Disrupting German banking: inside C24 Bank's rapid rise
As part of CHECK24, Germany's largest product comparison portal, C24 Bank leveraged Mambuβs flexible platform to scale quickly, deliver exceptional customer experiences, and help customers prioritise smarter financial decisions.
- 0
- months to market
- 0x
- account growth YoY since launch
- 4,0/5
- highest rated bank in Germany
C24 Bank
About the customer
C24 Bank, established in 2019 and part of CHECK24 β Germanyβs largest product comparison portal, is a fully regulated and BaFin-approved digital bank focused on customer-centric, transparent banking. With Germany's best checking account, C24 Bank delivers an exceptional user experience, empowering customers to make smarter financial decisions.
The bank provides current accounts, debit cards, loans, and deposit optionsβall accessible through its fully digital mobile app.
- Launched in 2020
- Germany's best Girokonto
- Goal: serve 1 million customers
The challenge
Navigating competition with customer-first banking
In a competitive, heavily regulated market, C24 Bank sought to differentiate itself by focusing on customer needs, offering low-fee, transparent banking with exceptional customer service. To enter the market successfully, C24 needed to build credibility and trust, meet regulatory requirements and ensure reliability and scalability without compromising speed.
With an ambitious goal of launching within 12 months, C24 Bank required a flexible, composable platform to deliver rapid development and an excellent customer experience.
The solution
Driving rapid and scalable growth with Mambu
C24 Bank selected Mambu as its cloud banking partner for its proven expertise in Germany and the region. Mambu's composable approach enabled seamless integration with C24's ecosystem of partners, including KYC, payments, and cards. Deployed on Amazon Web Services (AWS), C24 Bank opted for a soft, organic launch to ensure system stability and set the stage for future growth. Since then, the bank has expanded its offerings from a single current account product to three tailored account models.
The result
Rapid growth and top-tier recognition
C24 Bank went live in 14 months and has since seen significant growth, driven by its customer-first approach and high satisfaction scores. This growth reflects its ability to innovate and scale quickly. The ongoing partnership with Mambu supports expansion through new products and customer-driven solutions, positioning C24 Bank as one of Germanyβs leading digital banks.
- 3x account growth YoY since launch
- 4.8/5 stars: highest rated bank in Germany
- Multiple awards, including best Girokonto and mobile banking app
βThe scalability of Mambuβs platform was essential as our customer base grew. Mambuβs flexibility and the breadth of its product offering meant we could introduce new features quickly, like our interest-bearing current accounts, which have been a game-changer in the German market.β
- Thilo Arnold, Managing Director, C24 Bank
Download the full case study
Download the full case study to see how C24 Bank leveraged Mambuβs platform to scale quickly, deliver exceptional customer experiences, and whatβs next for their continued innovation.
Loading Form
Explore more customer stories
Β© Mambu 2026