You have passed your AZ-104 or AZ-204. You’ve proven you understand how to build and manage infrastructure or applications in Azure. Now, it’s time to claim the ultimate prize in the Microsoft cloud ecosystem: the DevOps Engineer Expert badge.
To get it, you must pass the AZ-400 exam.
If you are expecting an exam that just asks you which button to click in the Azure portal to deploy a server, you are in for a shock. The AZ-400 is a uniquely challenging exam because it is just as much about people and processes as it is about technology.
Exam Deep Dive: A Focus on Process and Pipelines
The official title of the certification is telling: "DevOps Engineer Expert." Microsoft expects you to be an expert in the entire software development lifecycle (SDLC).
While you definitely need to know Azure services, this exam tests your ability to design and implement strategies for collaboration, code, infrastructure, source control, security, compliance, continuous integration, testing, delivery, monitoring, and feedback.
Here are the critical areas you must master:
- Source Control Strategies: You will be tested heavily on Git. Not just git commit, but complex branching strategies. When should a team use Trunk-based development versus GitFlow? How do you enforce branch policies (like requiring a minimum number of reviewers before a pull request can be merged)?
- Continuous Integration (CI): How do you automate the building and testing of code every time a developer commits? You need to know how to manage build agents (Microsoft-hosted vs. self-hosted) and how to integrate code quality tools like SonarQube.
- Continuous Delivery (CD): How do you safely push that code to production? You must understand release strategies—especially Blue/Green deployments and Canary releases—and how to use approval gates to pause a deployment until a manager signs off.
- Site Reliability Engineering (SRE): The exam covers how to manage system health. You need to understand concepts like Service Level Indicators (SLIs), Service Level Objectives (SLOs), and how to create actionable alerts.
Understanding the Azure DevOps & GitHub Ecosystem
To pass the AZ-400, you have to realize that Microsoft essentially has two flagship DevOps platforms, and you need to know both.
- Azure DevOps (ADO): This is Microsoft's legacy, enterprise-grade suite. It is a massive, all-in-one platform that includes:
- Azure Boards: For Agile project management and Kanban boards.
- Azure Repos: For Git repositories.
- Azure Pipelines: The CI/CD engine.
- Azure Test Plans: For manual and exploratory testing.
- Azure Artifacts: For hosting your own NuGet, npm, or Maven packages.
- GitHub: Since Microsoft acquired GitHub, they have been aggressively pushing its enterprise features. The exam now heavily tests:
- GitHub Actions: GitHub's native CI/CD pipelines (which are very similar to Azure Pipelines).
- GitHub Advanced Security: Features like secret scanning, dependency scanning (Dependabot), and code scanning to find vulnerabilities before they hit production.
The Exam Reality: You will be asked questions where you have to decide whether to use an Azure DevOps feature or a GitHub feature to solve a specific enterprise problem. You must be fluent in both.
How AZ-400 Differs in Philosophy from AWS DevOps Pro
If you read Chapter 6 about the AWS DevOps Professional (DOP-C02), you might be wondering how the two compare. The philosophies are surprisingly different.
- AWS DOP-C02 is strictly "AWS-Native." It tests your ability to use AWS services (CodePipeline, CloudFormation, Systems Manager) to solve problems. It is highly technical and service-specific.
- Azure AZ-400 is "Tool-Agnostic" and Process-Heavy. Microsoft acknowledges that enterprises use a mix of tools. The AZ-400 will ask you how to integrate Jenkins, Chef, Puppet, Ansible, and Terraform into an Azure DevOps pipeline. It will ask you about managing technical debt and fostering a DevOps culture.
In short: The AWS exam tests if you are a master of AWS automation. The Azure exam tests if you are a master of DevOps principles who happens to be using Azure.
How to Prepare
- Get Hands-On with ADO and GitHub: You cannot pass this exam by just reading Microsoft Learn. Create a free Azure DevOps organization and a free GitHub account.
- Build a Pipeline: Write a simple web app, put it in GitHub, use GitHub Actions to build a Docker container, push it to Azure Container Registry, and use Azure Pipelines to deploy it to an Azure App Service.
- Understand the "Why": When studying, don't just memorize how to set up a branch policy. Understand why an enterprise would require one (e.g., to enforce code reviews for compliance reasons).
Passing the AZ-400 and earning your Expert badge makes you incredibly valuable to Fortune 500 companies and enterprise IT departments. It proves you can bridge the gap between management processes and technical deployment.
But what if you want to work on the cutting edge of open-source, data, and Kubernetes? In Part 4, we explore the final hyperscaler: Google Cloud Platform (GCP).
This book is write-in-progress.
Visit next week to read the next chapter.