Spark powered AR experiences used by 1 billion people across the Facebook family of apps and devices last year alone. Behind all these sessions there is a novel AR platform optimized for resource constrained devices. We are looking for a Framework Architecture Engineer to drive bold technical investments around the core health of the Spark platform, from its device efficiency (binary size, battery, size, GPU/CPU utilization) to its reliability (crashes, startup). Experience with C, mobile apps at scale, performance/reliability optimizations and telemetry are a must. Knowledge of client-side graphics, computer vision and machine learning is preferred.