Jonas Keller — Senior Backend Engineer
Backend engineer with eight years building data-heavy services for logistics and mobility platforms.
Halden Analytics · Backend Engineer · 2019 – 2025
— Designed and ran Python services on Kubernetes1 handling 40k requests a minute.
— Moved the batch ETL to Kafka streams2, cutting report latency from hours to minutes.
— Mentored two junior engineers3 through onboarding and code review.