Senior Android Engineer

• Conversational UI Architecture: Own the end-to-end development of the Personal Welcome Manager’s conversational interface on Android. You will build a fluid, intuitive, and polished user experience from the ground up.
• Designer-in-Lockstep Collaboration: Work “hand-in-glove” with our dedicated UX/UI designer, engaging in rapid daily iteration to translate high-fidelity, interactive prototypes into pixel-perfect, production-ready code.
• Real-Time Data Streaming: Engineer the high-performance “live transcript” view, which displays the AI-screened conversation as the phone is ringing. This involves consuming real-time streaming text data from our backend AI orchestration layer via WebSockets.
• Mastering Perceived Performance: Implement the critical “mid-call intervention” feature, allowing a user to seamlessly accept a call from the AI agent. You will become an expert in designing for our < 1000ms V2V (voice-to-voice) latency budget, ensuring the entire UX flow feels fast and responsive.
• API & Backend Integration: Partner with our backend (Application & AI Orchestration) engineers to define and integrate the client-side APIs and data models required to power the Welcome Manager’s features, from live transcription to post-call entity-extracted summaries.
• MWC Demo Ownership: Be directly responsible for the polish, stability, and performance of the Welcome Manager application for its critical debut at MWC 2026.
• Cross-Functional Partnership: Collaborate closely with the other Senior Android Engineer (who owns the native CallScreeningService and Security Shield overlay) to ensure a seamless and unified user experience between our two core products within a single application.

• Education & Experience: Bachelor’s degree in Computer Science or a related field, or equivalent practical experience.
• 5+ years of hands-on experience in native Android development, with a strong portfolio of shipped, consumer-facing applications.
• Deep expertise in native Android UI/UX development, including Kotlin and modern frameworks (e.g., Jetpack Compose, Coroutines, Flow).
• Demonstrated experience building complex, real-time, data-intensive user interfaces (e.g., chat applications, financial dashboards, real-time streaming apps).
• Strong experience integrating with backend APIs and services, particularly consuming real-time data via WebSockets, gRPC, or similar protocols.
• Proficiency in translating high-fidelity designs (e.g., Figma, Sketch) into beautiful, performant, and maintainable code.
• A strong understanding of Android UI performance optimization, memory management, and threading models.
• Experience with the full mobile development lifecycle, from ideation and prototyping to testing, release, and maintenance., * A strong portfolio that explicitly showcases beautiful, complex, and highly responsive mobile UIs you have built.
• Familiarity with Android’s native call-handling APIs (e.g., CallScreeningService, ConnectionService), as you will be integrating closely with the engineer who owns this.
• Experience with performance testing and profiling Android applications to hunt down and eliminate bottlenecks.
• Knowledge of mobile application security best practices.
• Previous experience working in a fast-paced, agile startup environment.
• Experience in the telecommunications or voice AI space.

This is a permanent position with hybrid working of two days a week in the central London office and the rest WFH.

Salary will be discussed based on experience.

We are seeking an exceptional Senior Android Engineer to join a newly-founded joint venture backed by five of the world’s leading telecommunications companies. Our mission is to restore trust in voice communication by building a network-native intelligence layer to combat the global epidemic of voice fraud and AI-driven scams.

This is a rare opportunity to be a foundational hire, shaping the future of a product designed to protect hundreds of millions of users. We are building two core products: the Telco-Verified Security Shield (our primary, pre-call fraud detection) and the Personal Welcome Manager (our premium, AI-powered call screening experience).