Senior/Staff Mobile Security Engineer

Join World as a Senior/Staff Mobile Security Engineer to secure mobile applications at the core of the World protocol, ensuring privacy and integrity in a challenging threat landscape.

**About the Company:** World is building a real human network designed to accelerate people in the age of AI.

As bots and autonomous agents reshape the internet, people, institutions, and applications need a trusted way to confirm who is a real human while preserving privacy.

Our products make this possible: the Orb verifies real people, World ID proves it privately, and World App enables and distributes the new applications made possible by this technology.

Together, they form a new layer for AI internet.

We’re one of the fastest-growing networks in tech.

More than 17 million people across 160 countries have verified with World ID, and we complete over 350,000 verifications each week.

World App is already among the most used wallets globally.

Developers are integrating World ID to build safer online experiences and create spaces where real people can participate, earn, and be recognized in ways AI simply can’t replicate.

World was founded in 2019 and launched globally in 2023.

We are more than 400 people across hardware, software, AI, cryptography, mobile engineering, and global operations.

Our teams come from OpenAI, Tesla, SpaceX, Apple, Google, Stripe, Meta, Coinbase, Palantir and MIT Media Lab.

We’re backed by leading investors, including a16z, Khosla Ventures, Bain Capital Crypto, Blockchain Capital, Variant, Tiger Global, and Coinbase Ventures, as well as prominent operators and founders across fintech and AI.

## What you'll do

• •Design, build, and operate mobile device attestation and integrity verification systems across Android and iOS.
• •Engineer anti-tampering, anti-hooking, and runtime integrity protections for the World App.
• •Own the mobile hardening strategy end-to-end.
• •Design cryptographic protocols for on-device biometric authentication.
• •Build and maintain the server-side attestation verification infrastructure.
• •Lead threat modeling for mobile-specific attack surfaces.
• •Embed security into the mobile development lifecycle.
• •Mature our vulnerability management process for mobile.
• •Evaluate, integrate, and manage mobile security tooling and vendor relationships.

## Conditions

• •Salary ranges from $251,000 - $325,000 plus a competitive long-term incentive package.
• •Comprehensive and inclusive employee benefits including healthcare, dental, vision, 401(k) plan and match, life insurance, flexible time off, commuter benefits, professional development stipend, and more.

• •8+ years of hands-on experience in mobile security engineering.
• •Proven experience designing and operating mobile device attestation systems.
• •Strong background in mobile application hardening.
• •Experience with mobile reverse engineering and offensive security.
• •Proficiency in Kotlin/Java (Android) and/or Swift (iOS).
• •Experience securing on-device cryptographic operations.
• •Strong understanding of mobile-specific attack vectors.