Mid/Senior React Developer (MUI 9 migration)

Senior • Remote

110 - 150 PLN

Warsaw, Poland

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

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.

YourITeams

YourITeams is a technology company operating in the IT services sector, with a strong focus on software development and quality assurance for complex financial and fintech systems, including payments, cards, and lending platforms. The company collaborates closely with product and engineering teams to deliver reliable, high-quality digital solutions. YourITeams promotes an agile, non-corporate environment characterized by a unique TEAL culture that emphasizes trust, relationships, respect, and self-management. With distributed teams and a remote-first approach, the company values flexibility, collaboration, and continuous improvement, fostering a supportive community-oriented atmosphere across its international workforce.

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