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How Fimple Built a Secure Mobile App Factory for Banks and Financial Institutions with Appcircle
Explore how Fimple leverages Appcircle to build mobile banking applications while enabling secure, isolated workflows for banks and financial institutions.
Overview
Fimple is a product focused company delivering cloud native core banking solutions for banks and financial institutions. Established in 2022, Fimple helps financial sector players design, configure, and launch modern banking products using a composable finance approach built on SaaS architecture and cloud native microservices.
With its API first platform, Fimple enables banks and financial institutions to rapidly develop and reconfigure financial products while maintaining flexibility, security, and scalability. To support this model at scale, Fimple needed a mobile app delivery strategy that could match the same principles across multiple client organizations.
This requirement led Fimple to adopt Appcircle as the foundation for building, distributing, and securely delivering mobile applications to banks and financial institutions.
With Appcircle, we established a secure mobile app factory model tailored for banks and financial institutions. By building from a single codebase with bank specific configurations, we can securely deliver customized applications to multiple partner organizations, where each app is automatically re-signed and fully isolated. This ensures clear ownership, strong security boundaries, and independent testing and publishing for each bank. Today, we are able to onboard new clients faster while meeting strict compliance requirements.
Mustafa GĂĽneĹź
CEO, Fimple TĂĽrkiye
Challenges
Delivering mobile banking applications for multiple financial institutions from a shared codebase introduces significant operational complexity and strict security requirements. Fimple needed a scalable model that would allow granular customization, isolation, and ownership for each bank, without compromising delivery speed or exposing internal systems.
At the same time, each bank operates as an independent organization with its own testing workflows, publishing responsibilities, and compliance obligations. This made it essential to establish clear boundaries between organizations while maintaining a seamless and automated mobile delivery process.
Fimple develops Flutter based mobile banking applications for multiple banks. While the core application logic and design are shared, each bank requires:
- Environment specific configurations: Each bank operates with its own environment variables to support customized features, integrations, and deployment settings.
- Bank specific branding and application visibility: Although the underlying codebase is shared, each application must reflect the bank’s own branding, identity, and user experience.
- Independent testing and publishing control: Banks need full ownership of internal testing workflows and app store publishing processes within their own organizations.
- Strict organizational isolation: Each bank must remain fully isolated from other banks and from Fimple’s internal CI/CD pipelines to meet security and compliance expectations.
At the same time, strict security and compliance requirements meant that:
- No access to source code or pipelines: Banks could not be granted visibility into Fimple’s source code or CI/CD infrastructure.
- Isolated signing assets and credentials: Certificates, keys, and store credentials had to remain fully separated between organizations.
- Publishing under the bank’s own identity: Applications needed to be released using each bank’s own app store accounts and signing identities.
Solution: A Secure and Scalable Mobile App Factory with Appcircle
Fimple uses Appcircle to power a secure mobile delivery model for banks and financial institutions, enabling scalable delivery without exposing source code, pipelines, or credentials.
- Single codebase, multiple banks: A shared Flutter codebase generates bank specific applications through environment based configurations, allowing consistent development with flexible customization.
- Centralized build, isolated delivery: Applications are built within Fimple’s Appcircle organization and securely delivered to each bank’s independent organization via API, without granting access to CI/CD pipelines.
- Automatic re-signing and ownership transfer: Binaries are automatically re-signed using each bank’s own certificates and keys, ensuring clear ownership boundaries and zero credential sharing.
- Independent testing and publishing: Banks fully control internal testing, distribution, and app store publishing within their own Appcircle organizations, using their own identities and store credentials.
A Strategic Partnership Accelerating Mobile Banking Innovation
Fimple and Appcircle formed a strategic partnership to accelerate the delivery of secure, scalable, and high performing mobile banking applications for banks and financial institutions. By combining Appcircle’s mobile focused DevOps capabilities with Fimple’s composable core banking platform, the partnership enables faster and more reliable mobile app delivery across complex enterprise environments.
Appcircle provides the automated CI/CD foundation required to build, test, distribute, and publish mobile applications at scale, while Fimple focuses on delivering flexible, API driven banking capabilities. Together, this integrated approach eliminates operational bottlenecks, reduces delivery risk, and ensures strong security and compliance boundaries between organizations.
As a result, banks and fintech partners working with Fimple can onboard faster, streamline their mobile app delivery processes, and confidently deliver modern, secure, and high quality mobile banking experiences to their customers.
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