and Friday (unless otherwise noted).</p> <p>Roblox provides equal employment opportunities to all employees and applicants for employment and prohibits discrimination and harassment of any type without regard to race, color, religion, age, sex, national origin, disability status, genetics, protected veteran status, sexual orientation, gender identity or expression, or any other characteristic protected by federal, state or local laws. Roblox also provides reasonable accommodations to candidates with qualifying disabilities or religious beliefs during the recruiting process.</p> <p>For US based roles only, please note the Company may not be able to employ candidates for this role who have United States work authorization related to certain U.S. visa categories, or support future H-1B sponsorship at this time.</p></div>