Reliable and Scalable Billing System
The implemented solution successfully handled complex billing needs for public organizations and was capable of scaling with growing demand.
Technologies used
Java 8
Spring Boot
Spring Integration
Spring Batch
MySQL Aurora
Asciidoctor
Hibernate
Liquibase
Groovy
Mockito
Git
Docker
Jira
Confluence
Jenkins
Kibana
Motivation
The project aimed to develop a scalable and reliable billing management system for public organizations, automating high-volume invoice processing, integration with payment gateways, and reducing manual errors. The solution focused on operational efficiency, robust financial workflows, and seamless external API integration.
Main challenges
Challenge 01
High-Volume Billing Flow
The system had to efficiently process thousands of invoices in scheduled and event-driven batches. Azati implemented Spring Batch and asynchronous integration patterns to handle large-scale financial operations without downtime or bottlenecks.
#1
Challenge 02
Integration with External Payment Gateway
Handling real-time and asynchronous communications with an external payment gateway required robust error handling and retries. The team implemented Spring Integration flows and retry mechanisms to ensure message delivery and processing.
#2
Challenge 03
Dynamic Business Logic and Data Validations
Business rules varied across clients and had to be validated at multiple stages. Custom validation and calculation layers were developed within the service architecture to ensure accurate billing and compliance.
#3
Our approach
Agile-Based Development Process
The team followed Agile practices with clearly defined roles and processes. This included task estimation (poker board), grooming, retrospectives, and architecture discussions to align development with business goals.
Team Collaboration
Cross-functional team of 4 developers, 2 QA engineers, a team lead, a business analyst, a project manager, and a solution architect worked in close sync with constant communication and Q&A sessions.
Code Quality and Review Culture
Senior backend engineers participated in writing business-critical code, reviewing changes, optimizing SQL queries, negotiating API contracts, and improving database structures for better scalability.
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01
Batch Invoice Processing Module
Handles scheduled and event-driven execution of large invoice flows, including payments, deposits, settlements, and retries. Designed to process thousands of invoices daily while maintaining system performance and reliability, crucial for high-volume banking operations.
Key capabilities:
- High-volume batch processing using Spring Batch
- Retry mechanisms for failed transactions
- Automated payment settlements and reconciliation
02
Payment Gateway Integration Module
Manages secure, asynchronous communication with external payment systems and banking networks. Ensures reliable processing of transactions with minimal downtime, providing real-time updates and automated error recovery to support financial compliance and operational continuity.
Key capabilities:
- Message-based integration for non-blocking communication
- Error handling and automatic retries
- Real-time payment status updates
03
Business Logic & Validation Module
Implements complex client-specific billing rules, multi-stage validations, and financial workflows. Ensures accuracy, regulatory compliance, and flexibility to accommodate diverse banking requirements, minimizing risk and errors in billing and payment processes.
Key capabilities:
- Multi-stage validation for invoices and payments
- Custom calculations for different client rules
- Ensures compliance and accurate billing operations
04
REST API & Integration Layer
Exposes CRUD and reporting operations for billing entities, enabling seamless integration with external services, mobile/web applications, and internal banking systems. Supports secure and efficient data access while maintaining scalability and system stability.
Key capabilities:
- Create, read, update, delete operations for billing and payment entities
- Filter, sort, and search functionality for comprehensive data access
- Supports integration with internal banking systems and third-party services
Results & business impact
Improved Integration with Payment Gateways
Enabled seamless and secure money transfers, settlements, and automated payment retries through robust integration.
Optimized Business Processes
The automation of key billing processes reduced manual overhead and errors, thereby increasing overall efficiency and customer satisfaction.
Stable Operations through Asynchronous Processing
Reduced system downtime and load peaks with asynchronous communication and batch scheduling.
Knowledge-Driven Development
Regular architectural consultations and team rituals ensured high-quality deliverables aligned with long-term system goals.
