Senior Software Engineer

Skills and experience Proven professional experience in back-end development with Node.js and GraphQL. Proficiency in JavaScript and TypeScript, with excellent experience using Visual Studio. Solid hands-on experience with AWS services. Strong knowledge of Git and containerisation technologies (Docker). Good understanding of CI/CD pipelines and modern development workflows. Familiarity with authentication and authorisation mechanisms (OAuth). Excellent analytical and problem-solving abilities, with strong attention to detail. Strong communication skills and proven ability to work effectively in team environments. Excellent command of English (written and spoken) Who we are and what we create?   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 25,000 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. Do you thrive in an agile environment that embraces modern design, architecture, and tools? Look no further   Our Mobile development team is growing, and we’re seeking GraphQL and NodeJS developer who wish to further their career. As part of our team, you’ll be given the opportunity to drive and deliver exceptional work. Our mission? To craft a world-class mobile experience for our customers. We’re on the lookout for top talent to build NodeJS and GraphQL middleware for new iOS and Android native apps and potential to work further afield.   ,[Design, develop, and maintain scalable and robust back-end systems using Node.js and GraphQL.  , Implement and manage server-side logic ensuring high performance and responsiveness  , Develop and maintain schemas and resolvers for GraphQL APIs.  , Deploy, monitor, and manage applications on AWS.  , Collaborate with front end developers, product managers, and other stakeholders to define API requirements and functionalities.  , Optimize applications for maximum speed and scalability.  , Troubleshoot and debug applications and perform code reviews.  , Create and maintain comprehensive documentation for new and existing features.  , Manage and mentor junior members of the team  ] Requirements: Backend, Node.js, GraphQL, JavaScript, TypeScript, Visual Studio, AWS, Git, Docker, CD pipelines, OAuth, Communication skills Additionally: Private healthcare, Sport subscription, Child Insurance, Language courses, LinkedIn Learning, Training budget, Life Assurance, Kingfisher Pension Scheme, Transport Discount, Free parking.