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Senior Front End Developer

  • Remote
    • Spain, Catalunya [Cataluña], Spain
    • Germany, Berlin, Germany
    • Poland, Mazowieckie, Poland
    +2 more
  • Software Engineering *

Job description

About the role

We’re seeking a Senior Frontend Engineer to help build our AI-driven Zero Trust Network Access (ZTNA) platform. It provides real-time policy enforcement, secured remote access for enterprise endpoints.

You’ll design and develop AI-driven interfaces that will make the experience outstanding for end users.

Important:

  • This will be a permanent employment opportunity for candidates based in Spain, Germany, and Poland. If you prefer a B2B contract, please indicate it in your application form.

Key Responsibilities

  • Build scalable frontend architecture using React 19, TypeScript, and Redux Toolkit or similar frameworks, following our strict layered architecture

  • Develop AI-powered feature,s including real-time chat using Server-Sent Events (SSE), message streaming, and intelligent user interactions

  • Design and maintain our design system with Vanilla Extract synchronized with Figma designs

  • Write clean, testable code with comprehensive unit tests using Vitest

  • Collaborate cross-functionally with Product, Design, Backend, and AI teams to define and ship features

  • Optimize application performance

  • Leverage AI-assisted development with Claude Code or similar agents to accelerate feature development while adhering to our architectural patterns

  • Participate in code reviews and architectural decisions

  • Stay up to date with the latest front-end technologies, frameworks, and best practices

  • Ensure seamless integration with backend APIs and services

Tech Stack You'll Work With

  • Core: React 19, TypeScript 5.9, Rsbuild (Rspack), Redux Toolkit 2.10, RTK Query

  • UI: HeroUI (NextUI fork), Tailwind CSS 4, Vanilla Extract

  • Forms: React Hook Form, Valibot

  • Routing: React Router 7

  • Testing: Vitest, React Testing Library

  • Code Quality: Biome, SonarQube

  • Monitoring: Sentry

Job requirements

Required Qualifications

  • 5+ years of professional experience in frontend development

  • Deep understanding of HTML5, CSS3, and TypeScript.

  • Redux experience with Redux Toolkit, RTK Query, and complex state management

  • Testing skills with unit testing frameworks (Vitest, Jest) and React Testing Library or similar

  • RESTful API integration with async data handling, caching strategies, and error management

  • Build tools experience with Vite, Webpack, Rsbuild, or similar modern bundlers

  • Problem-solving abilities with debugging complex React applications and performance bottlenecks

  • Understanding of CI/CD pipelines and familiarity with Git workflows

  • Comfortable with AI-assisted development and willing to adopt modern AI coding tools

Nice to Have

  • Experience with Node.js or full-stack JavaScript environments

  • Tailwind CSS, CSS-in-JS (Vanilla Extract preferred)

  • Biome, ESLint, or Prettier configuration and code quality tooling

  • Sentry or similar monitoring tools for error tracking and performance monitoring

  • Docker for containerization and deployment pipelines

  • Familiarity with UI/UX design principles and Figma

  • Contributions to open-source projects or active participation in the developer community

What We Offer

  • Competitive salary and performance-based bonuses

  • Remote-first and flexible work arrangements

  • Access to modern tools, technology, and professional development resources

  • Inclusive, transparent, and collaborative work culture

  • Opportunities for rapid career growth in a scaling technology company

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