Ready to create the future, not just write features? Join Synmatch AI's client as a Mobile App Developer on the founding engineering team building the next generation of testing and analysis software for a global premium provider of measurement and testing instruments. You'll develop companion apps enabling seamless connectivity between professional instruments and cloud services for electrical trade, industry, and public institutions. Our client has decades of expertise in electrical safety, e-mobility, medical technology, power quality, and energy management systems. You'll create applications for smartphones and tablets that support field workflows, device connectivity, and offline-first operations for professionals working with high-quality measurement technology. This role combines mobile development expertise with industrial IoT connectivity, where you'll build apps that visualize measurement data, manage device interactions, and integrate with backend APIs while ensuring reliable performance in demanding field environments. What you will do as a Mobile App Developer... Develop Cross-Platform Apps: Build and maintain mobile applications for iOS, Android, and Windows using Flutter as the core framework Complement High-End Hardware: Connect hardware via Bluetooth LE, Wi-Fi, or USB to make strong measurement and testing capabilities shine in workflows supporting users' objectives Convert Complex Data Into Smart Insights: Efficiently store and process large volumes of measurement data and transform it into meaningful charts guiding users in their complex domain Connect To The Ecosystem: Integrate the application with API services of the new corporate cloud platform and collaboratively design the future ecosystem Own Application Quality: Maintain a scalable, robust, and reliable codebase covered by automated tests to keep pushing innovation via continuous delivery What we are looking for… Mobile App Development: 4–6+ years building apps for phones and tablets, with 2+ years of strong Flutter expertise Dart Fluency: Deep understanding of Dart including ecosystem, asynchronous programming (Futures/Streams), and memory management API Integration: Experience integrating mobile apps with REST APIs and backend services Offline Capabilities: Experience handling offline data storage, synchronization, and connectivity challenges Mobile UI/UX: Understanding of mobile design best practices and user experience principles Passion for Complex Domains: Curiosity about new and complex topics including electrical engineering concepts; willingness to understand large volumes of complex measurement data Desirable (but not required): Background in industrial or technical product environments Experience with time-series or measurement data visualization Experience with test-driven development Experience with Bluetooth connectivity or hardware-connected applications Benefits and perks… Founding Influence: Contribute to the technical direction of a product defining a category for the next decade Specialist Team: Work alongside a dedicated power-quality analyst, data-processing engineer, visualization engineer, and hardware product teams Real Engineering Culture: ADRs, performance budgets, and reference test vectors are first-class artifacts Made-in-Germany Quality: Decades of measurement-instrument heritage with a customer base that notices when the numbers are right