As a full stack Senior Software Engineer you'll help build Global Actions: the systems that make core actions work consistently across every surface and platform on Roblox. Your first focus will be the Affinity System, which powers how people save and organize the things they care about on Roblox: a unified affinity system covering Saves, Collections, and Wishlists, replacing today's fragmented Favorites experience. You'll work across the stack, from backend APIs and data models to cross-platform React based UI solutions. You Will • Design and build the backend APIs and services, covering collections, items, pagination, and batching, that power Saves, Collections, and Wishlists • Lead the migration from Favorites to Saved without losing user data, across web, mobile, desktop, console, and VR • Build user facing surfaces, including the Saved Library and Collections pages, in partnership with Product and Design • Design for privacy and safety, so users only see content and Collections they're allowed to view • Extend the system to new entity types as the platform grows You Have • 3+ years of experience building full-stack systems, including backend, APIs, and frontend applications at scale. • Experience with React, TypeScript/JavaScript or similar • Experience with data modeling for systems with complex relationships, such as privacy and visibility rules You Are • Systems thinker: strong understanding of client server architecture, data modeling, and API design at scale. • Analytical: tackles ambiguous problems, like moderation, eligibility, and migration edge cases, systematically. • Collaborative: thrives in cross functional environments and enjoys mentoring. 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).