Infrastructure Engineer

Be a part of the next big thing

Do you thrive on tackling complex challenges? Are you passionate about creating impactful solutions that drive commerce forward? Do you believe in encouraging and elevating those around you?

About us

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 businesses operate, we deliver a checkout experience that meets the needs of both merchants and shoppers—driving growth globally.

The role

As an Infrastructure Engineer at Kustom, you'll play a key role in building and evolving the platform that powers one of the most trusted checkout solutions in the Nordics. You'll work across cloud infrastructure, data, networking and observability to ensure our systems remain secure, scalable and resilient as we continue to grow.

You'll collaborate closely with engineers across product, backend and data to design solutions that support high availability and low latency. This role is perfect for someone who enjoys solving hard technical problems, driving automation and enabling teams to ship with confidence.

Things you'll be doing

• Designing, building and maintaining scalable cloud infrastructure on AWS to support high-traffic, mission-critical systems
• Managing and improving our Kubernetes environments, ensuring smooth deployments, strong security and reliable performance
• Implementing Infrastructure as Code using Terraform to automate provisioning, configuration and change management
• Enhancing observability across services using Datadog (metrics, tracing, alerting) to ensure fast issue detection and resolution
• Optimizing PostgreSQL databases, including schema design, indexing and performance tuning
• Working with event-driven systems and streaming platforms like Kafka to support real-time data flows
• Collaborating with backend teams to design and deliver resilient architectures and efficient deployment pipelines
• Driving continuous improvements in automation, tooling and reliability across our infrastructure
• Troubleshooting complex production issues related to performance, scaling, networking or distributed systems
• Contributing to documentation, best practices and cross-team knowledge sharing

Skills and experience you'll need

• Bachelor's degree in Computer Science, Engineering or a related field
• Extensive hands-on experience with Amazon Web Services core services (EC2, CloudFront, RDS, S3, etc.)
• Strong expertise in Kubernetes and container orchestration best practices
• Proficiency with Infrastructure as Code (Terraform or similar tools)
• Solid understanding of networking fundamentals (VPC, routing, load balancing, DNS)
• Experience with observability platforms like Datadog for metrics, tracing and alerting
• Solid understanding of PostgreSQL, including schema design, indexing and query optimization
• Familiarity with event-driven architectures and data technologies such as Kafka
• Strong programming skills in Java (Spring Boot)
• Proficient in Git for version control and collaboration

We believe you'll thrive in this role if you have

• Passion for building reliable, automated and secure infrastructure at scale
• Experience managing high-availability, mission critical systems in production
• Ability to diagnose and solve complex performance, networking and scaling challenges
• A track record of driving automation, reducing toil and improving operational efficiency
• Excellent communication skills with the ability to collaborate across teams and explain complex systems clearly
• Strong commitment to infrastructure-as-code, testing and high-quality documentation

Benefits

• Robust pension plan with national and occupational components
• Excellent health insurance coverage, including long-term illness protection and salary exchange options
• Annual wellness allowance of 3,000 SEK to invest in your health and fitness
• Extra day off when major holidays (e.g., Christmas Eve, New Year's Eve) fall on weekends
• Continuous learning opportunities and professional development support

A place to grow

At Kustom, you won't just be 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

We know we set high expectations, but we also know that the road to success isn't a straight line. We support and encourage each other to try, to fail, to try again. Because that's how we grow, individually and together.

Does this sound like the place for you?

About your application

• Please apply in English. At Kustom, we welcome everyone We don't care where you're from, whom you love, or what kind of food is your favorite. We believe in inclusivity for all.
• Given the above, we treat all candidates the same That's why we have this awesome recruitment tool to keep track of all the amazing talents that apply - so please; apply through the system and we'll make sure to keep you updated along the recruitment process. Please note that we can't keep track of CVs or similar documents sent via email.
• We value your privacy When you apply, we'll handle your data with care. Want to know more about how we use your information? Check out our FAQs at the bottom of the jobs page - we've got all the details there for you

---