Senior Software Engineer (React)

Overview

Senior Software Engineer (React)

(Hybrid/Kraków – 1 day per week in the office)

We’re Kingfisher, a team made up of over 74,000 passionate people who bring Kingfisher - and all our other brands: Castorama, B&Q, Screwfix, Brico Dépôt and Koçtaş - to life. That’s right, we’re big, but we have ambitions to become even bigger and even better. We want to become the leading home improvement company and grow the largest community of home improvers in the world. And that’s where you come in.

At Kingfisher, our customers come from all walks of life, and so do we. We want to ensure that all colleagues, future colleagues, and applicants to Kingfisher are treated equally regardless of age, gender, marital or civil partnership status, colour, ethnic or national origin, culture, religious belief, philosophical belief, political opinion, disability, gender identity, gender expression or sexual orientation.

We are open to flexible and agile working. Therefore, we offer colleagues a blend of working from home and our office, located in Yeovil, Somerset. Talk to us about how we can best support you!

At Kingfisher, we value the perspectives that any new team members bring, and we want to hear from you. We encourage you to apply for one of our roles, even if you do not feel you meet 100% of the requirements.

In return, we offer an inclusive environment, where what you can achieve is limited only by your imagination! We encourage new ideas, actively support experimentation, and strive to build an environment where everyone can be their best self.

We offer a competitive benefit package and plenty of opportunities to stretch and grow your career: 

• 20,000 - 28,000 PLN gross per month on an employment contract

• Private medical healthcare at LUXMED (including dentalcare) for you and your family

• Medicover sports card (Fit&More package)

• Life insurance financed by the employer

• 30-minute lunch break included in the 8-hour working day

• Work in a highly professional and stimulating atmosphere

• Training & Buddy programme that will allow you to quickly adapt to your new role

• Wellbeing programme for employees

• Co-financing of monthly tickets for the public transport in Krakow

• Comfortable working environment in the office and the possibility of home office

• Language courses, accounting courses, access to LinkedIn Learning and the possibility of co-financing studies and certification

• Employee referral programme 

What's the job?

About the role

As a Senior Software Engineer within our frontend domain, you will play a key role in designing, building and delivering high-quality, scalable solutions that support our business objectives. Working as part of a cross-functional Agile squad, you will solve complex technical challenges and contribute to engineering excellence through modern development practices.

You will collaborate closely with Software Engineers, Engineering Squad Leads, Principal Engineers and Architects to deliver robust, maintainable solutions while sharing your knowledge, mentoring less experienced engineers and contributing to a culture of collaboration, innovation and continuous improvement.

If you're looking for an exciting opportunity to step out of your comfort zone and make a real impact building better software, this is the job for you! 

Responsibilities

• Design, develop and maintain high-quality, scalable and maintainable frontend solutions that support business objectives.

• Take ownership of complex technical tasks, ensuring solutions are performant, reliable and aligned with engineering standards.

• Collaborate closely with backend engineers, Product Managers, Designers and other stakeholders to deliver customer-focused solutions.

• Contribute to technical design discussions and support the evolution of frontend architecture and engineering practices.

• Champion high standards of code quality through testing, code reviews and adherence to development best practices.

• Identify opportunities to improve development processes, tooling and application performance, driving continuous improvement within the squad.

• Share knowledge, support and mentor less experienced engineers, contributing to a culture of collaboration and continuous learning.

• Build effective relationships across engineering and the wider business, communicating technical decisions and progress clearly.

What you'll bring

• Strong commercial experience developing high-quality, scalable frontend applications using modern engineering practices.

• Proficiency in TypeScript, HTML and CSS, with hands-on experience building applications using React.js and Remix.

• Good understanding of web technologies, frontend architecture and application performance optimisation.

• Experience integrating with RESTful APIs, GraphQL and JSON-based services.

• Solid knowledge of frontend testing practices and tools, including Playwright and Jest.

• Experience working with CI/CD pipelines, version control systems and modern development workflows.

• Good understanding of accessibility standards (WCAG), responsive design and user experience best practices.

• Strong knowledge of software engineering principles, clean code practices and non-functional requirements.

• Excellent analytical and problem-solving skills, with the ability to deliver solutions to complex technical challenges.

• Strong communication and collaboration skills, with experience working effectively in cross-functional Agile teams.

• Self-motivated, proactive and comfortable taking ownership of technical solutions while supporting and mentoring other engineers.

• Excellent command of English (written and spoken)