It all started in 2008 with one person who needed help with a malware infection, and a community coming together to find solutions. Malwarebytes began after our founder, Marcin Kleczynski, accidentally infected his parents’ computer while downloading a video game as a teenager. 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. 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.
An experienced Principal Software Engineer to join our Browser Guard engineering team. This role will have the autonomy to drive technical decisions and work closely with Product, UX, QA, and Engineering teams to build high-impact features used by millions of customers.





Build and deliver next-generation security features for the Browser Guard engineering team.
Solve complex technical challenges by applying strong knowledge of system design, algorithms and data structures.
Write clean, scalable, and high-quality code using modern engineering practices.
Collaborate across Engineering, Product, UX, and QA to deliver roadmap initiatives.
Leverage AI-powered development tools and workflows to improve engineering productivity.
Proven experience building product-based scalable applications with React, TypeScript, and Go.
Strong understanding of data structures, algorithms, and software design patterns.
Hands‑on experience with AI-assisted development workflows while maintaining high code quality.
Strong focus on code quality, testing, debugging, and maintainability.
Experience with Git, code reviews, and modern software development practices.
Private Health Insurance – Comprehensive medical, dental, an

📌 Senior Principal Software Engineer (España)
🏢 Malwarebytes
📍 España