Senior Frontend Engineer — AI-Driven UI & Design Systems

Relativity; Kraków; Hybrid; PLN 208,000 - 312,000; Full time

Job summary

Relativity in Kraków is seeking a Senior Frontend Engineer to design, develop, and maintain scalable frontend solutions for our AI-powered legal data platform. You will build reusable UI components, contribute to the design system, and partner with product and UX to deliver high-impact features.

The role emphasizes technical leadership, code quality, accessibility, and performance. You will work in a hybrid environment, collaborating with global teams while growing your skills in modern

Qualifications

• Advanced proficiency in JavaScript, TypeScript, React and frontend architecture.
• Strong knowledge of software architecture, design patterns and distributed systems.
• Experience building design systems, reusable platforms and shared tooling.
• Experience with automated testing, CI/CD and software quality practices.
• Experience with AI-assisted development tools and workflows.
• Excellent communication, collaboration, mentoring, and technical leadership skills.

Responsibilities

• Design and implement complex software solutions and platform capabilities.
• Lead technical discussions and contribute to architectural decision making.
• Develop and maintain shared frontend capabilities, reusable UI components, and design system assets.
• Drive modernization initiatives and adoption of engineering best practices.
• Mentor engineers and support technical growth across teams.
• Improve application quality, maintainability, accessibility, security, and performance.
• Partner with Product, UX, and Engineering stakeholders to deliver business value.

Skills

JavaScript

TypeScript

React

Frontend architecture

Design patterns

CI/CD

Job description

Relativity in Kraków is seeking a Senior Frontend Engineer to design, develop, and maintain scalable frontend solutions for our AI-powered legal data platform. You will build reusable UI components, contribute to the design system, and partner with product and UX to deliver high-impact features.

The role emphasizes technical leadership, code quality, accessibility, and performance. You will work in a hybrid environment, collaborating with global teams while growing your skills in modern