O2 Family

Modern client zone for a superior user experience

Development
Laptop with preview login page to O2 Family client zone and mobile phone with service overview screen.

Project brief

O2 Family, a virtual cellular operator, needed to radically modernize its client zone web application. Their existing system was outdated and did not meet the growing demands for performance and functionality. Since customers manage their services and billing through this platform, a change was essential. The slow, complex system was frustrating customers and could lead to losing them due to poor functionality.

Services provided

Modern client zone development
In-depth API analysis and optimization
Service containerization for flexibility
Advanced security implementation

Our approach

The client knew they wanted to modernize the platform. To determine which problems to address, we first had to thoroughly analyze the system and uncover its specific limitations.

We decided to address the following issues:

  • An outdated architecture that prevented further development.
  • Slow import of invoices that took tens of hours.
  • Inefficient use of APIs, leading to slow response times.
  • Outdated technology that increased security risks and complicated maintenance.
  • Frequent outages and timeouts that negatively impacted user experience.

We then designed and developed a new application with modern architecture and technologies. We optimized the API for more efficient communication and chose an architecture based on containerizing individual services.

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Execution

During the development process, we focused on security, performance, and user-friendliness. Our team implemented two-factor authentication and data encryption, performed thorough penetration testing, and deployed the system with minimal downtime. The new system was designed to support CI/CD processes and be easily scalable.

Outcome and benefits

Our solution met and, in most cases, exceeded the client's requirements:

  • System responsiveness: Response time was reduced to 60-300 ms, averaging 120 ms under a load of 1000 requests per second.
  • Invoice import: On average, the import time has been reduced to under 5 minutes.
  • Development efficiency: The time required to develop new functionality has been reduced by more than 25 times.
  • Testing and deployment: The application is 70% covered by unit and integration tests, covering 100% of the business logic. It passed penetration tests without reproach and meets security "best practice." It supports CI/CD processes with a maximum downtime of 3 seconds.

O2 Family client zone users can now manage their services and billing more efficiently. The system is faster and more user-friendly. The entire platform is more stable, scalable, and, above all, ready for future development. Our client can, therefore, be sure that it is providing its customers with the best possible user experience that does not hinder its development but, on the contrary, helps it grow further.

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