Bjørn Reppen

I've spent 30+ years building and rescuing systems that cannot fail, including the core premium, invoicing, and securities domains of a terabyte-scale defined-contribution pension system for Vital, DNB, Accenture, and Betatech. When production data corruption occurred, I debugged, reconstructed, and reconciled it—and built the characterization, randomized regression, and database upgrade tooling that proved changes were safe.

At Elekt, I was sole developer for React Native power-monitoring apps used by more than 1.3 million people in Norway and Denmark, alongside Azure Functions APIs and real-time consumption-data ingestion. At Volue, I delivered map-based decision support for field electricians and replaced a server backend with static cloud-native delivery on Azure Blob Storage; at Sticos, I modernized a seven-year-old accounting codebase and shipped its first end-user LLM integration.

Through Betatech, I deliver agentic AI workflows safely inside audited legacy cores, leaving clients with golden-master rigs that replay historical cases and verify results to the last krone. I also build products end to end, including solrapport.no, using Rust, national lidar data, GPU solar simulation, PDF generation, Vipps payments, and operational support.