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We’re hiring a Senior System Software Engineer
At CounterCraft, we don’t just detect threats — we engage adversaries directly. Our deception-powered platform is trusted by governments and Fortune 500s to uncover, observe, and outmaneuver some of the most advanced cyber attackers on the planet.
We're looking for a Senior System Software Engineer who knows how systems work from the inside out — someone who lives at the intersection of OS internals, secure coding, and real-world performance at scale.
About the Role
You’ll be part of the Security Engineering team, building the cross-platform monitoring agent that powers our adversary-facing tech. It’s the kind of code that runs deep in the system — and makes a real difference in the fight against sophisticated cyber threats.
Work remotely from anywhere in Spain, or from our San Sebastián HQ in the Miramon tech hub.
What You’ll Do
* Build and maintain low-level system software on Linux and Windows.
* Drive architecture and design decisions across both platforms.
* Provide technical leadership for new features and long-term roadmap planning.
* Maintain and improve our CI pipeline and test suites.
* Support the Ops team in understanding and resolving issues in live environments.
* Help shape a team culture grounded in technical excellence and software resilience.
What We’re Looking For
* 5+ years of experience in system-level software engineering.
* Deep expertise in C/C++.
* Strong understanding of Windows & Linux internals.
* Solid grasp of multi-threading, performance tuning, and concurrency.
* Proven track record designing and shipping multi-platform solutions.
* Experience in the security or threat intelligence space.
* Familiar with Python and scripting for system tasks.
* Strong understanding of secure coding practices and software lifecycle.
* Hands-on with eBPF (or curious to go deep there).
* Experience contributing to open source, especially kernel-related projects.
* Familiarity with stealth, monitoring, or anti-forensic techniques.
* Technically driven, with an eye for elegant and practical solutions.
* Comfortable owning complex components end-to-end.
* Clear communicator who can collaborate with cross-functional teams.
* Always learning. Always improving.
What We Offer
* A deep tech product you’ll be proud to contribute to.
* Flexible, remote-first culture (within Spain).
* Competitive salary + annual bonus.
* International clients, real-world impact.
* No fluff. No BS. Just meaningful work with brilliant people.
* Growth opportunities regardless of seniority or title.
CounterCraft is a global cybersecurity company that specializes in adversary-generated threat intelligence powered by deception. Our technology helps organizations detect, investigate and respond to advanced threats — faster and
We work with law enforcement, defense agencies and Fortune 500 companies, protecting them against cyber adversaries using proactive and intelligent techniques.
Ready to make an impact?
If you’re passionate about systems programming and want to help shape the future of cyber defense, we’d love to hear from you. Apply now or share this with someone who fits the role.
Seniority level
* Seniority level
Mid-Senior level
Employment type
* Employment type
Full-time
Job function
* Job function
Engineering and Information Technology
* Industries
Computer and Network Security
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