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For Companies At a Glance
- Tasks: Architect and build high-performance mobile apps for Android and iOS.
- Company: Join a remote-first tech company focused on innovative mobile solutions.
- Benefits: Competitive salary, flexible work environment, and opportunities for professional growth.
- Why this job: Make a real impact by tackling challenging technical problems in mobile engineering.
- Qualifications: Experience in native mobile development with Kotlin or Swift, and strong problem-solving skills.
- Other info: Collaborate with elite engineers in a supportive, high-trust culture.
The predicted salary is between 36000 - 60000 £ per year.
The Company
Now they're bringing that power to mobile, and they're looking for a world-class Mobile Engineer to help lead the charge across Android and iOS. If you love working close to the metal, care about performance and architecture, and enjoy engaging directly with customers to shape impactful solutions, this is your kind of role.
The Role
You'll be the technical backbone for mobile engineering within a globally distributed team. Your work will power customer interactions where milliseconds matter and reliability can't be compromised.
You will:
- Architect and build deeply performant Android and/or iOS apps that integrate with advanced real-time communication systems (WebRTC, low-latency streaming, complex data sync).
- Work directly with enterprise customers, helping them integrate and optimise mobile experiences using your technical insight.
- Own and optimise the full mobile lifecycle: architecture, modularisation, dependency management, build pipelines, and release automation.
- Push the limits of Kotlin, Swift, and the underlying SDKs — profiling, tuning, and rethinking architecture where needed.
- Collaborate cross-functionally with backend, systems, and security engineers to deliver secure, scalable, and high-performing mobile experiences.
- Prototype and benchmark next-generation features in areas like on-device encoding, network optimisation, and secure session management.
- Act as a mobile domain expert — setting technical direction, mentoring others, and influencing long-term product strategy.
You Should Have:
- Deep hands-on experience in native mobile development — either Android (Kotlin) or iOS (Swift), ideally both.
- Proficiency in Swift, with comfort reading or maintaining Objective-C codebases for lower-level integrations.
- Proven ability to build and scale complex, performance-critical apps or SDKs, ideally for enterprise or platform use.
- Experience with real-time systems, streaming, or low-latency networking.
- Mastery of profiling, debugging, and performance optimisation tools (Perfetto, Instruments, Systrace, etc.).
- Strong understanding of networking, concurrency, security, and system-level behaviour on mobile.
- Comfort with NDK/C++ integrations, JNI, or Metal where required for performance or low-level system access.
- Excellent communication skills — you can engage confidently with customers and internal stakeholders to deliver the best outcomes.
- Preference for candidates in US time zones, but open globally for the right person.
Android: Kotlin, Jetpack Compose, Coroutines, Clean Architecture, Android Architecture Components, Hilt/Dagger, WebRTC, gRPC, Protocol Buffers, NDK/C++, Bluetooth, low-latency networking, Gradle, Espresso, CI/CD (GitHub Actions, Bitrise)
iOS: Swift, Objective-C, SwiftUI, Combine, UIKit, Core Data, AVFoundation, WebRTC, gRPC, Protocol Buffers, Metal, Bluetooth, Instruments, XCTest, CI/CD (Fastlane, Xcode Cloud, GitHub Actions)
Why Join?
- Build flagship mobile experiences that power enterprise-scale interactions across the globe.
- Work with elite engineers who care about architecture, clean design, and measurable performance.
- Tackle hard, unsolved technical problems in low-latency streaming, mobile systems, and secure communication.
- 100% remote‐first, high‐trust culture — autonomy, mastery, and impact matter here.
- Competitive salary and benefits, plus the chance to define the mobile direction for a product used by millions.
Seniority Level: Mid‐Senior level
Employment Type: Full‐time
Job Function: Information Technology and Engineering
Industries: Software Development and IT System Custom Software Development
Mobile Engineer in London employer: Immersum
Contact Detail:
Immersum Recruiting Team
StudySmarter Expert Advice 🤫
We think this is how you could land Mobile Engineer in London
✨Tip Number 1
Network like a pro! Reach out to fellow engineers and industry professionals on LinkedIn or at tech meetups. You never know who might have the inside scoop on job openings or can refer you directly.
✨Tip Number 2
Show off your skills! Create a portfolio showcasing your best mobile projects, especially those that highlight your experience with Kotlin and Swift. This will give potential employers a taste of what you can do.
✨Tip Number 3
Prepare for technical interviews by brushing up on your coding skills and understanding system-level behaviour on mobile. Practice common interview questions related to performance optimisation and real-time systems.
✨Tip Number 4
Don’t forget to apply through our website! It’s the best way to ensure your application gets seen by the right people. Plus, we love seeing candidates who are proactive about their job search.
We think you need these skills to ace Mobile Engineer in London
Some tips for your application 🫡
Show Off Your Skills: When you're writing your application, make sure to highlight your hands-on experience with mobile development. Whether it's Kotlin or Swift, we want to see how you've tackled performance-critical apps and what cool projects you've worked on!
Tailor Your Application: Don't just send a generic application! Take the time to tailor your CV and cover letter to match the job description. Mention specific technologies and experiences that align with what we're looking for, like real-time systems or low-latency networking.
Be Clear and Concise: We appreciate clarity! Keep your application straightforward and to the point. Use bullet points where possible to make it easy for us to see your key achievements and skills at a glance.
Apply Through Our Website: Make sure you apply through our website! It’s the best way for us to keep track of your application and ensure it gets the attention it deserves. Plus, it shows you're serious about joining our team!
How to prepare for a job interview at Immersum
✨Know Your Tech Inside Out
Make sure you’re well-versed in the technologies mentioned in the job description, like Kotlin and Swift. Brush up on your knowledge of real-time systems and performance optimisation tools, as these will likely come up during technical discussions.
✨Showcase Your Problem-Solving Skills
Prepare to discuss specific challenges you've faced in mobile development and how you tackled them. Use examples that highlight your ability to optimise performance and manage complex architectures, as this role demands a strong problem-solving mindset.
✨Engage with Real-World Scenarios
Be ready to talk about how you’ve worked directly with customers to enhance their mobile experiences. This role involves customer interaction, so demonstrating your communication skills and ability to translate technical insights into user-friendly solutions is key.
✨Collaborate and Communicate
Since this position requires cross-functional collaboration, think of examples where you’ve successfully worked with backend or security engineers. Highlight your teamwork skills and how you can contribute to a high-performing, distributed team.
