Job
- Level
- Senior
- Job Field
- Web, Front End
- Employment Type
- Full Time
- Contract Type
- Permanent employment
- Location
- Vienna
- Working Model
- Onsite
Job Summary
In this role, you will develop high-performance web applications using JavaScript, HTML, and CSS while building scalable UI components, identifying performance bottlenecks, and implementing tests.
Job Technologies
Your role in the team
- Build high-performance web applications, work with real-time financial data, and shape the user experience of modern investing.
- 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.
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Our expectations of you
Qualifications
- Strong JavaScript expertise, including a deep understanding of JavaScript fundamentals, ES6+ features (closures, promises, async/await, modules), prototypal inheritance, and functional programming concepts.
- Deep understanding of browser internals, including event loop, call stack, task queue, microtasks, and 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.
- Understanding of both server state (e.g., React Query, SWR) and client state (e.g., Valtio, Zustand, Redux).
- Starkes Verständnis für Web-Performance-Optimierungstechniken.
- 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.
Experience
- Production experience with React 17+/18, including hooks, context, composition patterns, error boundaries, and performance optimization (memoization, lazy loading, code splitting).
- Experience integrating REST APIs.
- 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).
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What we offer
- 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.
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Benefits
Work-Life-Integration
Health, Fitness & Fun
Topics that you deal with on the job
Job Locations
This is your employer
wikifolio Financial Technologies AG
Wien
wikifolio.com is a young and dynamic company with its headquarters in Vienna. We, the team behind this innovative investment platform, have set ourselves the goal of establishing social trading as the preferred alternative for European private investors.
Description
- Company Type
- Startup
- Working Model
- Full Remote, Hybrid, Onsite
- Industry
- Internet, IT, Telecommunication
Senior Front-End Developer
- Location
- Vienna
- Working Model
- Onsite
- Diversity
- Open for all genders
- English Only
- English only required
