Mozilla seeks a Senior Security Engineer (Incident Responder) to monitor and mitigate attacks across products and services. Responsibilities include incident command, designing alerts/playbooks/automation, threat hunting, and managing SIEM/EDR/SOAR tooling. Requires 5+ years of incident response or SOC/PSIRT/CSIRT experience and hands-on experience with SIEM (Splunk/ELK/BigQuery), EDR, SOAR (Tines/Splunk SOAR), and cloud platforms. Hiring range for Remote Spain: €58,000–€77,000 per year.

Join Mozilla's Ecosystem Services Team to build, operate, and maintain back-end platforms used by Firefox and other Mozilla products. Responsibilities include backend development, cloud deployments and operations (GCP/Docker), observability and monitoring (OpenTelemetry, Sentry, Prometheus, Grafana), participating in on-call rotations, API design, and collaborating with frontend, CloudEng, product, and UX teams. Requires 4+ years of software development experience with strong backend focus and professional experience in Python, TypeScript/Node.js, or Rust, plus PostgreSQL and hands-on GCP/DevOps experience.

Work with the WebCompat team to develop and enhance internal tooling: triage/reporting dashboards, metrics, and the broken-site-report screenshot capture and pipeline. Requires web development (JavaScript, HTML, CSS, Python & Django), familiarity with automation and web services, and collaboration with QA for reliable reporting and triage workflows.

Work on the addons.mozilla.org stack to deliver features and architectural improvements across DevHub, Reviewer tools and automated moderation pipelines. The role centers on Python/Django backend work, React/TypeScript front-end, CI/CD and platform reliability (observability, deployments, incident response), and contributing to internal developer platforms and engineering standards.

Work on AMO systems including DevHub, Reviewer tools, automated moderation pipelines, and internal developer platforms. The role emphasizes Python/Django backend work, React/TypeScript frontend, CI/CD and infrastructure-as-code, observability and SRE practices, technical documentation, and contributing in the open.

Mozilla is hiring a Staff Operations Engineer to lead architecture, reliability, and evolution of hybrid-cloud and workplace infrastructure. The role requires 6+ years in systems/infrastructure engineering and experience with VMware, Cisco UCS, Linux/Unix, networking (DNS, TCP/IP), data center environments, automation/IaC (Puppet/Ansible), Python, observability, and containerization. US-based remote; listed salary ranges span approximately $139,000–$218,000 USD annually across tiers.

Staff Operations Engineer responsible for designing and operating scalable, secure hybrid-cloud and on-prem infrastructure (compute, DNS, networking, identity, load balancers, data centers). Leads cross-team initiatives, drives migrations and reliability improvements, builds automation and IaC, mentors engineers, and maintains runbooks. Preferred experience with Puppet/Ansible, Python, observability, and containerization. Remote (Canada).

The Staff Operations Engineer will lead architecture, reliability, and evolution of hybrid-cloud and workplace infrastructure, drive complex cross-team initiatives (migrations, re-architectures, performance/reliability work), and remain hands-on with critical systems. Required: 6+ years in systems/infrastructure engineering and strong experience with VMware, Cisco UCS, load balancers, Linux/Unix, DNS/TCP-IP/routing/firewalls and data center environments. Preferred skills include IaC (Puppet/Ansible), Python, observability, containerization, and security best practices. Posting lists a salary range of €81,000–€108,000 (year) and is for Remote Germany.

Join the Add-ons team to deliver features and architectural improvements across AMO (DevHub, Reviewer tools, automated moderation). Work primarily with Python/Django, MySQL, React/TypeScript and asynchronous systems, improve CI/CD and infrastructure-as-code, and build observability and reliability practices for production services. Remote role based in Canada with stated annual hiring ranges.