Staff Mobile Security Engineer

Beast Industries runs mobile experiences at serious scale — across media, mobile gaming, and creator platforms — all generating signals and requests from clients we don't fully trust by default. We're looking for a senior security engineer to own the boundary between our mobile clients and backend services: the systems that determine whether a request, a session, or an account is legitimate.

You'll be the threat-modeling and systems-design owner for device attestation, account integrity, and server-authoritative detection/enforcement against bad actors — fraud rings, bot farms, credential stuffing, and abuse at scale. This is a build-and-lead role: you'll set technical direction, write production code, and grow a team around you.