The DevSecOps Maturity Model

Before examining specific models, it is worth understanding what problem they solve and why unstructured improvement so often disappoints.

The problem with ad-hoc improvement

Without a framework, security improvement tends to be reactive and uneven. Teams fix whatever caused the last incident, chase whatever a vendor is selling, or copy whatever a conference talk praised. The result is lopsided: sophisticated tooling in one area, glaring gaps in another, and no way to know whether the organization is actually getting more secure.

What a maturity model provides

A maturity model brings structure and objectivity:

• A common language so teams and leadership discuss security consistently.
• An honest baseline of current practice across multiple dimensions.
• A defined target appropriate to the organization's risk.
• A sequenced roadmap from current to target state.
• A way to measure progress over time and justify investment.

Without a model, you cannot answer the two questions leadership always asks: how mature are we, and what should we do next?

Assessment as a starting point

A maturity assessment is where a serious DevSecOps engagement begins. It replaces opinion with evidence and gives everyone a shared, defensible view of reality. GuardsArm uses structured maturity assessments to ground improvement roadmaps in fact rather than assumption.

Maturity is not a single score. Credible models assess several dimensions independently, because an organization can be strong in one and weak in another.

Common dimensions

• Build and deployment — how security is integrated into pipelines and release processes.
• Culture and organization — training, security champions, and shared ownership.
• Static and dynamic testing — the depth and coverage of automated security analysis.
• Infrastructure and hardening — secure configuration and patch discipline.
• Application and configuration management — dependency, secrets, and change management.
• Logging, monitoring, and response — visibility into security-relevant events and the ability to act on them.

Why independent dimensions matter

Measuring dimensions separately prevents a strength in one from masking a weakness in another. An organization might have excellent automated testing but weak monitoring — a gap that a single blended score would hide. Independent assessment surfaces exactly these imbalances.

A single overall maturity number is comforting and misleading. The value is in the profile — the shape of your strengths and gaps.

Mapping to OWASP models

OWASP DSOMM organizes practices into dimensions and sub-dimensions with concrete, testable activities at each level. OWASP SAMM structures maturity around business functions like governance, design, implementation, verification, and operations. Both give you a ready-made structure rather than a blank page.

Maturity models define progressive levels that describe how systematically a practice is performed. The exact names vary, but the progression is consistent.

A typical progression

• Level 1 — Initial/Basic. Security activities are ad-hoc, manual, and inconsistent. Some good practices exist but depend on individuals rather than process.
• Level 2 — Managed. Key practices are defined and applied consistently. Basic automation exists, and security is a recognized part of the workflow.
• Level 3 — Defined/Advanced. Practices are well-integrated, largely automated, and consistently applied across teams. Security is embedded in the culture.
• Level 4 — Optimized. Practices are continuously measured and improved, with sophisticated automation and proactive risk management.

Progression is not automatic

Each level builds on the one below. Skipping levels rarely works — advanced automation on top of an immature, chaotic process just automates the chaos. Solid foundations must come first.

Levels describe practices, not tools

Crucially, maturity describes how systematically something is done, not how much was spent. An organization can own expensive tools and still sit at Level 1 if those tools are used inconsistently.

Buying a Level 4 tool does not make you Level 4. Maturity is about consistency and integration, not license count.

The assessment itself must be done well; a superficial or dishonest one produces a roadmap built on sand.

Gather evidence, not opinions

Base the assessment on concrete evidence — actual pipeline configurations, real testing coverage, genuine incident response records — not on how mature people wish they were. Optimistic self-assessment is a common and costly failure.

Involve the right people

Accurate assessment requires input across development, security, and operations. Different groups see different parts of reality, and only together do they form an accurate picture. A view from any single silo will be distorted.

Score honestly against defined criteria

Use the model's specific, testable criteria for each level rather than subjective impressions. "We do some testing" is not a level; "automated SAST runs on every pull request with tracked remediation" is.

Produce a maturity profile

The output is a profile showing the current level of each dimension — the shape of strengths and gaps that drives everything downstream.

An honest assessment can be uncomfortable. It is also the only kind worth having — a flattering one plans the wrong work.

GuardsArm conducts independent maturity assessments precisely because an outside, evidence-based perspective produces a more honest baseline than internal self-scoring.

A maturity profile is diagnosis. The roadmap is treatment — and this is where the model delivers real value.

Define target maturity by risk

Not every dimension needs to reach the highest level. Appropriate targets depend on the organization's risk profile, regulatory obligations, and the criticality of its software. A regulated financial application warrants higher targets than an internal tool. Maximum maturity everywhere is a waste of scarce resources.

Prioritize the gaps

With current and target states defined, the gaps become the roadmap. Prioritize by:

• Risk reduction — which gaps expose the organization most?
• Foundational dependency — which improvements enable others?
• Effort and feasibility — which deliver meaningful gains for reasonable cost?

Sequence deliberately

Address foundational gaps before advanced ones. Strengthening basic dependency and secrets management usually matters more than adding a sophisticated capability on top of a weak base.

The roadmap's job is to answer "what next?" with evidence — closing the gap that reduces the most risk for the least wasted effort.

Make it concrete

Translate each roadmap item into specific initiatives with owners, timelines, and success criteria. A roadmap of vague aspirations changes nothing. GuardsArm turns maturity assessments into prioritized, actionable roadmaps mapped to each client's risk and compliance context.

Maturity is not a destination reached once. It must be sustained and periodically re-measured as the organization, its software, and the threat landscape evolve.

Maturity can regress

Hard-won maturity erodes. Staff turnover, delivery pressure, and neglected tools all cause practices to slip. A capability that was consistent last year can quietly decay. Maturity requires active maintenance, not just achievement.

Re-assess periodically

Re-run the assessment on a regular cadence — at least annually, and after major changes such as reorganizations, new platforms, or significant incidents. Re-assessment shows whether improvements stuck and reveals new gaps as the environment shifts.

Track progress over time

Comparing assessments across periods demonstrates progress, justifies continued investment, and keeps DevSecOps visible to leadership. A rising maturity profile is compelling evidence that security investment is working.

Balance measurement with action

A caution: the model is a means, not an end. The goal is better security outcomes, not a perfect score. Do not let assessment become bureaucratic overhead that crowds out the improvement it is meant to drive.

Re-assess to prove progress and catch regression — but never let scoring the model substitute for the security work the score is meant to advance.

GuardsArm supports organizations with periodic re-assessments and roadmap updates, keeping DevSecOps maturity a living, improving capability rather than a one-time report.