What was the main goal of this telecom system development?

The goal was to create a stable, high-performance monolithic system for telecom product management, capable of handling high loads while integrating complex calculations, eligibility rules, and inter-product relationships.

How did Azati ensure system stability under high load?

Azati optimized cache performance, modularized the monolithic service into interconnected functional modules, and conducted extensive testing to ensure reliability and smooth operation under heavy usage.

What modules were included in the system?

The system included Customer Balance Calculation, Product Eligibility Rules, Core Processing, Product Relationship Calculation, and VAS Services Integration modules, each performing specialized tasks to ensure accurate and efficient product management.

What benefits did the client achieve with this solution?

The client experienced improved system reliability, faster response times, enhanced user experience, automated VAS integration, and a modular architecture that supports future scalability and easier maintenance.

Building a Resilient Monolithic Service: Optimizing Telecom Product Management

Azati developed a robust monolithic system with multiple interconnected modules for managing customer products in the telecom industry. The project focused on optimizing cache performance, integrating VAS services, and enhancing user experience under high loads.

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15-20%

faster cache warm-up after deployments

30-45%

reduction in support tickets related to product eligibility

40-55%

improvement in stability under high load

All Technologies Used

Spring

Spring Kafka

Liquibase

Kotlin

Java

Mockito

Groovy

RabbitMQ

Motivation

The telecom provider faced unreliable product-management operations: slow balance calculations, unpredictable product eligibility results, and unstable VAS integrations caused customer dissatisfaction and operational overhead. The client approached Azati to redesign the backend into a resilient, high-performance monolithic system that could process complex telecom logic, withstand high load peaks, and reduce errors in product activation workflows.

Main Challenges

Access to several core systems required approval and routing through a dedicated internal department, causing delays during integration and testing. These slowdowns created development bottlenecks and interfered with maintaining stable delivery velocity. Azati streamlined communication workflows and established structured coordination practices, minimizing the impact of these delays on development efficiency.

Telecom products often have layered compatibility rules, bundled dependencies, upgrade/downgrade logic, and cross-product restrictions. Managing this complexity within legacy business logic frequently caused inconsistent results and incorrect product eligibility outcomes. Azati introduced modular separation of responsibilities and standardized computation models to ensure predictable and accurate processing of product relationships.

The existing system experienced long cache warm-up times and inconsistent cache behavior during peak traffic. This resulted in slow calculations, delayed product activation, and poor user experience. Azati implemented optimized cache strategies and redesigned warm-up mechanisms, ensuring stable performance and reduced latency after deployments or restarts.

Our Approach

Structured Onboarding and Workflow Management

Azati conducted in-depth onboarding, domain interviews, and daily stand-ups to synchronize the team with the client’s architecture and processes. Workflows were supported with specialized task-tracking tools, enabling precise prioritization, transparent progress monitoring, and fast issue resolution.

Git Flow Workflow

A structured Git Flow branching model was implemented to ensure stability across multiple development streams. Mandatory code reviews, staging environment validations, and regression checks guaranteed high-quality deployments to production.

Modular System Development

Azati developed a monolithic system composed of well-isolated modules, including balance calculation, eligibility rules, product relationship logic, VAS integration, and core processing. This approach preserved monolith simplicity while enabling clear boundaries, maintainability, and future scalability.

Extensive Testing

The team created a comprehensive integration test suite covering new functionality, existing flows, and cross-module interactions. This provided a robust safety net for future changes, reducing regression risk and improving long-term system stability.

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Solution

Real-Time Balance Calculation

This module provides real-time, accurate calculation of customer balances by processing numerous transactions and ensuring up-to-date account information is always available for other system components and customer-facing applications.

Key capabilities:

Immediate processing of multiple concurrent transactions
Accurate and synchronized balances across services
Minimized errors during high-load scenarios

Eligibility Rules Engine

Determines whether customers are eligible for specific products or services based on subscriptions, profiles, and promotional rules. This ensures correct product assignments and prevents invalid configurations.

Key capabilities:

Automated eligibility determination based on dynamic rules
Prevention of incompatible product activation
Support for complex promotional and subscription scenarios

Core Processing & Coordination

Acts as the backbone of the monolithic system, coordinating interactions between modules, processing essential business logic, and ensuring consistent and reliable system behavior under high loads.

Key capabilities:

Orchestration of inter-module operations
Stable performance under high-load conditions
Ensures accurate data propagation across modules

Product Relationship Management

Manages dependencies and bundled offers among various customer products, ensuring proper interactions and consistent application of business rules across all services.

Key capabilities:

Management of product bundles and dependencies
Support for multi-level product hierarchies
Prevents logical conflicts across services

VAS Integration Layer

Seamlessly integrates Value-Added Services into the telecom platform, automating activation and configuration to enhance customer experience and reduce manual intervention.

Key capabilities:

Seamless integration with external VAS platforms
Automated activation and monitoring of services
Reduced manual effort and fewer activation failures

Business Value

Improved System Reliability: The monolithic service delivered stable and predictable performance under high-load conditions, minimizing downtime and errors.

Enhanced User Experience: Optimized balance calculations, eligibility checks, and product management ensured smoother interactions for customers.

Operational Efficiency: Automated VAS integration and modular design reduced manual work and simplified maintenance for internal teams.

Scalability and Maintainability: Modular architecture allows future enhancements and extensions without impacting existing services.

Faster Response Times: Optimized cache and core processing modules improved system responsiveness, leading to better performance under peak usage.

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