Senior Site Reliability Engineer

Mozilla

Senior Site Reliability Engineer for Thunderbird, establishing infrastructure and operational systems in a fully remote role. Responsible for CI/CD systems, production incidents, and continuous improvement.

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

Tech Stack

Tools & technologies

AWSKubernetesTerraform

About the role

Key responsibilities & impact

Operate and evolve our EKS-based Kubernetes platform
Design and develop CI/CD systems supporting websites, services, and Thunderbird desktop releases
Write and maintain infrastructure in Pulumi and/or Terraform/OpenTofu across multiple AWS accounts
Operate and evolve our observability stack and partner with engineering teams to incorporate instrumentation and monitoring into service design
Apply security-conscious infrastructure practices
Diagnose and debug production incidents and drive root-cause analysis
Participate in on-call rotation and collaborate with SDEs and fellow SREs
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
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
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

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) 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/CDPulumiTerraformOpenTofuAWSinfrastructure-as-codeobservabilitymonitoringroot-cause analysis

Soft Skills

ownership mindsetcommunicationcollaborationtroubleshootingproblem-solvingproactive identification of issuesasync written communicationability to learnevaluation of technologiesresponsible use of technologies