Klarna
Senior Backend Engineer -Kafka Platform
SeniorStockholm, SwedenData Streaming
Our Take
Develop and operate Klarna's shared Kafka clusters handling 125 TiB of data across Stockholm or Milan.
What you’ll do
- Develop and operate shared Kafka clusters
- Lead design of core data streaming systems
- Drive architectural decisions across Klarna's data landscape
- Deliver projects and integrations with minimal oversight
What they’re looking for
- Experience running streaming platforms on AWS
- Hands-on with Python
- Distributed systems experience
- Infrastructure-as-code using Terraform and Ansible
As posted by Klarna
What You'll Do Develop, operate and maintain Klarna's shared Kafka clusters — ~150 nodes, 60 MiB/s ingestion, 120 MiB/s output, 125 TiB stored. Lead the design and implementation of core data streaming systems using Kafka, AWS, Iceberg, ECS, and S3. Drive architectural decisions with a clear view of Klarna's data landscape, downstream consumers, and cross-team dependencies. Derive technical requirements from the broader organization and deliver projects and integrations with minimal oversight. Lead technical work in cross-team initiatives. What You Are Experienced building and running streaming platforms on AWS, including EC2 clusters and S3. Hands-on with Python, distributed systems, and infrastructure-as-code using Terraform and Ansible. Familiar with SSO, IAM, and AWS account setups for data platforms — able to balance security with ease of use for developers. Comfortable operating systems in production and improving them through monitoring, incident learnings, and iteration. Focused on building solutions that last and scale, not just solving the immediate problem.