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Telecommunications 5 months

Modernizing a Digital Online Charging Platform with Enterprise Microservices

A legacy Node.js backend was transformed into a production-ready Java and Spring Boot microservices platform with multi-tenant support, stronger scalability, and more than 90% API unit-test coverage.

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20–25%Less backend development effort
Faster feature development
30%
API unit-test coverage
90%+
Industry
Telecommunications
Engagement
Platform Modernization
Duration
5 months
Modules delivered
6 telecom modules
Engagement model
Technology Expertise & Engineering Delivery

From challenge to solution

The challenge

Legacy backend services had become difficult to maintain and extend. A complex Node.js codebase slowed feature delivery, increased maintenance effort, and lacked the performance and scalability needed to support a new user experience and future telecom services.

  • Complex legacy backend services
  • Slow feature development and high maintenance effort
  • Insufficient performance and scalability
  • Need for standardized enterprise APIs
  • Requirement for multi-tenant capabilities and production readiness

Our approach

TEKNIKOZ designed and delivered a Java and Spring Boot microservices architecture with standardized REST APIs across six telecom modules. The solution introduced Oracle database support, HikariCP connection pooling, Redis caching, dynamic datasource routing for multi-tenancy, automated testing, containerized deployment, and CI/CD readiness.

  • Migrated backend services from Node.js to Spring Boot
  • Designed standardized REST APIs for six telecom modules
  • Implemented dynamic datasource routing for multi-tenancy
  • Improved database efficiency through connection pooling and caching
  • Established comprehensive unit testing and API documentation
  • Prepared containerized, production-ready deployment workflows

The business impact

  • 20–25%Less backend development effort
  • 30%Faster feature development
  • 90%+API unit-test coverage
  • Six telecom modules delivered successfully
  • Multi-tenant architecture implemented with existing-application compatibility
  • Production-ready delivery completed within five months
  • Zero production downtime during implementation

Technology stack

  • Java 21
  • Spring Boot 3
  • Oracle Database
  • HikariCP
  • Redis
  • Swagger / OpenAPI
  • JUnit 5
  • Docker
  • Rancher
  • GitLab CI/CD

Six telecom modules. One scalable service foundation.

  • Network Slice
  • Home Zones
  • Toll Free
  • Token Management
  • Holiday
  • Credit Conversion

Why it matters

Backend modernization is most valuable when it improves both current delivery and future adaptability. A modular, tested, and scalable foundation enables telecom teams to release capabilities faster without increasing operational risk.

The TEKNIKOZ perspective

TEKNIKOZ helps organizations replace hard-to-maintain legacy services with enterprise engineering foundations designed for scalability, testability, and continuous evolution.

The outcome

The engagement implemented multi-tenant support through dynamic datasource routing while maintaining compatibility with existing applications. Six REST API modules reached production readiness with more than 90% test coverage and zero production downtime.

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