Senior Mobile Security Developer - Contract (Inside IR35)
We are seeking a Senior Mobile Security Developer to support the design, development and assurance of secure mobile applications within a complex technology environment. This is a contract opportunity operating inside IR35, suited to an experienced security-focused software engineer who can combine hands-on development expertise with a strong understanding of mobile application security, secure architecture and risk management.
You will work across the mobile development lifecycle, helping teams identify and address security risks from initial design through to release and ongoing maintenance. Responsibilities will include performing threat modelling and security reviews, assessing Android and iOS applications, reviewing source code, identifying vulnerabilities, and recommending practical remediation. You will contribute secure coding patterns, authentication and authorisation controls, encryption strategies, secrets management, certificate and key protection, API security, device integrity controls and appropriate mobile data-protection measures. You will also support security testing, including static and dynamic analysis, penetration-testing remediation and investigation of vulnerabilities affecting mobile applications or supporting services.
The successful candidate will have substantial experience developing or securing mobile applications, ideally across both Android and iOS ecosystems, with strong knowledge of Kotlin, Swift, Java, Objective-C or comparable technologies. Experience with mobile application security standards and guidance, such as OWASP MASVS and MSTG, is expected, along with familiarity with security tooling, CI/CD pipelines and automated testing. You should be comfortable working with developers, architects, testers and delivery stakeholders, explaining complex security concerns clearly and helping teams implement effective solutions without unnecessarily affecting usability or delivery. Strong analytical and problem-solving skills, attention to detail, and the ability to work independently in a contract environment are essential. Experience integrating security controls into agile development practices and managing findings through to closure would be highly valuable.
Senior Mobile Security Developer - Contract (Inside IR35)
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