Senior Front End Developer

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.

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

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<