Frontend React Developer

Infotree Global Solutions Inc.; Warszawa; On-site; PLN 180,000 - 240,000; Full time

Job summary

Infotree Global Solutions Inc. is seeking a Senior Front-End Engineer to design, develop, and maintain modern web applications. You will collaborate with Product Managers, UX Designers, and cross-functional teams to translate requirements into intuitive interfaces.

We value code quality, performance, and clean architecture. The role emphasizes React/TypeScript proficiency, testing, and alignment with agile processes in a fast-paced environment.

Qualifications

• 5+ years of professional front-end experience building modern web apps.
• Strong commercial experience with React and TypeScript.
• Experience delivering complex front-end solutions in Agile environments.
• Proven ability to work across multiple projects simultaneously.

Responsibilities

• Design, develop, and maintain web applications using React and TypeScript.
• Build reusable, scalable UI components with high performance.
• Translate business/UX requirements into robust technical solutions.
• Ensure responsive, accessible interfaces and maintainable code.

Skills

5+ years experience

React

TypeScript

Agile

Cross-project work

Education

Bachelor's degree in CS or related

Tools

Redux

Node.js

Jest

Cypress

Playwright

Vitest

Vite

Webpack

Job description

Position Summary

We are looking for a passionate and experienced Senior Front-End Engineer to join our engineering team and help build modern, scalable, and high-performance web applications. You will collaborate with Product Managers, UX Designers, Architects, and fellow Engineers to transform business requirements into intuitive user experiences while contributing to the technical direction of our front-end ecosystem.

This role is ideal for someone who enjoys solving complex technical challenges, writing clean and maintainable code, and continuously learning new technologies in a fast-paced Agile environment.

Key Responsibilities

Front-End Development

• Design, develop, and maintain modern web applications using React and TypeScript.

• Build reusable, scalable, and high-performance UI components.

• Translate business and UX requirements into robust technical solutions.

• Ensure responsive, accessible, and user-friendly interfaces.

Architecture & Engineering

• Contribute to front-end architecture and technical design decisions.

• Promote clean code principles, best practices, and coding standards.

• Optimize application performance, scalability, and maintainability.

• Participate in code reviews and mentor less experienced developers.

Testing & Quality

• Develop automated unit, integration, and end-to-end tests.

• Ensure high code quality using modern testing frameworks and CI/CD practices.

• Identify and resolve technical issues throughout the software development lifecycle.

Collaboration

• Work closely with Product Owners, UX Designers, QA Engineers, and cross-functional development teams.

• Participate in Agile ceremonies, sprint planning, estimation, and retrospectives.

• Contribute to continuous improvement initiatives and technical innovation.

Required Qualifications

Experience

• 5+ years of professional experience developing modern web applications.

• Strong commercial experience with React and TypeScript.

• Experience delivering complex front-end solutions in Agile environments.

• Proven ability to work across multiple projects simultaneously.

Technical Skills

• Expert knowledge of React.

• Strong proficiency in TypeScript and modern JavaScript (ES6+).

• Experience with Angular is considered an advantage.

• Solid understanding of state management (Redux).

• Experience with Node.js and front-end tooling.

• Hands-on experience with testing frameworks such as Jest, Cypress, Playwright, and Vitest.

• Familiarity with Vite and modern build tools.

• Experience with CSS-in-JS and responsive UI development.

• Understanding of Server-Side Rendering (SSR).

Soft Skills

• Strong analytical and problem-solving abilities.

• Excellent communication and stakeholder management skills.

• Self-driven, proactive, and eager to learn new technologies.

• Ability to thrive in a collaborative, fast-paced engineering environment.

Preferred Qualifications

• Bachelor's degree in Computer Science or a related field.

• Experience with Micro Frontend architecture.

• Knowledge of reactive programming using RxJS.

• Experience with Webpack, Vite, and modern front-end build pipelines.

• Experience working across the full Agile software development lifecycle.

• Exposure to enterprise-scale web applications.

What Success Looks Like

• Delivering high-quality, scalable, and maintainable front-end applications.

• Driving technical excellence through clean architecture and best engineering practices.

• Building intuitive user experiences that meet business needs.

• Collaborating effectively with cross-functional teams to deliver features on time.