Tell us about the most complex technical project — banking integration. How was the architecture organized?

In the banking integration project, the key was ensuring security, reliability, and scalability. The architecture was built on a microservices principle, where each service was responsible for a specific function: authorization, payment processing, customer data management, logging, and monitoring.

An adapter layer was used to interact with the bank, encapsulating the specifics of banking APIs (SOAP, REST, messaging protocols). This allowed easy changes or additions of new banks without affecting the business logic.

An important element was the message queue (e.g., RabbitMQ or Kafka) for asynchronous transaction processing and increased fault tolerance. All critical operations went through transactional mechanisms with rollback on errors.

Security was ensured through data encryption, two-factor authentication, and strict access policies. Logging and monitoring enabled quick detection and resolution of issues.

An example of a simplified architecture:

• API Gateway
• Authorization Service
• Payment Processing Service
• Banking API Adapter
• Message Queue
• Logging and Monitoring Service

This approach provided flexibility, security, and scalability of the solution.