Android Developer

Senior Android Engineer – Mobile Security

Location: London (Hybrid)

Type: Contract

We’re hiring a Senior Android Engineer to join a high-performing mobile engineering team within a major UK financial services organisation.

This team sits at the heart of mobile security, building and maintaining a suite of cutting-edge security components that protect millions of users. You’ll play a key role in shaping secure mobile experiences across a large-scale, multi-brand environment.

About the Role

You’ll work on designing and developing secure, scalable Android components and services used across multiple mobile applications. This is a highly collaborative role, working closely with engineering, architecture, and strategy teams to deliver robust security solutions in an evolving threat landscape.

What You’ll Be Doing

• Design, build, and maintain secure Android components and libraries
• Contribute to mobile security architecture and best practices
• Collaborate with cross-functional teams to deliver scalable, reusable solutions
• Support performance optimisation, testing, and continuous improvement
• Help shape the future of mobile security within a large-scale platform

What We’re Looking For

• Strong experience with Kotlin and/or Java for Android development
• Deep understanding of the Android SDK, UI principles, and best practices
• Experience with:
• Offline storage, threading, and performance tuning
• Android architecture patterns (MVVM / MVI)
• Android Architecture Components and Jetpack libraries
• Jetpack Compose
• Familiarity with modularised codebases
• Strong knowledge of version control tools (e.g. Git)
• Experience with UI testing

Nice to Have

• Experience working on security-focused mobile applications
• Exposure to mobile app security practices (e.g. obfuscation, penetration testing support)
• Experience working in large-scale or regulated environments

What’s on Offer

• Competitive salary
• Hybrid working (London-based)
• Opportunity to work on high-impact mobile platforms used by millions
• Collaborative, forward-thinking engineering environment