Erik Stenman is a senior software architect and founder of Happi Hacking, a consultancy focused on building scalable, robust backend systems for fintech and regulated industries. He was an early technical leader and CTO at Klarna, where he helped scale the platform from startup to large-scale international operation. Erik has over 25 years of experience with distributed systems, high-throughput payments, and the BEAM ecosystem, and is the author of The BEAM Book. Today, he works with teams on architecture, performance, and long-term technical sustainability.