Senior Software Engineer - React

Overview

Senior Software Engineer (React) 

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. 

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 in the Web Platform team, you will help build, maintain and improve the shared frontend platform used by multiple engineering teams. You will work across frontend applications, cloud services, developer tooling and production operations to deliver reliable, scalable solutions and improve the experience of teams using the platform.

This role is ideal for an experienced engineer who enjoys solving complex technical problems, working across the full software lifecycle, and supporting software in production.

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, build and maintain scalable, reliable and efficient frontend solutions.
• Contribute to technical design and implementation decisions, ensuring solutions align with engineering standards and architectural principles.
• Develop and improve shared platform capabilities, tooling and developer experience.
• Collaborate with engineers, product partners and designers to deliver high-quality software.
• Support, troubleshoot and optimise applications in production, investigating issues across frontend, API and cloud environments.
• Use monitoring and observability tools to identify, diagnose and resolve operational issues.
• Promote good engineering practices including testing, code quality, security and automation.
• Identify opportunities to improve platform reliability, performance and maintainability.
• Share knowledge and support the growth of other engineers through collaboration and mentoring.

What you'll bring

• Strong experience building frontend applications using TypeScript, React, HTML and CSS.
• Experience with modern frontend architectures, including modular or microfrontend-based applications.
• Strong understanding of web technologies, APIs, application architecture and performance optimisation.
• Experience with automated testing tools such as Playwright and Jest.
• Experience with CI/CD pipelines and modern software delivery practices.
• Experience supporting and debugging applications in production environments.
• Hands-on experience using observability and monitoring tools such as Datadog, CloudWatch or similar platforms.
• Practical experience with AWS services such as Lambda, API Gateway, S3, Valkey and CloudFront.
• Strong problem-solving and troubleshooting skills.
• Excellent communication and collaboration skills.
• Excellent command of English (written and spoken)