Mid/Senior React Developer (MUI 9 migration)

Job Overview

We are seeking a skilled Mid/Senior React Developer to join our team. 

Project Context

Our client's platform is migrating all applications to MUI 9. As part of this effort, a central SSR-compatible component library will be built from the ground up. The project runs across three phases: Analysis → Piloting → Scaling.

Responsibilities

• Technical inventory, including CSR vs. SSR and existing implementations per application.

• Build the central MUI 9-based component library.

• Develop composite components: App Shell, Header, Panel Layouts, Form Structures.

• Define design tokens and theme infrastructure, including colors, typography, and branding.

• Implement all components to be SSR-compatible from day one, including Next.js / Service Requests.

• Set up and maintain Storybook documentation, lifecycle-oriented.

• Handle Figma handoff and propagate design decisions into the product.

• Pilot components in real modules of selected applications.

Requirements

React & MUI 9

• Expert-level React knowledge, including Hooks, Context, performance, and composition patterns.

• MUI v9, including migration from v4/v5, theme customization, and sx system.

• Composite component design, including App Shell, Panel Layouts, and Form Structures.

• Design token integration and tree-shaking, including icons and bundle optimization.

SSR / CSR / Next.js

• Deep understanding of SSR and CSR, including differences, implications, and tradeoffs.

• Next.js, including SSR-compatible component development without retrofitting.

• Ability to identify and prevent hydration issues.

Library & Tooling

• Building and maintaining shared component libraries, including monorepo setup.

• Storybook, including documentation, controls, and lifecycle management.

• TypeScript, including type-safe component interfaces.

• Figma handoff and design token propagation.

Architecture

• Micro-frontend architectures are nice to have, especially relevant in later phases.

• White-label theming and multi-tenant systems are nice to have.

• CI/CD for component libraries, including versioning and publish workflows, is nice to have.

Seniority

• At least 5 years of relevant frontend experience.

• Proven experience building or maintaining component libraries.

• Experience in cross-team projects with multiple product teams.

Benefits

• Opportunity to participate in a cutting-edge project with a dynamic and innovative team.

• Professional growth through engagement in technical interviews and project development phases.

• Remote work (Poland).

• Unique TEAL culture, relationship- and respect-driven community, non-corporate atmosphere.

• Agile approach and no bureaucracy.

• Outstanding integration trips to various places in Europe for all employees.

• Activities to support your well-being and health.

• Luxmed Gold Extended medical care and Multisport Plus benefit.

• Engagement in innovative projects within a supportive and collaborative environment.

• Flexible working arrangements to promote work-life balance.

• Access to modern tools and technologies to enhance productivity.