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

wikifolio Financial Technologies AG
Wien, W

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Details zur Stelle

Vollzeit

Vollständige Stellenbeschreibung

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)

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.

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