Bitcoin.de

The IntexSoft team divided the application development into 3 stages:

1. Prototyping and design;
2. Mobile application development;
3. Testing the application with real data.

The design process started with an analysis of the requirements and the data provided. An MVP was already developed and our team needed to adapt it for Android OS and add the possibility to notify users at the moment when the cryptocurrency rate changed. In addition, the task was to design a quick access flow to buying/selling cryptocurrencies.

UX Process

After studying the requirements, we worked out the solutions using wireframing. After the sketches were ready, we discussed them with the client explaining the pros and cons of each option. Here we focused mostly on the functional part.

Prototyping

Together with the client, we agreed on an option that implies the location of notifications next to each cryptocurrency, as well as the ability to open an additional menu when swiping. Such a solution allowed us to save space for displaying more information, while not overloading the interface and making it user-friendly.

The highest level of security was critical for the project. Our experts have carefully thought it out, developed and tested a high-level security system that prevents:

• password theft;
• third party transactions;
• man-in-the-middle attack.

The scheme also provides:

• binding of the application to the exchange;
• user data input.

By providing secure access to data, our developers have achieved a high level of usability. To access the crypto exchange, the user needs to scan a QR code in a web app once. The code serves as a tool for the simple and quick transfer of keys and passwords as well as for connecting a mobile application to the web service.

The keys to the application belong only to the user, no one can steal access or use a password. These keys provide data encryption and user authentication. If a third party takes a photo of a QR code, the connection will still be impossible.

The IntexSoft team used the AES protocol to establish a secure connection between the mobile application and the server. It’s impossible to decrypt data even when intercepting HTTPS protocols.

The dev team used a WebSocket connection to ensure a permanent connection between the server and the mobile device. It is necessary, in particular, to have the list of available offers updated.

Data protection on mobile devices is provided by biometrics: Touch ID and Face ID.

When working on the project, the classic Waterfall development model was used. It was the most suitable due to clearly defined budget and strict requirements.

During the project, the client could easily reach out to the IntexSoft team to resolve any issue. Our specialists organized video conferences with the client where they discussed possible changes and improvements.