Join a specialist technology business delivering secure, high-performance software into some of the UK’s most critical environments. This role plays a key part in building robust Android applications that operate where reliability and security truly matter.Role Overview:Location: Hybrid – Cheltenham - Once per month onsite Package: £70,000 – £90,000Industry: Secure Software / Defence TechnologyWhat You’ll Be Doing:Designing and developing high-quality Android applications using Kotlin for secure, real-world deploymentsBuilding scalable, maintainable code using modern frameworks and architectural patternsIntegrating mobile apps with backend services (APIs, messaging systems, secure endpoints)Enhancing performance across battery, memory, and responsiveness for demanding environmentsEmbedding security best practices across the full development lifecycleContributing to architecture decisions and evolving mobile design standardsCollaborating with cross-functional teams across engineering, security, and cloudSupporting code reviews and driving consistent engineering qualityProducing clear technical documentation and supporting delivery in Agile teamsMain Skills Needed:Strong commercial Android development experience, primarily with KotlinSolid grasp of modern Android architecture (e.g. MVVM, MVI, Clean Architecture)Experience integrating APIs and handling data via tools like Retrofit or similarUnderstanding of secure mobile development practices (encryption, authentication, secure storage)Familiarity with testing approaches across unit, UI, and integration levelsExperience with build tools and development environments such as Gradle and Android StudioKnowledge of CI/CD pipelines, version control (Git), and Agile deliveryEligibility to obtain SC clearanceWhat’s in It for You:Work on meaningful projects within highly secure, mission-critical environmentsStrong salary package with long-term career stabilityHybrid working model with flexibility built inOpportunity to influence architecture and technical directionExposure to cutting-edge secure mobile and cloud technologiesCollaborative, highly skilled engineering environmentOngoing learning and development in a specialist domainCall to Action:Curious? Apply now — or grab five minutes with us to hear more.We are an equal opportunity employer and value diversity at our company. We do not discriminate on the basis of race, religion, colour, national origin, gender, sexual orientation, age, marital status, veteran status, or disability status.By applying you are confirming you are happy to be added to the Addition Solutions mailing list regarding future suitable positions. You can opt out of this at any time simply by contacting one of our consultants.