What Is DevSecOps? A Beginner’s Guide to Securing and Automating Your Applications
How to bake security into every stage of your development pipeline — and the certification that proves you can do it.
If you have been working in IT for a while — whether in systems administration, DevOps, or getting your feet wet with a cybersecurity diploma — you have likely heard the word DevSecOps thrown around more and more. It sounds like a buzzword at first. But once it clicks, you realize it is one of the most important shifts happening in tech right now.
I am currently completing a Cybersecurity Analyst Diploma, and the further I go, the more clearly I see how critical it is to build security into the development process — not bolt it on at the end. That is exactly what DevSecOps is about.
This article walks you through what DevSecOps is, why it matters, how to secure and automate your applications using its principles, and what the Certified DevSecOps Professional (CDP) certification looks like for someone wanting to take this seriously as a career move.
What is DevSecOps?
DevSecOps stands for Development, Security, and Operations. It extends the DevOps philosophy by integrating security practices directly into the Software Development Lifecycle (SDLC) — rather than treating security as a final checkpoint before deployment.
Traditional software development used to follow a pattern like this:
- Developers write code
- Operations deploys it
- Security reviews it — sometimes weeks later
- Vulnerabilities are found
- Everyone scrambles to fix them
This model is slow, expensive, and risky. By the time a security team reviews code, it may already be in production. Fixing a vulnerability at that stage costs significantly more time and money than catching it during development.
Why DevSecOps matters right now
The DevSecOps market is projected to grow from $8.84 billion in 2024 to between $20 billion and $32 billion by 2030. For IT professionals, this is not a trend — it is a fundamental change in how modern software gets built and secured.
The core pillars: people, process, and technology
DevSecOps is built on three pillars that mirror the DevOps CAMS principles — Culture, Automation, Measurement, and Sharing.
People (culture)
Security becomes everyone’s responsibility, not just the security team’s job. Developers learn to write secure code. Operations learns to deploy securely. This cultural shift is often the hardest part of any DevSecOps transformation.
Process (Secure SDLC)
Security activities are mapped to each phase of the Software Development Lifecycle:
- Requirements — Define security requirements upfront
- Design — Perform threat modeling to identify what could go wrong
- Implementation — Run static analysis (SAST) as code is written
- Testing — Run dynamic analysis (DAST) against running applications
- Deployment — Harden OS and web server configurations
- Maintenance — Monitor continuously for new vulnerabilities and ensure compliance
Technology (automation)
Tools automate security checks at every stage so developers are not slowed down and security does not become a bottleneck. This is where the real efficiency gains come from.
How to secure your applications
1. Software Component Analysis (SCA)
Modern applications rely heavily on third-party libraries and open-source components. Every package you pull in is a potential attack surface. SCA tools scan your dependencies for known vulnerabilities — comparing them against public databases like the National Vulnerability Database (NVD).
2. Static Application Security Testing (SAST)
SAST tools analyze your source code without running the application. They catch SQL injection risks, hardcoded credentials, insecure cryptography, and other coding mistakes that lead to vulnerabilities.
3. Dynamic Application Security Testing (DAST)
Unlike SAST, DAST tests your application while it is running. It simulates an attacker interacting with your web app, probing for cross-site scripting (XSS), insecure authentication, open redirects, and server misconfigurations.
4. Infrastructure as Code security (IaC)
If your infrastructure is defined in code — which it should be in any modern DevOps environment — that code needs to be secured too. Ansible automates OS hardening and creates consistent golden server images. InSpec and OpenSCAP let you write compliance checks as code, verifying your infrastructure meets security standards at scale.
How to automate security in your CI/CD pipeline
The real power of DevSecOps is automation. When security checks run on every code commit, you catch problems early without relying on humans to remember to run scans. Here is what a basic DevSecOps pipeline looks like:
Tools like GitLab CI, GitHub Actions, Jenkins, and CircleCI let you define this pipeline as code. Security tools plug in as stages — if a critical vulnerability is found, the pipeline fails and the code does not get promoted. These automated checkpoints are called Security Gates.
The DevSecOps Maturity Model (DSOMM)
Not every organization can go from zero to a fully automated pipeline overnight. The DevSecOps Maturity Model (DSOMM) provides a framework for measuring where you are and planning how to improve.
| Level | Description | What it looks like |
|---|---|---|
| Level 0/1 | Ad hoc security | No automation; security is a manual afterthought |
| Level 2 | Partial automation | SCA + SAST in pipeline; basic vulnerability tracking |
| Level 3 | Comprehensive automation | Security gates across all pipelines; DAST + IaC checks |
| Level 4 | Proactive security | Continuous improvement; org-wide security metrics |
Most organizations target Level 2 as a realistic near-term goal — and that alone puts them ahead of the majority of teams still operating at Level 0/1.
A career path worth pursuing: the CDP certification
If this material resonates with you — especially if you are already in cybersecurity or DevOps — the Certified DevSecOps Professional (CDP) from Practical DevSecOps is one of the strongest credentials you can earn in this space.
Certified DevSecOps Professional (CDP)
Hands-on DevSecOps certification from Practical DevSecOps — trusted by 10,000+ learners worldwide.
What the course covers
Nine chapters take you from DevOps fundamentals all the way through real-world DevSecOps implementation:
- Secure SDLC and CI/CD pipeline design
- SCA, SAST, and DAST integration with hands-on labs
- Infrastructure as Code with Ansible
- Compliance as Code with InSpec and OpenSCAP
- Vulnerability management with DefectDojo
- The DevSecOps Maturity Model (DSOMM)
Prerequisites are minimal: basic Linux command-line knowledge and familiarity with OWASP Top 10. No prior DevOps experience required.
The exam
The CDP exam is a 6-hour practical challenge — five real-world scenarios to complete — followed by a 24-hour report submission window. You demonstrate actual skills, not just test-taking ability. That is what makes this certification respected across the industry.
Where DevSecOps fits in a broader security career
If you are pursuing a cybersecurity diploma, working toward CISSP, or already hold a Linux+ or AWS certification, DevSecOps sits at a powerful intersection of all that knowledge.
| Existing skill | How it applies in DevSecOps |
|---|---|
| Linux administration | Infrastructure hardening, Ansible automation, golden image builds |
| Networking & security fundamentals | Threat modeling, DAST configuration, SSL/TLS testing |
| Cloud (AWS/Azure) | DevSecOps pipelines in cloud-native environments |
| CISSP Secure SDLC knowledge | Directly maps to CDP curriculum chapters 3–9 |
DevSecOps is not a detour from a cybersecurity or DevOps career. It is where those two paths converge — and where some of the most in-demand, well-compensated roles currently exist.
Final thoughts
DevSecOps represents a maturation of how the industry thinks about building software. Security is no longer a gate at the end of the process — it is woven into every stage, automated where possible, and made a shared responsibility across development and operations teams.
If you are an IT professional looking to advance your career, learning DevSecOps gives you skills that are immediately applicable in almost any organization that ships software. And if you want to formalize those skills with a credential that proves you can do the work, the Certified DevSecOps Professional (CDP) from Practical DevSecOps is a certification worth serious consideration.
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