Securely empower your finances with crypto prepaid cards

Client Website:
Client Services: Financial Technologies, Blockchain, Cross-platform mobile application, iOS, Android, Mobile development, Ruby, Azure, PCI DSS, Branding, Product development

01. Challenge

CardB is an innovative solution in the fintech and blockchain area.

With the CardB crypto card, users can convert their cryptocurrencies and pay immediately in any Shopping Mall or online. You can top up the card using Binance Pay. CardB virtual card can be added to Samsung Pay and Apple Pay.

As a trusted partner and advisor Teamvoy develops and provides Naming, Logo, Design Guide book, Mobile & Web Applications, Merchant items, and a website for CardB.

The main concept and challenge is:

“Digital asset  regular money”

So, our primary objective was to craft a revolutionary tool empowering cryptocurrency enthusiasts to seamlessly integrate digital assets into their daily routines, transforming it into an effortlessly sophisticated experience.

Here are the three most challenging things in the process of developing a strong and reliable fintech solution:


Strict banking project & Modern, dynamic vision

Mobile Solution

Cross-platform Mobile Application

Security & Compliance

Features of building

02. Solutions: Branding

How to create solid fintech branding?

1. Strong naming

The name is one of the main components of the brand. Naming should be concise and memorable. Even better - when the name has a specific concept.

In the case of CardB, the name is a synthesis of the idiom "Plan B" and the word "Card". Thus, the name symbolizes constant availability as a “Plan B” for your daily transactions at millions of locations worldwide.

2. Clear communication

Since the project involves working with personal data and payments, transparent communication with customers is essential. It is important to build the design of the user interface in such a way that at each new step, the user understands why certain data are taken from him and how they will be used.

At the same time, a challenge arises: How to squeeze a lot of important information into a minimalist modern design? The answer is simple – beta versions. Using the example of beta versions of the application, we understood which information is mandatory, and which functionality can be removed in the next version.

3. Branding, that represents a solid and safe financial system

It is necessary to understand that when we create branding for the field of finance, we have to work directly with the user's idea of a safe and strong financial environment.

In the "CardB" situation, our task was to maintain an ideal balance between a strict banking project and a modern and dynamic design. This is really important since the project is aimed at people who use cryptocurrency services and for whom such a design is familiar.

03. Solutions: Security & Compliance

Let’s talk about the basis of our choice of the backend stack for CardB, as well as delve into important aspects of building a robust and secure financial solution.

For the backend development, Teamvoy has chosen the following stack: Ruby on Rails with GraphQL

So, why Ruby?

Flexibility and Scalability

Regardless of whether it is monolith or microservices, Ruby on Rails allows programmers to quickly modify code and add new features that meet their needs.

Speed and time to market

The main advantages are speed, built-in tools for testing, and high productivity. Put simply, RoR enables developers to rapidly create high-quality web applications.

Features of building a reliable financial solution:

  • Cloud-based tokenization platform

CardB does not store card data locally but utilizes the best solutions of a payment infrastructure leader in this area. Teamvoy has implemented this solution to ensure the highest level of security. This method prevents potential loss of user data in case of hacker attacks since we only store tokens.

  • Azure – Autoscaling & load balancing

Teamvoy chose Azure as a safe cloud platform that is optimal for the needs of CardB from the cloud & geographical perspective. Azure offers services that comply with multiple compliance programs, including ISO 27001:2005.
Auto-scaling & load balancing are used to scale up and distribute incoming traffic across multiple targets automatically.


Our commitment to security is underscored by our successful passage through PCI-DSS certifications, ensuring the highest standards of data security
The PCI DSS (Payment Card Industry Data Security Standard) is an information security standard designed to reduce payment card fraud by increasing security controls around cardholder data.

  • Global KYC Checks

Utilizing advanced technology, our Know Your Customer (KYC) checks are thorough, efficient, and user-friendly.

  • UFX Way4 – Core Banking interface

Teamvoy adopts this data transfer protocol due to its enhanced reliability and structured framework, particularly critical within the financial sector.

04. Solutions: Cross-platform mobile app

So, why Cross-platform?

  • Wide Audience Coverage

Cross-platform applications can be used on different devices, allowing to reach a larger user audience.

  • Resource Efficiency

Instead of developing separate versions for each platform, one code can be created to work across all of them.

  • Simplified Development Process

Using cross-platform tools and frameworks can streamline development since you don’t have to deal with platform-specific details.

  • Third-Party Tools Integrations

Depending on the region or regulatory requirements different tools can be easily and securely integrated into React Native App. Eg. AML/PEP checks for clients

  • Ease of Use

Cross-platform applications can provide a consistent user interface across different devices, making it easier for users to transition between them.


React Native & Cross-platform applications:

In our approach to developing cross-platform applications, we leverage React Native.

React Native’s popularity in cross-platform mobile development stems from its incorporation of native components, facilitating high-performance applications that closely mimic native ones. The framework promotes code reusability between iOS and Android, streamlining development and allowing simultaneous implementation of changes or updates. With a robust community, extensive third-party libraries, hot reloading for rapid development, cost-effectiveness through shared code, and consistent updates, React Native emerges as a powerful, user-friendly tool for building top-quality cross-platform mobile applications.

05. Impact

– Onboarded 40000+ users during first 2 months

– Performed 3 marketing launch campaigns

– 10000 new users in 5 hours – the most intense campaign

– The rate of app is 4+ in the Apple App Store

06. Want to know more?

Your roadmap to build fintech excellence begins here.
Have a question or want to discuss a potential collaboration?
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