Senior Front-End Engineer – Hybrid (Poland)

OneRail; Kraków; Hybrid; PLN 223,000 - 312,000; Full time

Job summary

OneRail is hiring a Senior Front-End Engineer in Krakow to build responsive, high-performance interfaces that seamlessly connect to backend APIs. You will collaborate with designers and backend engineers to ensure smooth API integration and robust UI delivery.

The role emphasizes modern React-based development, SSR considerations, and a drive to leverage AI tools to boost productivity and code quality. The position is hybrid, requiring 2–3 days per week in the office, with a competitive salary

Qualifications

• 6+ years of professional experience in frontend software development.
• Strong understanding of HTML5, CSS3, and CSS preprocessors.
• Familiarity with state management libraries such as MobX, Jotai, or similar solutions.
• Experience with unit, integration, and end-to-end testing using tools such as Jest, React Testing Library, and Playwright.
• Experience with data-fetching and server-state management libraries such as TanStack Query (React Query).
• Experience integrating REST APIs and working with OpenAPI/Swagger specifications and generated API clients.
• Experience with server-side rendering and front-end architecture patterns, e.g. micro front-end or single page applications
• Strong understanding of front-end UI/UX principles and best practices.
• Knowledge of performance monitoring tools for front-end applications.
• Experience with Agile methodologies and CI/CD practices using GitHub Actions.
• Familiarity with containerization using Docker.
• Excellent problem-solving and debugging skills.
• Ability and willingness to use AI tools to improve productivity and code quality.
• Advanced proficiency in English, both written and spoken (B2+).

Responsibilities

• Design and develop high-quality, responsive user interfaces.
• Integrate frontend applications with backend APIs.
• Write clean, maintainable, and efficient front-end code following best practices.
• Identify and resolve front-end bugs and performance issues.
• Implement best practices for security, scalability, and performance optimization.
• Conduct code reviews and provide constructive feedback.
• Collaborate with backend developers, product managers, and other stakeholders to gather and refine requirements, present proposed solutions, and translate business needs into technical solutions.
• Explore and improve the use of AI tools in frontend development workflows.
• Stay up to date with the latest front-end development trends and technologies.

Skills

English (B2+)

Team collaboration

Problem solving

Tools

HTML5

CSS3

MobX

Jotai

React Testing Library

Playwright

TanStack Query

REST APIs

OpenAPI/Swagger

SSR

Docker

GitHub Actions

Job description

OneRail is hiring a Senior Front-End Engineer in Krakow to build responsive, high-performance interfaces that seamlessly connect to backend APIs. You will collaborate with designers and backend engineers to ensure smooth API integration and robust UI delivery.

The role emphasizes modern React-based development, SSR considerations, and a drive to leverage AI tools to boost productivity and code quality. The position is hybrid, requiring 2–3 days per week in the office, with a competitive salary