Senior Frontend Engineer - aiR Assist

LE0002 Relativity Poland sp. z o.o.; Województwo małopolskie; Hybrid; PLN 208,000 - 312,000; Full time

Benefits offered by this job

DTO

Parental leave

Equity program

Job summary

Relativity Poland sp. z o.o. is seeking a Senior Frontend Engineer to lead the AI chat and agent UI on a scalable, cloud-native platform. You will own the frontend delivery for chat experiences, with a focus on reusable components and modular architecture.

You will collaborate with UX, Product, and Backend teams to drive accessibility, performance, and maintainability, while mentoring peers and advancing our frontend standards.

Qualifications

• 4–6+ years of frontend development experience building large-scale web apps or enterprise platforms.
• Advanced proficiency with JavaScript, TypeScript and the React ecosystem (hooks, concurrent rendering).
• Experience designing reusable UI infrastructure, shared libraries, and scalable frontend abstractions.

Responsibilities

• Design and implement scalable, performant chat and agent UIs using React, TypeScript, PrimeReact, and Relativity design systems.
• Build AI-powered chat experiences with streaming responses and state management.
• Contribute to modular micro-frontend platform and shared AI context services.
• Apply frontend modularization, code splitting, and Nx monorepo practices.
• Deliver accessible, responsive cross‑platform user experiences (WCAG).
• Collaborate with UX, Product, and Backend teams to ship rapid improvements.
• Define and promote frontend standards for testing, performance, and maintainability.
• Own frontend test coverage with Vitest, Playwright, and Storybook-driven components.
• Participate in CI/CD, progressive CDN deployments, and versioning strategies.

Skills

Frontend development

React

TypeScript

JavaScript (ES6+)

UI infrastructure

Modular architecture

WCAG accessibility

Testing

Tools

PrimeReact

Material UI

Nx

Vite

Webpack

Turborepo

Web Components

Job description

Posting Type Hybrid Job Overview

Posting Type Hybrid

WHO WE ARE

Relativity is a leading legal data intelligence company building technology that helps users organize data, discover the truth, and act on it with confidence. Our AI-powered, cloud platform, RelativityOne, transforms massive volumes of complex information into actionable insights for litigation, investigations, regulatory inquiries, data breach responses, and other high-stakes legal work where accuracy and trust are crucial. The world’s largest law firms, corporations, and government agencies rely on Relativity’s legal AI software to securely surface and manage the most relevant and impactful information in their matters. Beyond our commercial impact, we are committed to expanding access to technology and supporting pro bono legal work.

WHAT WE DO

The aiR Assist team builds the chat and agent experiences behind Relativity’s AI products. We create interactive, conversational user experiences that help legal and enterprise users leverage AI capabilities through scalable, reliable, and intuitive interfaces. Our team develops on top of a shared frontend platform that includes composable micro-frontends, shared AI context services, and a modular component architecture designed for rapid innovation and long-term maintainability.

ABOUT THE ROLE

We are looking for a Senior Frontend Engineer to join the aiR Assist team at Relativity. In this role, you will build and evolve the chat and agent experience behind our AI products, delivering the interactive, conversational UI that legal and enterprise users rely on. You will transform rapidly evolving AI capabilities into polished, dependable product experiences. You will own frontend delivery for AI chat and agent experiences while helping shape a modern frontend platform built on composable micro-frontends, shared context management, and modular architecture. Beyond implementation, you will help establish engineering standards, mentor peers, and drive quality, accessibility, performance, and maintainability across a large-scale cloud platform. We are looking for someone with a platform mindset who values reusable building blocks, clean module boundaries, and sustainable architecture while delivering product experiences that evolve quickly based on user feedback.

