Senior Mobile Security Developer – Contract (Inside IR35)

About This Opportunity

We are representing a confidential digital consultancy seeking a Senior Mobile Security Developer for an initial 6-month contract engagement. This is an Inside IR35 contract based in London, with a hybrid working arrangement requiring 2 days per week on-site.

Our client works on business-critical digital transformation projects, delivering secure and scalable mobile solutions for ambitious organizations. This role sits within their mobile practice and requires deep expertise in mobile security architecture, testing, and implementation.

Responsibilities

• Lead the design and delivery of security services for mobile platforms, including penetration testing, threat modeling, and security consultancy
• Define secure technical approaches and squad-level architecture for mobile projects
• Develop and implement threat models and risk mitigation strategies
• Translate business objectives into technical security strategy and ensure alignment with long-term goals
• Conduct mobile security assessments and implement security controls across Android and iOS applications
• Communicate security recommendations to clients and manage technical expectations
• Drive adoption of Agile methodologies and resolve technical impediments
• Foster continuous improvement in security practices, tooling, and team capabilities
• Contribute to end-to-end mobile development and security excellence across full-stack systems

What We're Looking For

Required expertise:

• Strong hands-on experience with Android and iOS security fundamentals, including common threats, vulnerabilities, and mitigation techniques
• Practical experience in mobile penetration testing and security assessments
• Deep understanding of authentication, authorization, cryptography, encryption, and secure design principles
• Systematic approach to identifying and resolving mobile security issues
• Strong knowledge of security architecture and controls for mobile platforms
• Ability to recommend and implement appropriate cryptographic controls
• Experience with Agile methodologies
• Excellent client communication skills

Desirable skills:

• Experience with reverse engineering tools such as Burp Suite Pro, Frida, Objection, JADX, IDA Pro, Hopper, Radare, ADB, Apktool, or Xcode
• Knowledge of Android/iOS development and secure development practices
• Familiarity with DevSecOps tooling, testing frameworks, and automation
• Programming experience in C, Java, Kotlin, Objective-C, Swift, JavaScript, Python, or Bash
• Understanding of ARM/ARM64 assembly
• Awareness of Cloud security and emerging mobile security technologies

How We Work With You

When you apply through Get A Job.ai, a member of our talent team will review your profile and conduct an initial screening conversation. If there's a strong match, we will submit your details to our client for consideration. Please do not contact the client directly, as all applications must come through our recruitment process to be considered.

The client's interview process typically includes an initial conversation, a practical craft showcase (take-home exercise or presentation), and a competency-based discussion focused on problem-solving and collaboration.

Contract Details

This is a 6-month initial contract, Inside IR35, based in London with hybrid working (2 days per week on-site). Contract rate information will be discussed during the screening process with our recruitment team.

Equal Opportunity: Get A Job.ai is committed to equal employment opportunity. We welcome applications from all qualified candidates regardless of race, gender, disability, religion, belief, sexual orientation, or age.