Senior Security Engineer, Add-ons Operations

This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Senior Security Engineer, Add-ons Operations based in Canada.

This role sits at the intersection of security engineering, platform reliability, and ecosystem trust for a large-scale add-ons marketplace used by millions of users worldwide. You will help safeguard the integrity of extension submission, review, and moderation systems while improving the infrastructure that powers developer and reviewer workflows. The environment is highly collaborative and mission-driven, with a strong emphasis on open collaboration, transparency, and user trust. You will work across engineering, product, and operations teams to design resilient systems that detect abuse, prevent malicious behavior, and ensure policy compliance. The role also involves modernizing tools and services that support developers and reviewers. You will contribute directly to both backend and full-stack systems in a fast-moving, globally distributed team. Your work will have direct impact on platform safety, reliability, and user experience at global scale.

• Lead the design and delivery of security-focused and reliability improvements across add-ons submission, review, and moderation systems, ensuring safe and trustworthy ecosystem operations.
• Build and maintain automated security and abuse detection systems, including workflows for policy enforcement, content moderation, and risk mitigation.
• Improve platform observability through monitoring, logging, alerting, and data-driven insights to detect incidents and prevent recurring issues.
• Participate in incident response and operational support, resolving critical issues affecting developers, reviewers, or end users.
• Contribute to full-stack development efforts across backend services (Python/Django), frontend tools (React/TypeScript), and cloud infrastructure (Google Cloud).
• Collaborate with cross-functional teams including engineering, product, QA, and developer relations to deliver end-to-end improvements to ecosystem tools and processes.
• Support modernization of reviewer tools, DevHub systems, and moderation pipelines to improve efficiency, scalability, and security posture.

Requirements:

This role requires strong experience in building secure, scalable web platforms and operating production systems at scale. Candidates should have a solid foundation in backend development (preferably Python/Django or similar frameworks) and familiarity with modern frontend and distributed system architectures. Experience working in cloud environments (such as Google Cloud or equivalent) and deploying production services with strong reliability practices is essential. You should bring deep understanding of web security principles, secure coding practices, and abuse prevention strategies. Strong communication and collaboration skills are critical for working effectively in distributed, cross-functional teams. Experience navigating ambiguous technical spaces, improving system reliability, and contributing to operational excellence will be key to success. Bonus experience in open-source environments, automated security systems, or ecosystem moderation tools is highly valued.

• 5+ years of experience in software engineering, with a focus on backend or full-stack development in production environments
• Strong experience with Python/Django or similar backend frameworks
• Experience with cloud platforms (Google Cloud, AWS, or Azure) and production system operations
• Strong knowledge of web security principles, threat modeling, and abuse prevention techniques
• Experience building or maintaining distributed systems with high reliability and observability requirements
• Familiarity with React/TypeScript or similar frontend technologies is a plus
• Experience with incident response, on-call operations, and production debugging
• Strong collaboration skills in distributed engineering teams and open communication practices
• Bonus: experience with open-source contributions, moderation systems, or automated security tooling

Benefits:

• Competitive salary aligned with Canadian market ranges ($94,000 – $139,000 CAD depending on location tier)
• Performance-based bonus program
• Comprehensive health, dental, and vision coverage
• Retirement contributions with immediate vesting
• Flexible remote work environment
• Home office stipend and annual professional development budget
• Paid parental leave and generous time off policies, including wellness days and birthday leave
• Quarterly well-being stipend and employee assistance programs
• Life, disability, and additional insurance coverage (varies by region)
• Opportunities to contribute to open-source projects and global-scale products