Build Securely · Application Security
Application Security
Applications are where most business logic, and most business risk, actually lives. AppSec is about catching flaws before release, and building the habits that mean fewer flaws ship in the first place.
Delivered from our base in Utrecht, available to organisations across the Netherlands.
The problem
Most application vulnerabilities aren't exotic zero-days. They're well-understood flaw categories (injection, broken authorization, insecure deserialisation) that keep recurring because the development process doesn't catch them before release. Automated scanners help, but they structurally can't find business-logic flaws specific to how your application actually works.
Business impact
Applications typically sit closest to the data and business logic an organisation actually depends on, which makes an application-layer compromise one of the more direct paths to serious impact: data exposure, fraud, or an attacker operating with the same permissions as a legitimate user.
Grounded in OWASP guidance, applied to how your engineering team actually ships software.
Secure SDLC
Security built into the development lifecycle from design through release, not bolted on at the end when changing course is expensive.
SAST, DAST & SCA
Static analysis, dynamic testing and software composition analysis, tuned to cut noise so findings actually get fixed instead of dismissed.
Threat modelling
Structured review of a design before it's built, so the expensive fixes happen on a whiteboard, not in production.
Source code review
Manual review for logic flaws that automated scanners consistently miss: business-logic bypasses, authorization gaps, and issues specific to how your application actually works.
Software supply chain security
Knowing what third-party libraries and dependencies your application includes, and whether any carry known vulnerabilities or came from a compromised source.
Mobile application security
iOS and Android application review covering platform-specific storage, transport and binary risks.
Secure coding practices
Practices embedded into how your engineers already work, not a training session nobody remembers six months later.
API security
APIs are frequently the least-tested part of an application. No UI to click through, so they get less manual scrutiny, while carrying the same authentication, authorization and data-handling risks as the application in front of them. We test APIs directly: broken object-level authorization (IDOR), broken authentication, excessive data exposure, and rate-limiting gaps, aligned to the OWASP API Security Top 10.
How this engagement runs
Assess
Understand the current state, real risk, and what's actually driving the need for this work.
Architect
Design the controls and approach that fit your environment, not a generic template.
Implement
Deploy and integrate the work: configuration, code, or process, whichever the engagement calls for.
Validate
Test that it actually holds up, rather than assuming it does because it's been deployed.
Improve
Feed findings back in as your environment and the threat landscape change.
Who this is for
- Engineering teams building customer-facing web or mobile applications
- SaaS companies whose customers are starting to ask security questions in procurement
- Organisations that have never had application code independently reviewed
- Teams preparing for a compliance requirement (SOC 2, ISO 27001) that expects demonstrable AppSec practices
What you get
- A secure SDLC process mapped to how your team actually develops
- Tuned SAST/DAST/SCA configuration with actionable, prioritised findings
- Manual source code review covering business-logic and authorization flaws
- A software bill of materials and dependency risk assessment
- Secure coding guidance specific to your stack and common findings
Frequently asked questions
We already run a SAST tool. Why would we need this?
A SAST tool run with default rules on an untuned codebase produces enormous volumes of low-value findings that engineers eventually stop reading. We tune tooling to your codebase and add the manual review that catches what automated scanning structurally can't: business logic flaws, authorization bypasses, and issues specific to how your application actually works.
Is this the same as a penetration test?
Related but different. Application security work happens throughout development: secure SDLC, code review, dependency management. A penetration test is a point-in-time assessment of a specific application, usually before a major release or on a recurring schedule. Most mature programmes do both.
Do you review mobile apps as well as web applications?
Yes. iOS and Android application security review covers platform-specific risks like insecure local storage, weak transport security, and binary-level issues that don't apply to web applications.