Case Study: Solarisbank scales cloud-native lending and enables international expansion with Mambu

Mambu enables Germany’s first fully cloud bank

solarisBank, Europe’s leading Banking‑as‑a‑Service platform, faced a critical challenge: its modular, cloud‑native core needed a loan booking/customer account subledger that could scale horizontally and handle rapidly growing partner volumes. The previous provider limited concurrent loan creation and daily throughput, so solarisBank selected Mambu’s API‑enabled, cloud‑native loan subledger (deployed on AWS) to meet its scalability and integration requirements.

Mambu delivered a configurable, API‑first platform with a fast rollout (planning Jan 2020, implementation Apr 2020, go‑live Oct 2020; full migration by Q2 2021), enabling solarisBank to create effectively unlimited loans per day, scale horizontally, and integrate with large partners such as Samsung Pay. The result: a smooth four‑month implementation, support for 1,000,000+ customer accounts on a 100% digital architecture, faster product development and international expansion, and reliable handling of their lending load thanks to Mambu.

solarisBank

Jörg Howein

Chief Product Officer