Senior Frontend Engineer - AI Platform & Micro-Frontends

Relativity; Kraków; On-site; PLN 208,000 - 312,000; Full time

Benefits offered by this job

Equity program

Parental leave

DTO

Job summary

Relativity is seeking a Senior Frontend Engineer to help shape the frontend architecture for its aiR Assist Platform. You will build reusable UI infrastructure, enable composable micro-frontend delivery, and create a seamless developer experience for teams building on the platform.

You will work at the center of frontend modularization, unifying experiences across AI chat products and contributing to an agent harness that flows context across host apps and embedded experiences.

Qualifications

• 4–6+ years of frontend development in large apps.
• Proficiency in JavaScript (ES6+), TypeScript, and React.
• Experience designing reusable UI infrastructure and micro-frontend patterns.
• Strong responsive and accessible UI skills (WCAG).
• Experience with REST/GraphQL and async data flows.
• Experience with monorepos and modern build tools.

Responsibilities

• Design scalable frontend infrastructure using React, TS, and design systems.
• Advance micro-frontend delivery and composition across tenants.
• Improve AI-enabled frontend context sharing and host-embedded experiences.
• Enforce coding standards, testing, performance, and accessibility.
• Lead automated tests with Vitest, Playwright, and Storybook-driven development.
• Mentor engineers and contribute to platform initiatives.

Skills

JavaScript (ES6+)

TypeScript

React ecosystem

Web performance

Accessibility WCAG

REST/GraphQL

Monorepo tooling

Testing (Vitest/Jest)

UX collaboration

Tools

Nx

Vite

Webpack

Storybook

PrimeReact

Job description

Relativity is seeking a Senior Frontend Engineer to help shape the frontend architecture for its aiR Assist Platform. You will build reusable UI infrastructure, enable composable micro-frontend delivery, and create a seamless developer experience for teams building on the platform.

You will work at the center of frontend modularization, unifying experiences across AI chat products and contributing to an agent harness that flows context across host apps and embedded experiences.