Our Custom Projects service offers bespoke cybersecurity solutions tailored to your unique challenges, from specialized research to developing unique security tools and programs.
ReactiveZero understands that some cybersecurity challenges require a unique approach. Our Custom Projects service allows us to collaborate closely with your organization to design and deliver bespoke solutions, whether it's specialized research, developing custom security tools, or creating tailored security awareness programs that go beyond standard offerings.
Bespoke work has no template, so we run it as an engineering project: framed with you, prototyped early, built in short visible sprints, and handed over with everything needed to run it without us.
Working sessions with your engineers turn the request into a written problem statement, hard constraints and a definition of done.
We prototype the riskiest assumption first: a throwaway spike against your real data or environment, before committing to an architecture.
Short sprints in a shared repository: reviewed commits, a living threat model, and running code demonstrated at every sprint end.
An engineer who did not write it attacks the build: fuzzed inputs, abused privileges, and a look at how it fails.
You receive the repository, build pipeline, runbooks and a recorded walkthrough, so your team can maintain and extend it without us.
When a system is too novel for an off-the-shelf checklist, we build a threat model around it. Working from your architecture and data flows, we identify the assets that matter, the realistic adversaries, and the attack paths between them, then rank the risks so engineering effort lands where it counts. This suits new products, emerging technologies, IoT and OT platforms and complex integrations. You receive a documented model — trust boundaries, abuse cases and prioritised mitigations — that guides both development and the penetration testing that follows.
Some engagements need tooling that does not exist yet. Our consultants build custom security tools — bespoke scanners, fuzzers, decoders, exploit proofs-of-concept and monitoring scripts — tailored to your technology and threat model. We have written tooling such as MendixScope for low-code platforms and utilities for niche protocols and air-gapped environments. Everything is delivered with source code and documentation so your team can run and extend it after the engagement, turning a one-off assessment into a repeatable capability you own.
We conduct focused security research into the threats, vulnerabilities and technologies that specifically affect your organisation. That can mean reverse-engineering a product you depend on, investigating a new attack technique against your stack, or validating a vendor's security claims before you buy. Our team has a track record of responsible disclosure, including published CVEs and public research on widely used systems. You receive a clear technical write-up with evidence, real-world impact and pragmatic recommendations you can act on immediately.
We design and deliver cybersecurity training built around your people and your technology rather than a generic slide deck. Formats range from secure-coding workshops for developers and cloud-hardening sessions for engineers to threat briefings for management and hands-on exercises for security teams. Content is drawn from real findings in your own environment and from our offensive engagements, so the lessons are concrete and immediately applicable. Sessions can be run on-site in Rotterdam and across the Netherlands or delivered remotely to distributed teams.
Ready to strengthen your security posture? Let's discuss how we can help protect your organization.