Modernizing Legacy Software for a Leading Telecom Company in Germany

About the Client

The Freenet Group is the largest independent telecom network provider in Germany, serving 8.3 million subscribers with telecommunication, broadband, web, media, and TV services. Its operations are driven by four main brands. Mobilcom-debitel is one of the largest mobile phone service providers in Europe. GRAVIS operates as an authorized Apple reseller in Germany. Klarmobil.de is a mobile virtual network operator offering discounted subscription plans. Lastly, Freenet.de provides free email and cloud services.

Challenge

As an innovative market leader, the Freenet Group quickly recognized the need to upgrade its legacy codebases. The original systems were built on Java 6 and Jboss (WildFly) application servers which no longer met its business needs. 

Edvantis Engineers familiar with the Spring Boot framework, Java 11, and mono and flux libraries were selected to assist Freenet. 

Main Goals

The primary objectives of initiating the collaboration with Edvantis were as follows:

• Preserve the business logic for all the applications
• Migrate application to a new Java 11 and Spring Boot framework.

Solution

The Edvantis team migrated and fully ported 16 legacy services to the new infrastructure in just 12 months. 

Our main goal during migration was to preserve the business logic for all the applications to avoid any operational disruptions. 

In terms of legacy modernization, our engineering team:

• Performed code refactoring and improved its quality within the newer Java 11 version. 
• Upgraded legacy libraries using Spring Boot features. 
• Used a reactive approach to IT system modernization and helped the client migrate to a future-proofed microservices architecture, built on Java 11.

As part of QA services, we delivered:

• Code coverage reports that verified if the migrated biz-logic was fully covered by tests 
• Integration testing to ensure there were no new bugs in the migrated code 
• Static code analysis to double-check that the code is clean and ready-to-be deployed.

Results

Over 12 months, Edvantis helped Freenet Group modernize its operations by transforming outdated systems into a future-ready infrastructure. The migration to a microservices architecture has equipped Freenet to scale effectively, meet growing business demands, and stay competitive in the market.

By ensuring a seamless transition with no disruptions, Freenet now has the agility and resilience to drive innovation and maintain its leadership position in the industry.