Senior Front-End Developer (m/f/d), Vienna, Austria
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
- 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).
- Advocate for best practices in UX, performance, and maintainability.
Requirements
- Prototypal inheritance
- Functional programming concepts
- Event loop, call stack, task queue, microtasks
- Strong knowledge of HTML5 and semantic markup
- Advanced understanding of CSS, including:
- Cascading and specificity
- Layout systems (Flexbox, Grid)
- 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 multipleaward-winning fintech. Experimenting, failing early, learning and continuing is our motto. An innovativeworking world with opportunities for professional development is our goal. Expect real work-life balanceas well. Become part of our team – we live by our values transparency, fairness, ambition, sustainabilityand joy and make investing available for everyone.
The minimum monthly salary for this position is €4,476 gross, in accordance with the IT-collectiveagreement, however the salary we offer will be adjusted in line with the successful candidate’s qualifications and experience.
