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- Tasks: Architect and build high-performance mobile apps for real-time communication.
- Company: Innovative tech company redefining mobile interactions for major brands.
- Benefits: Competitive salary, remote-first culture, and opportunities for impactful work.
- Why this job: Join a team tackling unsolved challenges in mobile systems and streaming.
- Qualifications: Deep experience in native mobile development, preferably both Android and iOS.
- Other info: Work with elite engineers in a high-trust, autonomous environment.
The predicted salary is between 130000 - 150000 £ per year.
This isn’t your typical mobile app startup. The company is redefining what’s possible in real-time interaction and remote collaboration, powering zero-download, enterprise-grade screen sharing and co-browsing used by some of the biggest brands in the world. Their technology enables instant, secure, and frictionless experiences between customers and support teams, all in the browser, across devices, and at global scale. 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.
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.
Tech Stack:
- 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.
Mobile Engineer employer: Immersum
Contact Detail:
Immersum Recruiting Team
StudySmarter Expert Advice 🤫
We think this is how you could land Mobile Engineer
✨Tip Number 1
Network like a pro! Reach out to folks in the industry on LinkedIn or at meetups. You never know who might have the inside scoop on job openings or can put in a good word for you.
✨Tip Number 2
Show off your skills! Create a portfolio showcasing your best mobile projects. Whether it's apps you've built or contributions to open-source, let your work speak for itself.
✨Tip Number 3
Prepare for interviews by practising common technical questions and coding challenges. We recommend using platforms like LeetCode or HackerRank to sharpen your skills before the big day.
✨Tip Number 4
Apply through our website! It’s the best way to ensure your application gets seen. Plus, we love seeing candidates who are genuinely interested in joining our team.
We think you need these skills to ace Mobile Engineer
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. We want to see your expertise in Kotlin and Swift shine through, so don’t hold back on those impressive projects you've worked on!
Tailor Your Application: Take a moment to customise your application for this role. Mention how your experience aligns with our focus on real-time communication and performance optimisation. We love seeing candidates who understand what we’re all about!
Be Clear and Concise: Keep your application straightforward and to the point. We appreciate clarity, so avoid jargon and make sure your passion for mobile engineering comes across. Remember, less is often more!
Apply Through Our Website: Don’t forget to submit your application through our website! It’s the best way for us to keep track of your application and ensure it gets the attention it deserves. We can’t wait to hear from you!
How to prepare for a job interview at Immersum
✨Know Your Tech Stack Inside Out
Make sure you’re well-versed in the technologies mentioned in the job description, especially Kotlin and Swift. Brush up on your knowledge of real-time systems and low-latency networking, as these are crucial for the role.
✨Showcase Your Problem-Solving Skills
Prepare to discuss specific challenges you've faced in mobile development and how you overcame them. Think about performance optimisation or complex app architecture — they’ll want to see your thought process and technical insight.
✨Engage with Real-World Scenarios
Be ready to talk about how you’ve worked directly with customers in the past. Share examples of how you’ve helped them optimise their mobile experiences, as this role involves direct customer interaction.
✨Demonstrate Your Collaborative Spirit
Since the role requires cross-functional collaboration, think of examples where you’ve worked with backend or security engineers. Highlight your communication skills and how you’ve contributed to a team’s success.
