Senior Front-End Developer (m/f/d) Vienna Austria

Founded in 2012 is a dynamic and rapidly growing FinTech in Vienna and the best-known company for B2C investments in German-speaking countries.

We believe that everybody should be able to invest successfully in the capital markets regardless of whether you have 100 or 100000 to invest. We stand for the democratisation of the investment market and put our users at the centre of our focus.

Build high-performance web applications work with real-time financial data and shape the user experience of modern investing join us as a Senior Front-End Developer.

Responsibilities

• Develop maintain and optimize modern web applications using JavaScript (ES6) HTML and CSS.
• Build scalable reusable and maintainable UI components and front-end architectures.
• Design responsive accessible and high-performance user interfaces.
• Write clean modular and well-documented code following best practices and coding standards.
• Conduct thorough code reviews and provide constructive feedback to ensure high code quality and performance.
• Collaborate closely with designers backend engineers and product stakeholders to translate business requirements into robust UI solutions.
• Contribute to the full software development lifecycle (SDLC) from requirements and design through deployment and monitoring.
• Implement unit integration and end-to-end tests.

• Identify and resolve performance bottlenecks (e.g. rendering bundle size network issues).
• Optimize applications for speed and scalability (e.g. lazy loading code splitting).
• Stay up to date with evolving front-end technologies frameworks and browser APIs.
• Advocate for best practices in UX performance and maintainability.

Requirements

• Strong JavaScript expertise including a deep understanding of:
• JavaScript fundamentals
• ES6 features (closures promises async/await modules)
• Prototypal inheritance
• Functional programming concepts
• Deep understanding of browser internals including:
• Event loop call stack task queue microtasks
• Rendering pipeline (reflow repaint compositing)
• Strong knowledge of HTML5 and semantic markup
• Advanced understanding of CSS including:
• Cascading and specificity
• Layout systems (Flexbox Grid)
• Responsive design
• Animations and transitions
• Production experience with React 17/18 including hooks context composition patterns error boundaries and performance optimization (memoization lazy loading code splitting)
• Understanding of both server state (e.g. React Query SWR) and client state (e.g. Valtio Zustand Redux)
• Experience integrating REST APIs
• Strong understanding of web performance optimization techniques
• Experience with CI/CD pipelines including Docker builds branch-based deployment strategies and environment variable management across environments (dev/staging/prod)
• Experience with testing frameworks (e.g. Jest Vitest Cypress Playwright)
• Proficiency with CSS-in-JS solutions (e.g. Emotion Styled Components) including theming dynamic styles and SSR style injection
• Strong problem-solving skills and attention to detail
• Fluency in English (written and spoken) along with excellent communication skills and the ability to collaborate effectively in international teams

Nice to Have

• Experience with TypeScript and strong typing patterns
• Familiarity with SSR/SSG frameworks (e.g. Nuxt)
• Experience with design systems and component libraries
• Knowledge of Progressive Web Apps (PWAs)
• Familiarity with Azure (especially Front Door and storage for static assets)
• Basic understanding of backend concepts (APIs authentication flows microservices)
• Experience with monitoring tools (e.g. Dynatrace)

What you can expect

At an exciting job environment awaits you in a dynamic constantly growing and multiple award-winning fintech. Experimenting failing early learning and continuing is our motto. An innovative working world with opportunities for professional development is our goal. Expect real work-life balance as well. Become part of our team we live by our values transparency fairness ambition sustainability and joy and make investing available for everyone.

The minimum monthly salary for this position is 4476 gross in accordance with the IT-collectiveagreement however the salary we offer will be adjusted in line with the successful candidates qualifications and experience.