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Senior Application Security Engineer

Arcus Search

london, england, United-Kingdom Full-time June 08, 2026
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Vacancy Description

Senior Security Engineer – Mobile & Application Security

We are looking to hire two Senior Security Engineers with a strong focus on mobile application security to help raise the security bar across our mobile and backend platforms. This is a hands-on role, working closely with engineering and product teams to identify, design, and implement effective security controls throughout the development lifecycle.

Key Focus Areas

Mobile App Security (iOS & Android)

  • Authentication and authorization mechanisms
  • Secure data storage
  • Runtime protections and hardening techniques

API Security

  • OAuth and token-based authentication
  • Abuse prevention and rate limiting
  • Identification and mitigation of business logic vulnerabilities

Secure SDLC

  • Threat modeling and design reviews
  • Hands-on secur...

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