Senior Front-End (React) Developer

Coberon Chronos; Poland; On-site; PLN 180,000 - 340,000; Full time

Benefits offered by this job

Competitive compensation

Performance incentives

Learning support

Job summary

A fast-growing technology firm is looking for a Senior Front-End (React) Developer to create high-performance user interfaces. This remote position requires strong React expertise and experience in frontend architecture. You will collaborate closely with product and engineering teams. Ideal candidates have 6–10 years of development experience, a focus on performance optimization, and a mindset for clean, scalable code. This role also offers competitive compensation and growth opportunities in a dynamic environment.

Qualifications

• 6–10 years of frontend development experience, strong hands-on work with React.
• Expert-level knowledge of JavaScript (ES6+), HTML5, CSS3.
• Experience with modern styling approaches like Tailwind and SCSS.
• Strong grasp of the React ecosystem (Hooks, Context API, Redux, Zustand, React Query).
• Proven experience in responsive UI development, performance optimization, and cross-browser support.
• Hands-on experience integrating frontends with backend APIs.
• Familiarity with build tooling and pipelines (Webpack, Vite, Babel, CI/CD).
• Experience working in Agile/Scrum environments.
• Degree in Computer Science/Engineering preferred, not mandatory if experience is strong.

Responsibilities

• Design, build, and maintain scalable frontend applications using React.
• Collaborate with backend engineers to integrate frontend systems.
• Optimize applications for speed and cross-browser compatibility.
• Collaborate with backend engineers, data teams, product managers, and designers to deliver end-to-end features.
• Integrate frontend systems with REST APIs, GraphQL, and AI/ML-backed services.
• Mentor junior developers and help strengthen frontend capability across the team.

Skills

React expertise

JavaScript (ES6+)

HTML5

CSS3

Responsive UI development

Performance optimization

Agile/Scrum environments

Mentoring

Education

Degree in Computer Science/Engineering

Tools

Webpack

Vite

Babel

CI/CD

Job description

Senior Front-End (React) Developer

Company Overview

Our client is a fast-growing technology firm operating at the intersection of AI, data science, and digital transformation. They partner with global enterprises—especially in life sciences—to build AI-enabled solutions that improve decision-making, accelerate insights, and modernize commercial operations.

With established international delivery teams and continued expansion in Poland and Hungary, they are scaling our digital platforms and are looking for a Senior React Developer to build high-performance, enterprise-grade user interfaces in close collaboration with product, delivery, and business stakeholders. This is a full-time, remote position based in Poland or Hungary.

Role Overview

As a Senior React Developer, you will design, develop, and optimize frontend applications that power AI and analytics products. You’ll bring strong React expertise, solid frontend architecture judgment, and a practical UI/UX mindset to deliver clean, scalable, and responsive interfaces for complex, data-heavy workflows.

Key Responsibilities

Frontend Development & Architecture

• Design, build, and maintain scalable frontend applications using React and modern web technologies.
• Create reusable components and shared UI libraries to improve consistency and delivery speed.
• Apply sound frontend architecture patterns to ensure maintainability and extensibility.
• Translate product requirements and UI designs into responsive, user-friendly interfaces.

Performance, Quality & Standards

• Optimize for speed, scalability, and cross-browser compatibility.
• Uphold high engineering standards through code reviews, testing, and documentation.
• Troubleshoot and resolve UI defects and performance bottlenecks across devices.
• Follow security, accessibility (WCAG), and usability best practices.

Collaboration & Integration

• Partner with backend engineers, data teams, product managers, and designers to deliver end-to-end features.
• Integrate frontend systems with REST APIs, GraphQL, and AI/ML-backed services.
• Contribute to sprint planning, technical discussions, and architectural decisions.
• Mentor junior developers and help strengthen frontend capability across the team.

Continuous Improvement

• Stay current with evolving frontend patterns, tools, and frameworks.
• Improve team standards, tooling, and workflows to raise quality and velocity.
• Participate in design and UX discussions to refine user experience.

Qualifications & Experience

• 6–10 years of frontend development experience, including strong hands‑on work with React.
• Expert-level knowledge of JavaScript (ES6+), HTML5, CSS3.
• Experience with modern styling approaches (e.g., Tailwind, CSS‑in‑JS, SCSS).
• Strong grasp of the React ecosystem (e.g., Hooks, Context API, and state/data tools such as Redux, Zustand, React Query).
• Proven experience in responsive UI development, performance optimization, and cross-browser support.
• Hands‑on experience integrating frontends with backend APIs.
• Familiarity with build tooling and pipelines (e.g., Webpack, Vite, Babel, CI/CD).
• Experience working in Agile/Scrum environments.
• Degree in Computer Science/Engineering (preferred, not mandatory if experience is strong).

Key Skills & Attributes

• React leadership: deep React expertise and modern frontend best practices.
• UI/UX judgment: detail-oriented, user‑first thinking, practical design sensibility.
• Code discipline: clean, modular, testable code; strong ownership of quality.
• Performance mindset: builds efficient, scalable user experiences.
• Collaboration: works well across distributed teams and multiple functions.
• Problem‑solving: independently diagnoses and resolves complex UI/integration issues.
• Ownership & adaptability: thrives in fast‑moving product/consulting environments.

What We Offer

• Work on enterprise‑scale platforms involving AI, analytics, and GenAI‑enabled products.
• Exposure to international clients, especially in life sciences and data‑driven domains.
• A collaborative culture with real technical ownership.
• Growth paths into frontend architecture or technical leadership.
• Competitive compensation, performance incentives, and learning support.