Defense & Security

The world is changing fast. Threats are more complex, more connected, and harder to anticipate than ever before. Protecting people, infrastructure, and sovereignty demands systems that don't fail — and partners who understand what's truly at stake.

Defense

Protected, secure, safe

The nature of defense has shifted. Today's challenges aren't only fought on traditional battlefields — they play out across digital networks, maritime borders, critical infrastructure, and command centres under pressure. Being ready means having the right technology, built to the highest standards, before you need it.

For over two decades, Critical Software has worked alongside defense forces, coast guards, navies, and government agencies to build the systems they depend on. Not off-the-shelf tools, but mission-critical software engineered to perform in environments where failure is not an option.

Our work is guided by deep technical expertise, rigorous safety and security standards, and a genuine understanding of the operational realities our partners face. From anticipating threats to coordinating responses, we help defense and homeland security organizations stay ahead — protecting what matters most.

Some of the brands that trust us

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Our solutions

How we support you

No two defense organizations face identical challenges. We bring a broad set of capabilities so we can meet you where you are — and build what you actually need.

Software & Product Development

From embedded systems to advanced user interfaces, we design and develop software built to operate reliably in the most demanding defence environments — meeting the highest safety and quality standards throughout.

Safety Assessments & Cyber Security

As threats evolve, so must defenses. We provide comprehensive gap analysis, security assessments, and penetration testing to identify vulnerabilities before they can be exploited — keeping critical systems and sensitive data secure.

Verification & Validation

When lives depend on your systems working correctly, there's no room for assumptions. Our independent V&V services and test automation give you the confidence that every component performs exactly as required.

Systems Migration

Modernizing legacy infrastructure without disrupting active operations is one of defence's hardest challenges. We plan and execute migrations carefully, ensuring continuity, security, and full compliance at every step.

Reverse Engineering & Integration

Complex defense environments often mean integrating decades of legacy systems with modern platforms. We bridge that gap — reverse engineering existing architectures and delivering seamless, robust system integration.

Oversee

Maritime Security Operations

An award-winning maritime security platform built to give operators a complete, real-time picture — and the tools to act on it.
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Resources

Our defence knowledge hub

Browse our white papers and case studies to find out more about the clients we work with and the defence projects we’ve enhanced over the years.

White Papers

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Systems Engineering and Complex Systems Integration

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Using Agile to Develop High-Integrity Systems

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Automated Verification & Validation

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Case Studies

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Safety Assessments for Avionics Modification Programmes

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Automating Closed-Loop Testing

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Get in touch

Can we help secure what matters most?

Whether you need to modernize legacy systems, secure critical infrastructure, or build something entirely new — we're the right team to have in your corner.

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João Pedro Mortágua

Business Development Manager

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Vitor Monteiro Correia

Business Development Manager

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Gonçalo Valadas

Principal Engineer

News

Latest from defense and security

Insights, news, and perspectives from our defense and security team.

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When the Digital Euro Account Number Isn't an IBAN

The Digital Euro Account Number looks like an IBAN, but it doesn't tell you who holds the account. Rui Duarte Silva unpacks what that breaks in core banking integration.

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NewsMedical devices

Critical Software at Sword AI Summit 2026: Intelligence for a Deterministic World

Sérgio Pereira, Cluster Technology Director at Critical Software, takes the stage at Sword AI Summit 2026 in Porto to explain what it takes for AI agents to earn trust in safety-critical engineering.

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BlogEnergy

What CIGRE Paris 2026 Revealed About the Future of Energy

Pedro Cordeiro spent three days at CIGRE Paris 2026. Here's what he learned about grid digitalization, cybersecurity, and where the energy industry is heading.

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News

Critical Software Joins the AI Deployment Gap Initiative as a Founding Signatory

Critical Software has joined the AI Deployment Gap Initiative as a founding signatory — a coalition defining the engineering principles needed to deploy AI that is deterministic, governable, secure, and certifiable in the systems where failure isn't an option.

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BlogEnergy

Security's Real Breaking Point Isn't the Firewall

Ask where security breaks down and most organizations point to a missing patch. Pedro Cordeiro, Principal Engineer for Energy at Critical Software, points to the seams: integration boundaries nobody owns, inherited components nobody reviews, and configuration drift nobody notices. A look at resilience as architecture rather than a feature.

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Blog

Why L4, and Why Now?

AI is reshaping how software gets built — and how fast. Technology Director Patrick Machado reflects on why Critical Software is targeting L4 AI automation by end of 2026, what that means in practice, and why the companies that thrive won't be the smartest ones, but the fastest to adapt.

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BlogEnergy

Industry Voices: Why the UK's Energy Transition Will Live or Die on Data Standardization

The UK's path to a low-carbon grid depends on more than new wind turbines and battery storage — it depends on trusting the data those assets produce. LCCC's Chris Jones explains why standardization, not more bespoke integration, will determine whether the energy transition scales.

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BlogRailway

Industry Voices: Railway Certified Doesn't Mean Safe

Passing certification and being genuinely safe are not the same thing. CERTIFER Branch Director Lucas Sanchez explains the systemic blind spots that even well-intentioned railway suppliers miss — and why the arrival of AI is about to make those gaps much harder to hide.<br>

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BlogFinancial services

The Digital Euro and Merchants Minimal Effort: New Rules of the Game

For most merchants, the digital euro means activating one more payment method — nothing more. But beneath that operational simplicity lies something far more significant: a mandatory acceptance obligation, a cheaper payment rail, and a structural shift in negotiating power that no retailer can afford to ignore.<br>

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BlogMedical devices

QMSR's Wake-Up Call

When FDA's Quality Management System Regulation came into effect in February 2026, many saw it as a routine update. QMS consultant John Wolf sees something bigger — a reckoning for medical device companies that have been coasting on outdated compliance practices for decades.