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# Staff Mobile Security Engineer

- **Company:** MrBeastYoutube, LLC
- **Location:** United States
- **Experience:** Expert
- **Contract:** Permanent contract
- **Skills:** Amazon Web Services, Mobile Security, Backend, Production Code
- **Published:** November 8, 2026
- **Apply:** https://www.juju.com/job/28_25303_bd8cf8edba0dcc865e8f3cd6ff20faa3

## About the Role

* 8 to 10+ years in security engineering, with deep experience defending consumer-scale mobile products (hundreds of millions of users/sessions a plus) against account takeover, bot abuse, and fraud
 * Proven ownership of an end-to-end security domain - not just tooling, but the roadmap, the team, and the outcomes
 * Strong systems design instincts: you've built server-authoritative detection pipelines, attestation systems, or similar adversarial-facing infrastructure at scale
 * Hands-on across native mobile (iOS/Android) client internals and the distributed backend services they talk to - you understand both sides of the trust boundary
 * Comfortable operating in Go (or similar) on a major cloud provider (AWS preferred); platform reliability and cost discipline are part of how you think about security, not an afterthought
 * Experience leading engineers (formally or as a tech lead) across disciplines

## Description

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.

What You'll Own

 * Device & session integrity - attestation, session enforcement, and authentication hardening across native mobile clients and the backends behind them
 * Abuse & fraud defense - design and run detection/enforcement systems that stay ahead of adversarial, adaptive bad actors operating across our consumer and fintech surfaces
 * Roadmap & strategy - define the multi-quarter security roadmap for account integrity and abuse defense, balancing user trust, growth, and risk
 * Team leadership - lead and grow a team of engineers spanning mobile and backend; set technical bar, review designs, mentor