Senior Product Security Engineer - Remote & Impactful

Software Careers; España; On-site; EUR 58,000 - 77,000; Full time

Benefits offered by this job

Bonus plan

Medical, dental, and vision coverage

Retirement contributions

Quarterly wellness days

Home office stipend

Professional development budget

Parental leave

Employee referral program

Job summary

Mozilla Corporation is the non-profit-backed technology company behind Firefox, Add-ons, and more. We seek a Senior Software Engineer - Operations to advance the Add-ons platform with secure, reliable systems and cross-functional collaboration. You will help design features, improve architecture, and ensure safety for millions of users globally.

The role emphasizes security awareness, scalable backend work, and contributions to open collaboration while working remotely from Spain.

Qualifications

• Experience building modern web applications.
• Strong experience with Python/Django or similar backend frameworks.
• Understanding of web security principles and practices.
• Strong collaboration and communication skills in a distributed team environment.
• Adept at navigating ambiguity, exploring solutions, and shaping direction in new problem spaces.

Responsibilities

• Deliver major features and architectural improvements across the Add-ons stack, including automated moderation pipelines and DevHub.
• Create robust observability systems and data-backed insights.
• Provide peer feedback, share knowledge and help others grow.
• Improve platform reliability through deployments, monitoring, and incident response.

Skills

Web applications

Python/Django

Web security

Collaboration

Ambiguity navigation

Job description

Mozilla Corporation is the non-profit-backed technology company behind Firefox, Add-ons, and more. We seek a Senior Software Engineer - Operations to advance the Add-ons platform with secure, reliable systems and cross-functional collaboration. You will help design features, improve architecture, and ensure safety for millions of users globally.

The role emphasizes security awareness, scalable backend work, and contributions to open collaboration while working remotely from Spain.