Senior Software Engineer - Java

Join Klarna's engineering community, where you'll be part of a customer-centric community that thrives in collaboration, innovating solutions that continuously redefine the industry.
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About Us
With over 85 million global active users and 2,5 million transactions per day, Klarna is on the way to becoming the world’s favorite way to shop. To help us get there, we’re assembling an unparalleled global talent team—accelerating individual careers, and disrupting entire industries. We’re looking for people ready to achieve the extraordinary and embrace our bold ambitions as we shape the future of payments and fintech. Will you join us?

What You Will Do:

• Develop and maintain Java applications with a focus on scalability, security, and performance.
• Collaborate with cross-functional teams to design, test, and implement new features and services.
• Participate in code reviews, contribute to continuous improvement and operational excellence.
• Support the design and deployment of microservices architectures using Docker and Kubernetes.
• Monitor, troubleshoot, and optimize Java applications for maximum speed and scalability.
• Ensure adherence to software development best practices and contribute to internal and external documentation.
• Share your knowledge and help the team evolve best practices
• Work in small autonomous teams with short release cycles.

Who You Are:

• Proficient in Java (latest version) and Spring and Spring Boot frameworks.
• Experience with microservices architecture and containerization technologies such as Docker and Kubernetes.
• Strong understanding of databases, including relational databases like PostgreSQL and NoSQL technologies.
• Skilled in developing high-quality, well-documented, and testable code.
• Effective team player with strong problem-solving skills and the ability to adapt to changing priorities and deadlines.
• Fluent in English, both written and verbal communication.

Awesome to Have:

• Previous experience in Agile development environments.
• Familiarity with CI/CD tools such as Jenkins and experience with cloud platforms like AWS.

Why Join Klarna?

• Be part of a transformative company driving significant improvements in the financial services industry.
• Work on innovative projects that directly impact user experiences.
• Collaborate with a diverse and talented team in a dynamic, fast-paced environment.
• Enjoy opportunities for professional growth and development within a leading fintech company.

Closing

This position will initially be offered as a contract, providing an excellent opportunity for the right candidate to demonstrate their skills and make a meaningful impact. With proven performance, there is strong potential for this position to evolve into a long-term opportunity within our team. We’re excited to see how you can contribute and grow with us!

Please include a CV in English

Department Engineering Locations Warsaw, Poland Hourly salary 175 - 195 Employment type Contract About Klarna
Since 2005, Klarna has been on a mission to reimagine how consumers spend and save in their daily lives. We help people save time and money and reduce financial worry. With over 85 million global active users and 2.5 million transactions per day, our vision is a world where Klarna empowers everyone, everywhere, through seamless financial and commerce experiences—as a personalized, trusted assistant making financial empowerment effortless.

Over 575,000 global retail partners, including H&M, Saks, Sephora, Macys, IKEA, Expedia Group, and Nike have integrated Klarna's innovative technology to deliver a seamless shopping experience online and in-store.

Founded in 2005 Co-workers 3,800 Turnover $2.5bn Apply! Engineering · Warsaw, Poland Senior Software Engineer - Java
Join Klarna's engineering community, where you'll be part of a customer-centric community that thrives in collaboration, innovating solutions that continuously redefine the industry.