Senior Windows Platform Engineer

Malwarebytes began after our founder, Marcin Kleczynski, accidentally infected his parents’ computer while downloading a video game as a teenager. At the time, there was no product that could fully solve the problem, so he set out to build one. That early experience shaped our mission: to create protection that works when people need it most.
Since then, the digital threat landscape has only grown more complex. Attackers are faster, stealthier, and more sophisticated, while traditional solutions often overwhelm people with complicated tools and settings. At Malwarebytes, we believe protection should be both powerful and refreshingly simple because if security feels too hard to use, people will not use it. That is why our aspiration is always to stay one step ahead: cutting through the noise, stopping threats others miss, and delivering peace of mind in an unpredictable digital world. 

• →Work on the antivirus engine: implement new detection and protection features

• →Build and maintain user and kernel-level components

• →Write safe, efficient C++ code that runs with high privileges on production systems

• →Debug hard system issues using crash dumps, kernel debuggers, and trace tools

• →Work with Research to bring new threat detection ideas into the engine

• →Review code and share knowledge with teammates

• →Use AI tools to speed up development and testing

• Implement several new features in the antivirus engine, end to end

• Contribute to both user mode and kernel mode components

• Become a reliable owner of your area of the codebase

• 8+ years of professional C++ development

• Solid understanding of Windows internals at both user and kernel level

• Strong debugging skills: WinDbg, crash dumps

• High standards for code quality: solid grasp of SOLID principles and design patterns, applied consistently in a large codebase

• Experience shipping software that runs with high privileges on production systems

• Experience with antivirus, EDR, or endpoint security products

• Knowledge of Windows security features: ELAM, PPL, or kernel isolation

• Experience with driver signing or HLK/WHQL certification

• Familiarity with threat detection techniques or malware analysis

• Knowledge of C# and .NET, including common patterns and best practices