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United Kingdom Crossing Hurdles Full timeWe refer candidates to Mercor that collaborates with the world’s leading AI research labs to build and train cutting-edge AI models. Position: Android Mobile Software Engineer (Kotlin) Type: Hourly Contract Compensation: $200/hour median average pay Location: Remote Commitment: Part-time, 10–40 hours per week, fully remote and asynchronous...
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United Kingdom Crossing Hurdles Full timeAt Crossing Hurdles, we work as a referral partner. We refer candidates to Mercor that collaborates with the world’s leading AI research labs to build and train cutting-edge AI models.Organization: MercorPosition: Android Mobile Software Engineer (Kotlin)Referral Partner: Crossing HurdlesType: Hourly ContractCompensation: $200/hour median average...
Mobile Engineer
4 weeks ago
Job Title: Senior Mobile Engineer / Architect (iOS / Android) Location: Remote – UK Salary: £130,000 - £150,000 The Company 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. 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. 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.
