Gain insights into implementing practical software architectures, mastering key development methodologies, and distinguishing core principles, ensuring your skills remain relevant in the ever-evolving industry.

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Non-readable code? Non-practical architectures? Unclear requirements? Are you pulling your hair at this point?

These are exactly the sort of pitfalls this course serves to provide in-depth remediation for. Over your years of working in the software industry, numerous day-to-day challenges like these come and go. While the industry has been constantly transforming, some core principles and values remain amidst the advancing technologies. 

Through tried and tested approaches, you will learn how to practically implement 'Effective Software'. With a comprehensive compilation of key concepts in software development methodology, you will be left with essential techniques for becoming a better software craftsman. It is time to distinguish between the core and the noise, making your skills timeless!

Effective Software Development for Enterprise Applications

The **Command and Query Responsibility Segregation (CQRS)** pattern separates the "write" data model and the "read" data model for a data store, as visualized above.

While I do not intend to explain the [CQRS](https://martinfowler.com/bliki/CQRS.html) pattern from scratch, I want to give a couple of hints for implementing solutions while applying this pattern.

* Combine CQRS with rich domains for the best results. Earlier, I explained what a rich domain is (see the [lesson](https://www.educative.io/collections/page/10370001/4898915302768640/4928484399382528)), which is a preferred form of implementing domain layers of software
systems. Now I want to recommend that you use both patterns when applying the CQRS pattern to the solution.

* Query objects (a.k.a. read models) are also part of a rich domain. While mentioned objects sound like data containers, they are a result of extraction from domain entities. In other words, domain entities are a source of truth when generating query objects out of them.

* Query object composition is a domain concern. If your application relies on the read models for displaying data on a screen, then probably the correctness and consistency of those models are essential for your software system. Such a vital problem needs to be part of the domain whenever possible.

* Represent three classes of problems in the domain layer; entities, query objects, and transformation operations between them. Highlight ones that have critical importance to success. Usually, when you go with the CQRS pattern, it is probably the case that all three are vital for your solution.

Let me distill everything that I suggested above to help you do it in practice.

Learn how to implement solutions using the command query responsibility segregation pattern.

Fundamentals

Part I: Introduction

Part II: Crosscutting Concerns

Part III: From Customer Insights to Internal Requirements

Part IV: Design and Architecture

Part V: Implementation and Coding

Part VI: Testing and Quality Assurance

Part VII: Deployment

Part VIII: Maintenance and Support

Wrap-Up

Command Query Responsibility Segregation (CQRS)