Senior Site Reliability Engineer

Mozilla

Senior Site Reliability Engineer establishing infrastructure and operational systems for Thunderbird's open-source email applications. Focusing on reliability improvements and collaboration with distributed teams.

Posted 6/8/2026full-timeRemote • California • 🇺🇸 United StatesSenior💰 $123,000 - $144,000 per yearWebsite

Tech Stack

Tools & technologies

AWSGrafanaKubernetesTerraform

About the role

Key responsibilities & impact

Operate and evolve our EKS-based Kubernetes platform, supporting service migrations, platform improvements, and reliability initiatives.
Design and develop CI/CD systems supporting websites, services, and Thunderbird desktop releases, contributing to pipeline reliability and OIDC-based authentication across GitHub Actions workflows.
Write and maintain infrastructure in Pulumi and/or Terraform/OpenTofu across multiple AWS accounts.
Operate and evolve our observability stack (VictoriaMetrics, VictoriaLogs, Grafana, Vector) and partner with engineering teams to incorporate instrumentation and monitoring into service design.
Apply security-conscious infrastructure practices, including least-privilege IAM, secrets management via AWS Secrets Manager and External Secrets Operator, and network segmentation.
Diagnose and debug production incidents; drive root-cause analysis and post-incident improvements to prevent recurring problems.
Participate in on-call rotation and collaborate with SDEs and fellow SREs to ship, maintain, and monitor new builds and support service onboarding.
Contribute to runbooks, architecture documentation, and team processes.

Requirements

What you’ll need

7+ years of experience in infrastructure, platform engineering, or site reliability roles, including hands-on production Kubernetes experience in workload operations, troubleshooting, and cluster management.
Hands-on experience with infrastructure-as-code on AWS using Terraform, OpenTofu, or Pulumi.
Security awareness in day-to-day infrastructure work: identity, least privilege, secrets hygiene, and network controls.
Demonstrated ownership mindset with the ability to proactively identify issues, drive work to completion, and communicate risks early.
Excellent async written communication skills; comfortable working with a geographically distributed team.
Ability to collaborate effectively with software engineers and non-engineering stakeholders to improve platform reliability and operational efficiency.
Ability to learn, evaluate, and responsibly use emerging technologies, including AI-enabled tools, to improve work processes.

Benefits

Comp & perks

Fully remote work & schedule flexibility
Company-provided laptop
Annual bonus program
Monthly remote work stipend
Annual professional development stipend
Industry conferences
Company all-hands and team gatherings
24 days PTO per year (prorated)
Your birthday
Year-end company shutdown
9 wellbeing days
Public holidays
Other paid leave
Quarterly wellbeing stipend for personal / family activities
401(k) / RRSP contributions
Health, dental, & vision insurance
Disability insurance
Life insurance
Employee assistance program
Paid parental leave
Paid sick days

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills & Tools

KubernetesCI/CDPulumiTerraformAWSOIDCVictoriaMetricsGrafanaVectorsecrets management

Soft Skills

ownership mindsetcommunicationcollaborationproblem-solvingproactive identification of issuesasync written communicationability to learnevaluation of technologies