Describe the approach used in creating and configuring a customer relationship management system.

When creating and configuring a Customer Relationship Management (CRM) system, the following approach was usually applied:

1. Requirements analysis — gathering and documenting business and user needs.

2. Architecture selection — determining whether the system will be monolithic, modular, or microservices.

3. Database design — creating a data model reflecting customers, deals, interactions, etc.

4. Development of core modules — such as contact management, interaction history, reports.

5. Integration with external systems — email, telephony, ERP, etc.

6. Configuration of user roles and access rights — to ensure security and function segregation.

7. Testing and optimization — verifying functionality and performance.

8. User training and deployment — preparing documentation and training staff.

In C#, modern design patterns were used for implementation, such as Repository for data access, Dependency Injection for managing dependencies, and Entity Framework for database operations.