About ThreatDown

ThreatDown, the corporate business unit of Malwarebytes, is redefining cybersecurity for growing businesses with solutions that stop ransomware, malware, phishing, and AI-powered attacks. Our platform is trusted, intuitive, and built for lean IT teams that need speed without complexity. At ThreatDown, you’ll join a team driven by innovation, resilience, and a passion for empowering businesses to thrive securely. If you're ready to make a real impact in cybersecurity, we’d love to meet you.

ThreatDown is looking for...

ThreatDown is looking for a Windows EDR Development Engineer to help build the next generation of endpoint detection and response capabilities for enterprise environments.

This role may be a great fit if you enjoy working close to the operating system, solving complex systems-level problems, and building security products that operate reliably at scale. You will contribute to user-mode and kernel-mode components that support endpoint telemetry, threat detection, prevention, self-protection, and remediation.

You will collaborate with detection engineers, security researchers, and platform teams to deliver high-performance, resilient, and secure endpoint technologies that help protect customers from modern threats.

What You Will Do

- Design, develop, and maintain Windows endpoint sensor components in C++ and C#.
- Build and enhance telemetry collection, detection, prevention, and response capabilities for EDR products.
- Develop software that operates across both user-mode and kernel-mode environments.
- Design and maintain Windows drivers, system services, and other low-level platform components.
- Implement new endpoint protection capabilities and continuously improve existing detection technologies.
- Debug and resolve complex issues involving Windows internals, kernel interactions, memory management, and system performance.




- Partner with detection engineers and security researchers to translate threat intelligence into product capabilities.
- Optimize endpoint performance, stability, and resource utilization across large-scale deployments.
- Participate in architecture reviews, code reviews, and engineering design discussions.
- Contribute to engineering best practices, quality initiatives, and continuous improvement across the team.

Skills You'll Need To Have

- Bachelor’s or Master’s degree in Computer Science, Computer Engineering, Cybersecurity, a related field, or equivalent practical experience.
- Professional software development experience on Microsoft Windows; experience with systems-level or endpoint software is especially helpful.
- Proficiency in C++ and familiarity with C#, or the ability to ramp up quickly in C#.
- Solid understanding of Windows internals, operating system architecture, or system-level programming concepts.
- Experience developing software with Windows APIs and native operating system services.
- Experience with Windows driver development, kernel-mode programming, or closely related low-level Windows technologies.
- Debugging and troubleshooting experience using WinDbg or comparable diagnostic tools.
- Experience contributing to production-grade software or services used by customers or internal teams.
- Understanding of secure software development practices and an interest in building reliable, trustworthy systems.
- Strong analytical and problem-solving skills, with the ability to communicate technical ideas clearly with teammates and partners.
- Ability to communicate effectively in written and spoken English in a collaborative engineering environment.

Perks & Benefits

- Comprehensive medical, dental, and vision insurance coverage
- Employee Referral Bonus Program
- Wellness programs
- Comprehensive Time Off policy
- An opportunity to do something great for yourself and the world!

(Benefits and Perks subject to change by country/region)

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📌 Principal Software Engineer - Windows EDR (España)
🏢 Malwarebytes
📍 España