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Senior Security Engineer, Mobile and Application Security

Arcus Search — United Kingdom · Posted ~14 hours ago

Senior Contract Hybrid

Skills

Mobile application security iOS security Android security API security OAuth Token-based authentication Threat modeling Security reviews Authentication Authorization React iOS Android APIs Application security Mobile security

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Summary ✨ AI‑Generated

Join a security engineering team focused on protecting mobile and backend applications. You will assess iOS and Android security, API authentication and authorization, threat models, secure data handling, runtime protections, and business-logic vulnerabilities while partnering directly with product and engineering teams.

Highlights

Hands-on security role with responsibility across mobile and backend platforms. You will work closely with engineering and product teams to embed security controls throughout the development lifecycle, with a fully remote option and an extended engagement structure.

Description

Job Title: Senior Security Engineer – Mobile & Application Security Duration: 12 months + extension (Permanent is also considered if preferred) Location: UK - fully remote acceptable, hybrid much preferred IR35: Outside IR35 Industry: Leading financial technology company Project Details They are looking for two Senior Security Engineers with strong experience in mobile application security to help improve security across mobile and backend platforms. You will work hands-on with engineering and product teams to identify, design and implement security controls throughout the development lifecycle. Responsibilities Mobile application security across iOS and Android, including authentication and authorization mechanisms, secure data storage, runtime protections and hardening techniques.API security, including OAuth and token-based authentication, abuse prevention, rate limiting and business logic vulnerabilities.Conduct threat modelling, design reviews and hands-on security reviews of mobile and backend systems.Work closely with product managers and mobile/backend engineers to embed security into day-to-day development. Requirements Proven experience as an Application Security Engineer, Product Security Engineer or Mobile Engineer with a strong focus on application security.Strong understanding of mobile-to-API interaction patterns and common attack vectors in modern mobile applications.Strong hands-on experience across mobile and API security.Ability to work hands-on and pragmatically with engineering teams.Experience with React Native internals is nice to have.