Lead Frontend Engineer - Platform UI & Design Systems

Relativity; Kraków; Hybrid; PLN 270,000 - 406,000; Full time

Benefits offered by this job

DTO

Parental leave

Equity program

Job summary

Relativity Kraków is seeking a Lead Frontend Software Engineer to steer the frontend architecture for the Engineering Platform. You will drive shared UI frameworks, design systems, and advance modular, high-performance UI infrastructure powering our cloud-native apps.

You will mentor engineers, collaborate with architects and product teams, and push for accessible, scalable experiences across products. This role blends technical leadership with hands-on coding in React, TypeScript, and modern

Qualifications

• Advanced proficiency in JavaScript (ES6+), TypeScript, and React.
• Deep experience building and managing shared design systems using frameworks such as PrimeReact, Material UI, Bootstrap, or Tailwind.
• Strong understanding of semantic HTML, modern CSS, CSS preprocessors (SASS/LESS), and responsive UI design.
• Experience implementing Micro Frontend architectures or modular UI strategies in large-scale systems.
• Familiarity with RESTful APIs, GraphQL, and asynchronous programming patterns including async/await, Promises, and streaming updates.
• Experience with frontend performance profiling and cross-browser testing strategies.
• Deep knowledge of accessibility standards (WCAG) and commitment to inclusive design.
• Hands-on experience with CI/CD pipelines, frontend build tooling such as Vite or Webpack, and testing frameworks.
• Preferred Background in .NET or backend technologies such as Node.js or Python to support cross-stack collaboration.
• Understanding of UX principles and experience contributing to design system governance and design-engineering alignment.
• Experience with AI-driven UI/UX, including chatbot integration, recommendation engines, personalization, or adaptive layouts.
• Familiarity with design and prototyping tools such as Figma, Sketch, or Adobe XD.

Responsibilities

• Set and communicate technical vision for frontend architecture across multiple platform teams.
• Lead the development of shared UI infrastructure, design system components, and micro frontend integration strategies using React, TypeScript, and PrimeReact.
• Collaborate with Staff and Principal Engineers to ensure alignment with long-term architectural goals and cloud-first principles.
• Partner with product, UX, and engineering leadership to define and deliver scalable frontend capabilities aligned to customer needs and business outcomes.
• Guide the team on best practices in accessibility, performance, test automation, and maintainability.
• Drive technical excellence through architectural reviews, pair programming, mentoring, and hands-on development.
• Contribute to and evolve CI/CD workflows, component versioning strategies, and documentation processes.
• Champion frontend performance techniques including lazy loading, code splitting, asset optimization, and telemetry.
• Define and enforce standards for UI testing, including unit, integration, and end-to-end testing using Jest, Cypress, or Playwright.
• Mentor senior and mid-level engineers, strengthening technical leadership across the team.
• Lead initiatives exploring AI-enhanced UI/UX, including smart component behavior, generative layout patterns, and adaptive interfaces.

Skills

JavaScript (ES6+)

TypeScript

React

Design systems

Accessibility (WCAG)

CI/CD

AI-driven UI/UX

Tools

PrimeReact

Material UI

Bootstrap

Tailwind

Job description

Relativity Kraków is seeking a Lead Frontend Software Engineer to steer the frontend architecture for the Engineering Platform. You will drive shared UI frameworks, design systems, and advance modular, high-performance UI infrastructure powering our cloud-native apps.

You will mentor engineers, collaborate with architects and product teams, and push for accessible, scalable experiences across products. This role blends technical leadership with hands-on coding in React, TypeScript, and modern