Senior Mobile Systems Engineer (Flutter & Agentic AI)

Company DescriptionOur Client is a real estate developer creating AI-native, agentic homes and workplaces, with an intelligent agent that learns its occupants and adapts the environment toward wellness and longevity. Their mobile super app is the primary interface to this intelligence, bringing together identity, services and ambient AI in one ecosystem. Our Client runs a lab and experience centre where products are tested with real residents, and has a pipeline of thousands of units to deploy into.Our Client is a fast-moving, founder-led organisation where engineers shape the product directly and own what they build.Job DescriptionRole OverviewWe are looking for a Senior Mobile Systems Engineer who views mobile development not just as "building screens," but as architecting the primary interface for Agentic Intelligence. You will be responsible for building a high-performance Super App that seamlessly integrates financial services, identity, and ambient AI.This is a hybrid role requiring deep Flutter expertise and strong Backend engineering skills. You will lead the transition from static, menu-driven interfaces to Agentic UIs that leverage Voice (TTS/STT), Vision, and Generative UI patterns to anticipate and serve user needs.Key Responsibilities Super App OrchestrationArchitect and maintain a scalable Flutter codebase capable of hosting multiple "mini-apps" (Fintech, Lifestyle, Identity) within a single ecosystemImplement complex user lifecycles, including SSO (Single Sign-On), multi-factor authentication, and tiered KYC (Know Your Customer) workflowsLead the integration of multi-provider Payment Systems (Apple/Google Pay, Stripe, and direct banking APIs) Agentic & Conversational InterfacesDesign and build Agentic Interfaces where the UI dynamically adapts based on AI-inferred user intent (GenUI)Implement low-latency, streaming TTS (Text-to-Speech) and STT (Speech-to-Text) systems for ambient and voice-first interactionsIntegrate mobile-side AI agents that can perform actions on behalf of the user across different modules of the Super App Fullstack EngineeringDevelop and optimise high-concurrency Backend APIs (Python/Node.js/Go) that power the mobile experienceDesign secure data synchronisation patterns for offline-first capabilities and real-time state managementManage infrastructure for mobile-specific needs, such as push notification orchestration and OTA (Over-The-Air) updates Performance & SecurityEnsure the Super App maintains a 60fps+ performance profile even with heavy AI and media processingImplement rigorous security standards for handling sensitive financial and identity data (biometrics, secure enclave, encrypted storage)RequirementsRequirementsTechnical RequirementsMobile Framework: Flutter (Expert), Dart, Platform Channels (Swift/Kotlin)AI Integration: TTS/STT (Whisper, ElevenLabs, Google Cloud Speech), OpenAI/Claude SDKsSuper App Features: SSO (OAuth2, OpenID Connect), KYC (Sumsub, Jumio), Payments (Stripe, Adyen)Backend: Python (FastAPI/Django) or Node.js, REST/GraphQL, WebSocketsState Management: Riverpod, Bloc, or SignalsDevOps / Mobile Ops: CI/CD (GitHub Actions, Fastlane), App Store/Play Store automationSecurity: JWT, OAuth2, Biometric Auth, ProGuard/R8, SSL PinningThe "Modern Take": What We ExpectBeyond the Grid: You don't just build lists and buttons. You think about how an AI agent can "drive" the UI for the userVoice-Native: You understand the nuances of voice UX: handling interruptions, background noise, and emotional prosody in TTSSecurity by Design: You treat KYC and Payment flows as mission-critical infrastructure, not just API callsProduct Mindset: You bridge the gap between "what is technically possible" and "what feels like magic for the user."Preferred QualificationsExperience building apps with 1M+ MAU (Monthly Active Users)Contributions to the Flutter ecosystem (open-source packages or plugins)Experience with on-device ML (TensorFlow Lite, CoreML) for privacy-preserving AI featuresStrong understanding of Micro-frontend or Micro-app architectures in a mobile contextWhy Join Us?We are moving past the era of "apps as tools" into the era of "apps as partners." You will be the lead architect of this transition, building the most sophisticated mobile entry point for agentic systems in the market.BenefitsA competitive package in line with market standards, commensurate with experience and seniority