At a Glance
- Tasks: Join a dynamic team to develop and enhance Android applications using Kotlin and modern tech.
- Company: Innovative client in the financial services sector, offering a collaborative work environment.
- Benefits: Flexible hybrid role with competitive pay and potential for extension beyond 8 weeks.
- Other info: Opportunity to grow your skills in a supportive, non-territorial team atmosphere.
- Why this job: Make an impact by working on cutting-edge mobile technology in a fast-paced setting.
- Qualifications: Experience in Android development, Kotlin, and navigating large codebases is essential.
The predicted salary is between 63000 - 77000 £ per year.
My client has a need for an experienced Android Engineer to join their team for an initial 8 week piece of work with potential to extend. This is a hybrid role and is outside of IR35.
Technical Skills:
- Android (primary depth), Kotlin and modern Android in large production codebases; Jetpack Compose alongside legacy View-based UI.
- Multi-module builds: reading, untangling and mapping them, including convention plugins and version catalogues.
- DI frameworks and the ability to derive actual runtime structure from wiring.
- Architectural patterns in practice (MVVM, MVI, Clean-style layering), and the ability to identify what a codebase genuinely does.
- Code archaeology and analysis.
- Navigating an unfamiliar large codebase quickly and systematically.
- Static analysis, dependency graph extraction, module dependency visualisation, code search at scale.
- Reading CI/CD pipelines as a source of architectural truth: Fastlane, Bitrise, GitHub Actions, Jenkins, Gradle/Xcode build logic.
- Reconstructing runtime behaviour from instrumentation, logging and observability tooling (Crashlytics, Sentry, Dynatrace, Firebase or similar).
- Backend and API: Tracing a request from UI through the mobile networking layer to the backend service and back.
- REST/GraphQL/gRPC, OpenAPI and contract inspection, API gateway and BFF patterns.
- OAuth 2.0 / OIDC token flows as implemented on device.
- Third-party SDK inventory and assessment: analytics, payments, chat, fraud, marketing, feature flags.
- Banking-specific mobile concerns: Secure storage, biometric authentication, device binding, certificate pinning as implemented in code.
- Feature flags, remote config, phased/staged rollout, kill switches.
- Offline behaviour, caching and state management, and what happens at the edges.
Essential non-technical skills:
- Structured interviewing – runs a technical interview that yields specifics rather than a tour of opinions, and captures it in a form the team can use.
- Rigorous note-taking and traceability – findings can be traced back to a source; distinguishes what was observed in code from what someone said.
- Collaborative, non-territorial — will be reviewing other engineers' work in front of them; needs to do it without triggering defensiveness.
- Self-directed under time pressure — 8 weeks means little supervision and no ramp-up period.
- Fluent professional English, spoken and written.
Nice to have:
- Financial services or other regulated-sector mobile delivery.
- Kotlin Multiplatform, React Native, or hybrid/webview integration experience.
- Diagramming from code: Structurizr, PlantUML, Mermaid, dependency-graph tooling.
- Accessibility and performance profiling experience.
- Consultancy or contracting background with multiple client environments.
- iOS working knowledge (second depth) - Swift, SwiftUI/UIKit, SPM and Xcode project structure — sufficient to read the codebase and validate the Architect's iOS findings.
Mobile Engineer employer: Hydrogen UK Ltd
Hydrogen UK Ltd is an exceptional employer, offering a dynamic work culture that fosters innovation and collaboration within the public sector and defence landscape. Employees benefit from comprehensive professional development opportunities, competitive remuneration, and the chance to engage with cutting-edge technologies while making a meaningful impact on government programmes. Located in a vibrant area, the company promotes a supportive environment where every team member's contributions are valued and recognised.
StudySmarter Expert Advice🤫
We think this is how you could land Mobile Engineer
✨Get Involved in Open-Source Projects
Diving into open-source projects is a brilliant way to showcase your skills and connect with other developers in the community. Not only will you beef up your GitHub profile but you might also catch the eye of someone at Hydrogen UK Ltd who values hands-on experience over just theory.
✨Attend Local Tech Meetups
Tech meetups are gold mines for networking and discovering job opportunities, especially in the fast-paced world of software engineering. Check out local listings for events in your area and don’t shy away from introducing yourself. This could lead directly to a temporary position at Hydrogen UK Ltd!
✨Showcase Your Work Online
With temporary roles, it’s all about standing out in a short space of time. Create a portfolio website where you highlight your projects and skills. Talk about your code, and provide links to your GitHub repositories. This will not only demonstrate your abilities but will also make it easier for recruiters at Hydrogen UK Ltd to see what you bring to the table.
✨Leverage Temporary Job Boards
Don’t forget to check specialised job boards for temporary software development roles. Websites like We Work Remotely or Remote OK often list short-term gigs that can be a perfect fit. Apply directly through our website as well, making sure your application is sharp—temporary roles can move fast!
We think you need these skills to ace Mobile Engineer
Some tips for your application 🫡
Show Off Your Tech Skills:Make sure your CV highlights your tech stack and any programming languages you’re proficient in. Include specifics about any frameworks or technologies you’ve worked with; they can make you stand out in the sea of applicants. It’s all about showing that you have the chops we need at Hydrogen UK Ltd!
Portfolio 2.0:Since you’re applying for a temporary gig, it’s super important to showcase a portfolio that highlights your best projects. Include links to GitHub or any personal projects that demonstrate what you can do in a real-world environment. This gives us a taste of your style and your problem-solving approach!
Keep It Brief and Relevant:With a temporary position, we want to see your ability to hit the ground running. Be concise in your CV and cover letter; stick to experiences that directly relate to the role. Highlight any previous temporary roles or freelance gigs that show your adaptability and quick learning!
Tailor Your Cover Letter:Don’t just send a generic cover letter. Personalise it for Mobile Engineer at Hydrogen UK Ltd! Mention why this temporary role excites you and how you see yourself contributing in the short run. Show us what you've got and why you're the one for this quick turn-around!
How to prepare for a job interview at Hydrogen UK Ltd
✨Nail the Technical Skills
For a software engineering role, you'll likely face technical questions or coding tasks during your interview. Brush up on the relevant programming languages and frameworks that Hydrogen UK Ltd uses, and don’t forget to practice some coding challenges on platforms like LeetCode or HackerRank. Showing your coding prowess can really make you stand out!
✨Prepare for System Design Questions
Even for a temporary role, having a grasp of system design principles can be crucial. Be ready to discuss how you would architect a software solution, including discussing trade-offs, scalability, and performance considerations. Having examples from previous projects can really show off your analytical thinking.
✨Demonstrate Your Adaptability
Since this is a temporary role, you'll want to emphasise your ability to hit the ground running. Highlight experiences where you quickly adapted to new technologies or teams. Let’s make it clear to the interviewers at Hydrogen UK Ltd that you can learn on the job and deliver results in a short timeframe!
✨Show Off Your Portfolio
Make sure to have a portfolio or GitHub ready showcasing your projects. Having tangible evidence of what you've done—be it personal projects, contributions to open-source, or previous work—can convey how capable you are. Tailor this for what might interest Hydrogen UK Ltd, so it's relevant and sparks conversation during your interview.
