About the project
We are building a new industrial web platform designed to run both as an Azure-hosted SaaS solution and as an air-gapped on-premises installation from a shared codebase.
The platform uses modern .NET technologies, with Avalonia UI powering the user interface across browser-based WebAssembly and desktop applications.
You will help build the core UI framework, creating a reusable, modular, and high-performance interface for industrial dashboards and data-intensive applications.
The stack is .NET 10, ASP.NET Core, PostgreSQL/TimescaleDB, Keycloak, Docker and Kubernetes, with all UI in Avalonia.
We are looking for a Middle/Senior Frontend Developer with strong C#/.NET and Avalonia UI experience to build the user interface of a new industrial web platform running in the browser through WebAssembly and sharing code with desktop applications.
This is a UI-focused engineering role, not a traditional JavaScript frontend position. We are looking for someone experienced in building complex interfaces, reusable components, and UI architecture using Avalonia, or strong WPF/XAML expertise combined with hands-on Avalonia experience.
Requirements
- 5+ years of commercial experience with C# and .NET, including modern .NET versions.
- Production experience with Avalonia UI, or strong WPF/XAML experience combined with hands-on Avalonia development.
- Solid understanding of MVVM, dependency injection, and asynchronous programming.
- Experience building custom controls, styles, themes, and data-intensive interfaces such as grids, charts, and dashboards.
- Ability to write maintainable, testable code and collaborate through Git-based code review workflows.
- Availability to work remotely from within the EU and overlap with the US East Coast working hours from 08:00 to 13:00 ET.
Nice to have
- Experience migrating desktop applications from WPF or WinForms to Avalonia.
- Hands-on experience with Avalonia UI running in the browser through WebAssembly and understanding of its limitations.
- Familiarity with LiveCharts2, ScottPlot, OxyPlot, or commercial UI control libraries.
- Experience with plug-in systems or modular UI architectures.
- Unit testing of view models and automated testing practices.
- Knowledge of OIDC authentication, Keycloak, notifications, and file uploads.
- Experience optimizing WebAssembly applications through trimming, AOT compilation, or lazy loading.
- Familiarity with accessibility standards (WCAG) and localization.
- Experience building industrial, IIoT, manufacturing, or other data-intensive dashboard applications.
- Basic knowledge of ASP.NET Core and REST/OpenAPI.
Responsibilities
- Build the Avalonia UI shell: navigation, layouts, user preferences, and responsive and touch-friendly design.
- Create a reusable component library and themes (light, dark, high-contrast), with customer branding kept separate from themes.
- Implement UI extension points so plug-ins can add pages, dashboards and settings, with visibility driven by roles and licenses.
- Test and help select charting and control libraries for Avalonia WASM.
- Set up the localization architecture and port existing WPF screens to Avalonia.
- Optimize WASM load time and performance across the four target browsers.
- Write unit tests, take part in code reviews, and document UI decisions.
