Senior Backend Engineer

<h5>Be a part of the next big thing</h5><p>Do you thrive on tackling complex challenges? Are you passionate about creating impactful solutions that drive commerce forward? Are you someone who believes in encouraging and elevating those around you? </p><h5>About us</h5><p>Kustom, formerly known as Klarna Checkout (KCO), is the Nordic market leader in digital checkout solutions. Today, we support over 24,000 merchants across more than 170 countries, providing a streamlined checkout experience. We offer localized solutions in 18 markets, tailored to specific languages, currencies, and payment methods. No matter where your business operates, we deliver a checkout experience that meets the needs of both merchants and shoppers - driving growth globally. 🌍<br></p><h5>The role</h5><p></p><p>We are looking to hire a Backend Engineer to join our development team. In this role, you will be responsible for designing and implementing robust server-side solutions using modern technologies and frameworks. You will work closely with product managers and fellow engineers to deliver high-performance, scalable applications that power our core business infrastructure.</p><p>As an integral part of our development team, you'll play a crucial role in developing and maintaining our essential backend infrastructure. We need a detailed oriented person who can design and implement efficient, future-proof solutions for complex business problems. Your knowledge and vision will be instrumental in building a solid technical foundation that ensures our product remains reliable and performant as we grow.</p><p>Here at Kustom, you'll get to drive innovation, and leave your mark on our technical architecture. As part of our cross-functional Agile team, you'll collaborate with talented peers to create digital products that revolutionize how merchants worldwide conduct their business.</p><p>Our engineering teams are based in Stockholm, where we prioritize in-person collaboration at our office to foster strong team dynamics.</p><p></p><h5>Things you'll be doing</h5><ul><li><p>Implement scalable, high-performance backend services that power our global payment infrastructure</p></li><li><p>Lead technical discussions and mentor junior team members while contributing to architectural decisions</p></li><li><p>Drive engineering excellence through code reviews, best practices, and technical documentation</p></li><li><p>Work closely with Product and Design to implement robust technical solutions</p></li><li><p>Contribute to our technical roadmap and help shape the future of our platform</p></li></ul><h5>Skills and experience you'll need</h5><ul><li><p>Bachelor’s degree in Computer Science, Engineering, or a related field.</p></li><li><p>7+ years of professional experience in Backend development, with deep expertise in Java</p></li><li><p>Strong track record of designing and implementing large-scale distributed systems</p></li><li><p>Advanced knowledge of Spring Framework and Spring Boot</p></li><li><p>Extensive experience with AWS cloud services and microservices architecture</p></li><li><p>Expert-level understanding of database design, optimization, and various storage solutions</p></li><li><p>Proven experience with Git and Github for version control and team collaboration</p></li><li><p>Deep understanding of RESTful APIs, API security, and performance optimization</p></li></ul><h5>We believe you'll thrive in this role if you have</h5><ul><li><p>Strong technical leadership skills with a track record of mentoring junior engineers</p></li><li><p>Passion for solving complex engineering challenges and driving technical innovation</p></li><li><p>Experience with high-throughput, low-latency systems is a plus</p></li><li><p>Excellent communication skills and ability to explain complex technical concepts clearly</p></li><li><p>Track record of driving technical initiatives and improving system architecture</p></li><li><p>Strong commitment to code quality, testing, and technical documentation</p></li><li><p>Ability to balance technical excellence with practical business needs</p></li></ul><h5>Benefits </h5><ul><li><p><strong>Secure your future</strong> with a competitive pension package, including both national and occupational pension contributions.</p></li><li><p><strong>Comprehensive health coverage</strong> with extensive health insurance, long-term illness protection, and flexible salary exchange options.</p></li><li><p><strong>Invest in your wellbeing</strong> with an annual wellness allowance of <strong>3,000 SEK</strong> to spend on the activities that keep you healthy and energized.</p></li><li><p><strong>More time to enjoy life</strong> with an extra day off when major holidays, such as Christmas Eve or New Year’s Eve, fall on a weekend.</p></li></ul><h5>A place to grow</h5><p>At Kustom, you’re not going to be just another face in the crowd. This is a place where we elevate each other and celebrate success as a team. We believe in our ability to create excellence — and have fun doing it!</p><