Job Description and Requirements

WHAT YOU’LL DO

• Design and implement scalable, performant, and maintainable chat and agent user interfaces using React 19, TypeScript, PrimeReact, and Relativity’s internal design systems.
• Build rich AI-powered chat experiences, including streaming responses, conversational state management, tool and skill interactions, and human-in-the-loop workflows.
• Consume and contribute to Relativity’s micro-frontend platform, including web component-based applications, CDN-delivered experiences, and shared AI context services.
• Apply frontend modularization practices through clean module boundaries, shared libraries, code splitting, and Nx monorepo development.
• Build responsive, accessible, and cross-platform user experiences that meet modern web accessibility standards (WCAG).
• Collaborate with UX, Product, and Backend Engineering teams to rapidly respond to user feedback and deliver continuous product improvements.
• Define and promote frontend engineering standards for testing, accessibility, performance, and maintainability.
• Own comprehensive frontend test coverage using Vitest, Playwright, visual regression testing, and Storybook-driven component development.
• Contribute to frontend CI/CD processes, including automated delivery pipelines, progressive CDN deployments, versioning strategies, and component lifecycle workflows.
• Mentor engineers and provide technical leadership across frontend-focused initiatives.
• Explore and integrate AI-driven enhancements into customer-facing and internal experiences.

WHAT WE’RE LOOKING FOR

• Required 4-6+ years of professional frontend development experience building large-scale web applications or enterprise platforms.
• Advanced proficiency with JavaScript (ES6+), TypeScript, and the modern React ecosystem, including hooks and concurrent rendering patterns.
• Demonstrated experience designing reusable UI infrastructure, shared libraries, and scalable frontend abstractions.
• Strong experience with modular architecture, code splitting, lazy loading, and micro-frontend concepts such as module federation, web-component composition, or similar approaches.
• Experience working with component libraries such as PrimeReact, Material UI, or similar frameworks.
• Strong responsive web design skills, including semantic HTML, modern CSS methodologies, and cross-device user experiences.
• Experience integrating with RESTful APIs and GraphQL services, as well as modern frontend state and data-fetching solutions such as React Query and Zustand.
• Familiarity with modern bundlers and monorepo tooling, including Vite, Webpack, Nx, or Turborepo.
• Strong understanding of frontend performance optimization, cross-browser compatibility, and web accessibility standards (WCAG).
• Hands‑on experience developing and maintaining automated tests using tools such as Vitest, Jest, Playwright, or Cypress.
• Preferred Experience building frontend infrastructure in cloud environments, particularly Microsoft Azure.
• Experience contributing to a design system or shared enterprise component library.
• Experience with module federation and runtime composition of independently deployed frontend applications.
• Understanding of backend technologies such as .NET or Node.js to support effective cross-functional collaboration.
• Familiarity with AI-enhanced frontend experiences, including chat interfaces, streaming responses, agentic workflows, or intelligent UI patterns.
• Interest in or experience with AI/ML-assisted UI and UX development, including personalization and generative interaction experiences.

WHY WE COULD BE A GREAT FIT

Impactful Mission

Build systems that help customers organize data, discover the truth, and act on it in high-stakes legal matters.

Engineering at Scale

Work on distributed, cloud-native systems that process large volumes of data.

Cutting-Edge Technology

Build with AI, cloud platforms, and scalable architectures shaping legal tech.

Growth and Ownership

Gain experience owning systems end-to-end across cloud and distributed environments.

Collaborative Culture

Work in a team focused on knowledge sharing and continuous improvement.

Inclusive Environment

Diverse perspectives create stronger teams and better outcomes.

Compensation and Benefits

Competitive salary, benefits, DTO, parental leave, and equity program.

Relativity is committed to competitive, fair, and equitable compensation practices.

Salary Range

The expected salary range for this role is between following values: 208 000 and 312 000PLN

The final offered salary will be based on several factors, including but not limited to the candidate's depth of experience, skill set, qualifications, and internal pay equity. Hiring at the top end of the range would not be typical, to allow for future meaningful salary growth in this position.

Required Skills

Automation, Data Analysis, Database Management, Network Architecture, Performance Optimizations, Problem Solving, Project Management, Software Development, System Designs, Technical Leadership

We’re solving big data challenges in the legal tech industry, and we’re always looking for more people to join us on the journey. At Relativity, you'll learn cross-functional skills to grow your career and have the chance to make a big impact on our customers, our industry, and our communities. We admire and value our employees, so it’s no surprise that our hiring process is designed to help us really get to know you – and for you to get to know us, too.