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

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Founded in 2012, wikifolio.com 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 €100,000 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., Next.js, 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 wikifolio.com 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 €4,476 gross, in accordance with the IT-collective agreement, however the salary we offer will be adjusted in line with the successful candidate’s qualifications and experience.

Apply now