About the role

Role Overview

Join Thunderbird (Mozilla), an open-source project focused on privacy and ownership. As a Senior Site Reliability Engineer, you will design CI/CD systems, respond to and debug production incidents, and drive reliability improvements across the platform.

This is a full-remote role with a requirement for consistent overlap with Pacific Time (PT) working hours.

Key Missions

Operate and improve core infrastructure that Thunderbird users and internal teams depend on daily.
Design and develop CI/CD systems for MZLA websites, services, and release workflows.
Diagnose and resolve production incidents, including troubleshooting and debugging.
Operate and evolve an EKS-based Kubernetes platform, supporting service migrations, platform improvements, and reliability initiatives.

Responsibilities

Work closely with software engineers and platform stakeholders to improve reliability and operational efficiency.
Maintain and enhance CI/CD workflows and production operations.
Collaborate effectively in a distributed environment using strong async written communication.
Apply strong security practices in day-to-day infrastructure work (identity, least privilege, secrets hygiene, network controls).

Requirements

7+ years in infrastructure, platform engineering, or SRE roles, including hands-on production Kubernetes experience.
GitOps experience using ArgoCD or Flux.
Infrastructure-as-Code on AWS using Terraform, OpenTofu, or Pulumi.
Ability to operate, troubleshoot, and manage Kubernetes workloads and clusters.
Familiarity with identity platforms such as Keycloak and standards like OIDC, SAML, and federation.
Experience/knowledge related to email protocols and/or email infrastructure (e.g., SMTP, IMAP).
Demonstrated ownership mindset, proactive issue identification, and early risk communication.
Strong async written communication skills for a geographically distributed team.
Security awareness (identity, least privilege, secrets hygiene, network controls).
Prior work in or alongside an open-source community.
Language proficiency: French, German, Japanese, or other in addition to English.

Nice-to-Have / Additional Focus

Ability to learn and responsibly adopt emerging technologies (including AI-enabled tools) to improve processes.
Strong collaboration across both engineering and non-engineering stakeholders.

About Mozilla

Mozilla is a technology company best known for building and supporting open-source software and web technologies with a focus on privacy and user empowerment. In this role, you would join Thunderbird, Mozilla’s open-source email project centered on privacy and user ownership.

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