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 Kraków. 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. Interested? Great, apply now and help us to Power the Possible. We offer a competitive benefit package and plenty of opportunities to stretch and grow your career:   Up to 21,000 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  About the role As part of Kingfisher’s Engineering Centre in Krakow, we are expanding our teams dedicated to Castorama Polska – one of the country’s most recognized DIY retail brands. These teams will be shaping the future of retail by building and evolving Castorama’s mobile app, e-commerce platform, and the back-office systems that power store operations across Poland. If you join us, you will not just be writing code – you will be directly influencing how millions of customers shop, browse, and interact with their local Castorama stores. From launching a new generation of mobile apps to streamlining in-store tech, your work will have a real, visible impact in your own backyard.As a Mid Software Engineer within our frontend domain, you will contribute to building and maintaining high-quality, scalable solutions that support our business goals. You will work closely with your squad to solve technical challenges, improve our frontend systems, and deliver features that enhance the user experience. In this role, you will collaborate with engineers, product managers, and designers, taking ownership of tasks and contributing to the overall technical direction of the team. With a passion for frontend technologies and a focus on continuous learning, you will play an important part in strengthening our engineering practices and delivering impactful products. Responsibilities  Develop, maintain, and optimise frontend solutions to ensure they are reliable, scalable, and performant  Collaborate with backend engineers, product managers, and designers to deliver features aligned with product goals  Contribute to the frontend architecture and codebase, following best practices in coding, testing, and deployment  Write clean, maintainable code and participate in code reviews to ensure high standards of quality  Apply frontend testing frameworks (e.g. Playwright, Jest) to deliver robust and well-tested features  Support CI/CD processes and help improve development workflows  Keep accessibility and user experience best practices in mind when implementing features  Stay up to date with evolving frontend technologies and suggest improvements where relevant  Communicate progress and challenges clearly within the team and contribute to problem-solving discussions  Skills and Experience   Strong experience with frontend technologies including TypeScript, HTML, CSS  Practical experience using modern frameworks such as React.js (Remix a plus)  Good understanding of web architecture and working with RESTful APIs, JSON, and GraphQL  Experience with frontend testing tools (Playwright, Jest)  Familiarity with CI/CD pipelines and version control (e.g. GitLab, GitHub)  Awareness of accessibility standards (WCAG) and user-centred design principles  Solid understanding of software engineering practices, quality principles, and non-functional requirements  Strong problem-solving skills with the ability to take ownership of tasks and deliver independently  Good communication and collaboration skills within cross-functional teams  Excellent command of English (written and spoken)