1. Agile Model (2000s - Present)

Definition:

The Agile Model is an iterative and flexible software development approach that delivers the product in small, incremental releases. It emphasizes collaboration, customer feedback, and continuous improvement.

Sprint-Based Approach

Click on the below picture for complete breakdown - https://youtu.be/uaRhgiV2AAY

Agile Methodology Cycle

The image represents the Agile SDLC cycle, which includes:

🔹 Plan – Requirements gathering & sprint planning

🔹 Design – Creating system architecture & workflows

🔹 Develop – Writing code in short iterations

🔹 Test – Continuous testing (unit, integration, regression)

🔹 Deploy – Automating deployment with CI/CD

🔹 Review – Collecting feedback & iterating

🔹 Launch – Releasing the product in small increments

Advantages of the Agile Model

• Fast delivery of working software.

• Highly adaptable to changing requirements.

• Encourages continuous customer collaboration.

• Reduces development risks.

• Focuses on high-priority features first.

Sequential Roles from Client to Maintenance:

1. Client / Stakeholder – Gives requirements

2. Business Analyst (BA) – Gathers and documents requirements

3. Product Owner (PO) – Prioritizes features for development

4. Project Manager / Scrum Master – Plans and coordinates the workflow

5. UX/UI Designer – Designs the user interface and user experience

6. Software Architect – Designs the system architecture

7. Developer – Implements features and writes code

8. Build Engineer – Packages the application for deployment

9. QA Engineer / Tester – Verifies functionality and quality

10. Release Manager – Plans and oversees the release process

11. System Administrator Deploys the software

12. Technical Support Engineer – Handles post-deployment issues

13. Maintenance Engineer / SRE (Site Reliability Engineer) – Monitors and maintains the software

"Agile follows sprints to quickly build software. But after the build, should the customer wait to get the feature? No — this is where DevOps helps through automation and continuous delivery."

How Agile connected to DevOps

• Agile focuses on developing software faster through small, iterative cycles.

• DevOps focuses on delivering and operating software faster and more reliably using automation and collaboration.

Up to development roles are same after implementing DevOps

1. Developer –

   • Writes code

   • Contributes to CI/CD pipelines

   • Writes unit and integration tests

2. QA Automation Engineer –

   • Creates automated tests integrated with the pipeline

   • Ensures quality early in the dev cycle

3. DevOps Engineer –

   • Automates build, test, deploy, infra (IaC)

   • Manages CI/CD pipelines, monitoring, logs

   • Ensures security (DevSecOps)

4. Site Reliability Engineer (SRE) –

   • Ensures reliability, scalability, performance

   • Handles incident response, observability, SLAs

5. Support Engineer – Handles post-deployment issues reported by users

Agile Methodologies & SDLC: A Must-Know for DevOps Practitioner

Agile is the backbone of modern Software Development Life Cycle (SDLC), ensuring continuous development, collaboration, and faster delivery. As a DevOps practitioner, understanding Agile helps bridge the gap between development and operations, making CI/CD pipelines more effective.

2010s - Present

DevOps Model

Continuous integration, deployment, and automation.

Finally

• What is DevOps

  • Give the actual meaning of DevOps

    • DevOps is Delivering the software. Better, faster, cheaper.

    • DevOps aims to enhance software delivery: more efficient, quicker, and cost-effective.