Senior Mobile Systems Engineer (Flutter & Agentic AI)

Company Description

Our 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 Description

Role Overview
We 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

1. Super App Orchestration

• Architect and maintain a scalable Flutter codebase capable of hosting multiple “mini-apps” (Fintech, Lifestyle, Identity) within a single ecosystem.
• Implement complex user lifecycles, including SSO (Single Sign-On), multi-factor authentication, and tiered KYC (Know Your Customer) workflows.
• Lead the integration of multi-provider Payment Systems (Apple/Google Pay, Stripe, and direct banking APIs).2. Agentic & Conversational Interfaces

• Design 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 interactions.
• Integrate mobile-side AI agents that can perform actions on behalf of the user across different modules of the Super App.3. Fullstack Engineering

• Develop and optimise high-concurrency Backend APIs (Python/Node.js/Go) that power the mobile experience.
• Design secure data synchronisation patterns for offline-first capabilities and real-time state management.
• Manage infrastructure for mobile-specific needs, such as push notification orchestration and OTA (Over-The-Air) updates.4. Performance & Security

• Ensure the Super App maintains a 60fps+ performance profile even with heavy AI and media processing.
• Implement rigorous security standards for handling sensitive financial and identity data (biometrics, secure enclave, encrypted storage).

Requirements

Technical Requirements

• Mobile Framework: Flutter (Expert), Dart, Platform Channels (Swift/Kotlin)
• AI Integration: TTS/STT (Whisper, ElevenLabs, Google Cloud Speech), OpenAI/Claude SDKs
• Super App Features: SSO (OAuth2, OpenID Connect), KYC (Sumsub, Jumio), Payments (Stripe, Adyen)
• Backend: Python (FastAPI/Django) or Node.js, REST/GraphQL, WebSockets
• State Management: Riverpod, Bloc, or Signals
• DevOps / Mobile Ops: CI/CD (GitHub Actions, Fastlane), App Store/Play Store automation
• Security: JWT, OAuth2, Biometric Auth, ProGuard/R8, SSL PinningThe “Modern Take”: What We Expect

• Beyond the Grid: You don’t just build lists and buttons. You think about how an AI agent can “drive” the UI for the user.
• Voice-Native: You understand the nuances of voice UX: handling interruptions, background noise, and emotional prosody in TTS.
• Security by Design: You treat KYC and Payment flows as mission-critical infrastructure, not just API calls.
• Product Mindset: You bridge the gap between “what is technically possible” and “what feels like magic for the user.”Preferred Qualifications

• Experience 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 features.
• Strong understanding of Micro-frontend or Micro-app architectures in a mobile context.

Why 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.

• A competitive package in line with market standards, commensurate with experience and seniority.