Senior Security Engineer: Mobile & API Security (Remote)

Arcus Search; Greater London; Remote; GBP 90,000 - 120,000; Full time

Job summary

Arcus Search is assisting a leading financial technology company in the UK to hire two Senior Security Engineers focused on mobile and application security. You will work hands-on with mobile and backend teams to design and implement security controls across the development lifecycle.

The role emphasizes secure mobile app development, API security, and collaboration with product managers to embed security throughout projects. Hybrid/remote options are available in the UK.

Qualifications

• Proven experience in application security roles (App Sec / Product Sec / Mobile).
• Strong knowledge of mobile-to-API interaction patterns and attack vectors.
• Hands-on security work with engineering teams across mobile and backend systems.

Responsibilities

• Secure mobile applications (iOS/Android) including auth, data and runtime protections.
• Secure APIs with OAuth, token-based auth, rate limiting and abuse prevention.
• Conduct threat modelling, design reviews and hands-on security reviews of mobile/backend systems.
• Collaborate with product managers and engineers to embed security in development processes.

Skills

Mobile security

API security

Threat modelling

Secure SDLC

Job description

Arcus Search is assisting a leading financial technology company in the UK to hire two Senior Security Engineers focused on mobile and application security. You will work hands-on with mobile and backend teams to design and implement security controls across the development lifecycle.

The role emphasizes secure mobile app development, API security, and collaboration with product managers to embed security throughout projects. Hybrid/remote options are available in the UK.