Senior Software Engineer - Bot Defense

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. 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. We’re on a mission to connect a billion people with optimism and civility, and looking for amazing talent to help us get there. 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. WHY SAFETY? At Roblox, we strive to connect a billion people with optimism and civility, and the Safety organization’s mission is to become the leader in civil immersive online communities. We systematically detect, remove, and prevent problematic accounts, content and behavior, and we make Roblox accounts secure and free from compromise. We cover a broad area of the tech spectrum, including machine learning, classifiers for 3D models, experimentation, automation, detection workflows, and AI-powered text filters. Aligned and partnering with product teams, we use this toolbelt to discover new opportunities, influence and shape the product roadmap and prioritization, build safety products, and measure the impact on our community of users and developers. In doing so, we keep Roblox safe, civil, and inclusive, and we foster positive relationships between people around the world. WHY BOT DEFENSE? Roblox is a prime target for automated scripts that cause harm to our users, and creators. Join our Bots and Spam team, where you will tackle the critical challenge of safeguarding the platform against sophisticated bot threats. While our current team Backend and ML engineers have made tremendous progress in improving our detection quality and mitigation efficacy, we have reached a critical inflection point. To move from reactive firefighting to a hardened, self-serve platform, we need the missing piece of our puzzle: you. We are seeking a founding Senior Full-Stack Engineer (Frontend focus) on the bot defense team, to strengthen our in-house Bot Defense solutions at Roblox. As a full-stack engineer on our team, you will bridge the gap between our advanced ML and backend solutions by building intuitive, scalable, and high-performance front-end user interactions to bring these defenses to life. You will have a direct impact on platform health, ensuring fairness for creators and players by staying ahead of evolving threats in a high-stakes, data-driven environment. If you are passionate about solving complex, high-impact problems in an adversarial landscape, this is the team for you. This isn't just a traditional coding role; it is a platform-building role. If you want to solve complex, high-stakes problems with a team that has already proven its ability to deliver major technical milestones, we want to talk to you. You will: The "Founding" Experience: You will have total autonomy to shape our frontend practices. As the first dedicated full-stack hire on the team, you will have the opportunity to drive and establish next-generation technical and quality standards for the team’s frontend stack. Visible Results: Develop high-quality, user-centric, and low-friction front-end solutions, applying an adversarial and data-driven lens to proactively address security vulnerabilities. Bridge the gap: Translate complex backend detection intelligence into intuitive, high-value interfaces. Build the ecosystem: Build a centralized platform to provide intuitive UX for the bot defense pod and access control options to various product teams within Roblox and to the wider creator community. Solve the toughest problems: Design, build, and deploy 0-1 secure, efficient, and reliable bot defense products, focusing on the user experience for bot detection and mitigation You Have: 4+ years of experience as a Fullstack Software Engineer. 2+ years of experience in front-end development of hands-on experience with UI scripting languages and modern frameworks, such as JavaScript, TypeScript, Lua, and React. 2+ years of experience in compiled backend languages such as Golang, Java, or C#. Equivalent experience or a BS in Computer Science, Applied Math, Physics, Engineering, Statistics, or another technical field. A strong focus on writing clear, readable, testable, and highly monitored code. A customer-first mindset demonstrated through exceptional cross-team collaboration and delivery. 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 this page . Annual Salary Range $196,750 — $243,290 USD Roles that are based in an office are onsite Tuesday, Wednesday, and Thursday, with optional presence on Monday and Friday (unless otherwise noted). 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. 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.