Lead Frontend Engineer - Platform UI & Design Systems

Relativity

Kraków

Hybrid

PLN 270,000 - 406,000

Full time

3 days ago

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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.