Software Developer jobs in Canada

• Backend & System Design
  • Build and scale APIs and backend services, with a focus on Ruby on Rails.
  • Implement real-time validation, monitoring, and security enforcement for AI-driven workflows.
  • Evaluate and integrate open source and custom software solutions.
  • Deploy and manage applications in cloud-native environments (Kubernetes, Terraform, multi-cloud).
• Application Development
  • Develop Rails-based features for enterprise integration, compliance reporting, and security workflows.
  • Build intuitive front-end components, including charting and visualization tools for monitoring and analytics.
  • Ensure reliability and scalability of services with performance targets (e.g., P95 <15ms latency, 99.99% availability).
• Collaboration & Leadership
  • Work with security researchers and product leaders to define the roadmap.
  • Mentor engineers and contribute to a high-performing technical team.

• 10+ years of proven experience in backend systems, distributed infrastructure, or security engineering.
• Strong modern Ruby on Rails expertise with solid backend architecture experience.
• Deployment experience across modern cloud-native stacks (Docker, Kubernetes, Helm, Terraform, multi-cloud).
• Front-end development skills, particularly with data visualization and charting frameworks (e.g., Chart.js, echarts, or similar).
• Strong programming skills in at least one additional language (Python, Go, Rust, or Java).
• Familiarity with AI/ML security challenges (adversarial ML, content filtering, prompt injection).

• Contributions to open-source security or AI projects.
• Experience with enterprise integrations (SIEM/SOAR, SOC tools, HIPAA, PCI-DSS, SOC2, ISO, GDPR).
• Background in adversarial ML research or compliance-focused security.

• 90 days: Build key product features for on prem and cloud native core products.
• 6 months: Build out policy creation, compliance reporting, and chart-driven analytics dashboards.
• 12 months: Achieve global adoption with a secure, scalable Rails platform powering predictive defenses.
• Commitment to our values:
• Welcoming differences
• Being relationship-minded
• Practicing responsible participation
• Having grit

• Generous performance-based bonus plans to all eligible employees - we share in our success as one team
• Rich medical, dental, and vision coverage
• Generous retirement contributions with 100% immediate vesting (regardless of whether you contribute)
• Quarterly all-company wellness days where everyone takes a pause together
• Country specific holidays plus a day off for your birthday
• One-time home office stipend
• Annual professional development budget
• Quarterly well-being stipend
• Considerable paid parental leave
• Employee referral bonus program
• Other benefits (life/AD&D, disability, EAP, etc. - varies by country)

Mozilla exists to build the Internet as a public resource accessible to all because we believe that open and free is better than closed and controlled. When you work at Mozilla, you give yourself a chance to make a difference in the lives of Web users everywhere. And you give us a chance to make a difference in your life every single day. Join us to work on the Web as the platform and help create more opportunity and innovation for everyone online.

Mozilla understands that valuing diverse creative practices and forms of knowledge are crucial to and enrich the company’s core mission. We encourage applications from everyone, including members of all equity-seeking communities, such as (but certainly not limited to) women, racialized and Indigenous persons, persons with disabilities, persons of all sexual orientations, gender identities, and expressions.

We will ensure that qualified individuals with disabilities are provided reasonable accommodations to participate in the job application or interview process, to perform essential job functions, and to receive other benefits and privileges of employment, as appropriate. Please contact us at hiringaccommodation@mozilla.com to request accommodation.

We are an equal opportunity employer. We do not discriminate on the basis of race (including hairstyle and texture), religion (including religious grooming and dress practices), gender, gender identity, gender expression, color, national origin, pregnancy, ancestry, domestic partner status, disability, sexual orientation, age, genetic predisposition, medical condition, marital status, citizenship status, military or veteran status, or any other basis covered by applicable laws. Mozilla will not tolerate discrimination or harassment based on any of these characteristics or any other unlawful behavior, conduct, or purpose.

Group: C

#LI-REMOTE

Req ID: R2943