JavaFX Developer (m/f/d)

JavaFX Developer (m/f/d)
Lisboa
Lisboa, Lisboa, Portugal

We are seeking an experienced Java
FX Developer to design and develop rich, interactive desktop applications with a strong focus on performance, scalability, and elegant user experiences. The ideal candidate has deep expertise in Java
FX, core Java, and modern UI/UX design patterns, along with a proven ability to architect and deliver complex applications. You will collaborate with architects, backend developers, and designers to build responsive, modular, and
- performance applications used across enterprise environments. The role involves a balance of
- on development, technical leadership, and mentoring responsibilities.

Key Responsibilities

• Design and implement advanced desktop applications using Java
  FX, including custom controls, animations, and reusable UI components.
• Integrate frontend components with backend systems via REST APIs, Web
  Sockets, or message brokers.
• Ensure applications are performant, responsive, and maintainable across different operating systems.
• Define and implement architectural patterns such as MVVM/MVC with dependency injection frameworks.
• Maintain clean separation of concerns and scalable component structure.
• Profile and optimize rendering, data binding, and asynchronous task handling.
• Diagnose performance bottlenecks using tools like Visual
  VM, JProfiler, or Java Mission Control.
• Implement automated unit and UI tests using JUnit, Mockito, and Test
  FX.
• Conduct code reviews and enforce best practices in maintainability, readability, and test coverage.
• Work closely with UX designers and backend teams to refine requirements and deliver
  - quality features.
• Document architecture, workflows, and components for
  - term maintainability

Job Requirements

Technical Skills

• Proficiency in Java 8+ (preferably Java 17+), including collections, multithreading, streams, and generics.
• Deep expertise in Java
  FX (FXML, Scene Builder, CSS styling, custom components, animation, and 3D API).
• Strong understanding of MVVM/MVC patterns and dependency injection frameworks.
• Experience with REST APIs, Web
  Socket integration, and asynchronous programming.
• Hands-on experience with Maven/Gradle, Git, and CI/CD tools (e. g. , Jenkins, Azure Dev
  Ops, Git
  Hub Actions).
• Familiarity with unit testing and UI automation tools like JUnit, Mockito, and Test
  FX.
• Ability to tune performance and optimize UI rendering.
• Experience with
  - party Java
  FX libraries (Controls
  FX, Dev
  Express).
• Familiarity with microservices communication (g
  RPC,
  - driven design).

Education and Experience

• Bachelor's or Master's degree in Computer Science, Software Engineering, or equivalent field.
• Minimum 5 years of software development experience, with at least 2 years focused on Java
  FX.

Soft Skills

• Strong analytical and
  - solving capabilities.
• Excellent communication and teamwork skills.
• Attention to detail with a focus on quality and maintainability