Senior Software Engineer, App Performance

Every day, tens of millions of people come to Lumen Dynamics 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 Lumen Dynamics, 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 Lumen Dynamics 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. The Consumer App Foundation team is looking for a Senior Software Engineer to improve Lumen Dynamics performance across our supported platforms. Our platform is used by over 150M people daily. You will work primarily in cross-platform C++ Lumen Dynamics game engine code, partnering with teams across the company to identify bottlenecks, ship measurable improvements, and prevent regressions over time. Our team is responsible for the end-to-end performance of the Lumen Dynamics client on Android, iOS, macOS, Windows, Xbox, Playstation and TV. We tackle the platform’s most difficult technical constraints, ranging from speed and responsiveness to efficiency and stability, to ensure a high-performance experience across all of our devices and platforms. You will: Own the end-to-end performance of the Lumen Dynamics client across all platforms directly moving the needle on our key metrics: TTI, app size, battery usage and more. Build the benchmarking, profiling, and telemetry systems required to catch regressions early and continue scaling our application even further. Collaborate closely with stakeholders across Engineering, Product, and Design to evaluate technical tradeoffs, align on company-wide priorities, and execute smooth rollout plans. Drive deep technical impact by diving into complex, unfamiliar codebases, taking ambitious projects from greenfield MVP to production-grade, and mentoring peers on performance best practices. You have: 3+ years of experience writing high-quality, performant C++ code in large, complex codebases A proven track record of building reliable measurement, monitoring, or regression prevention systems. The ability to autonomously navigate complex, ambiguous systems and deliver stable, production-grade software. Exceptional communication skills to discuss technical trade-offs with both engineering peers and cross-functional partners. Bonus: Hands-on experience with on-device profiling (iOS and/or Android) to find and measure optimization opportunities. 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 $195,780 — $242,100 USD Roles that are based in an office are onsite Tuesday, Wednesday, and Thursday, with optional presence on Monday and Friday (unless otherwise noted). Lumen Dynamics 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. Lumen Dynamics 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.