Senior Infrastructure & Reliability Engineer (Hybrid Cloud)

Mozilla; United States; Hybrid; USD 163,000 - 218,000; Full time

Benefits offered by this job

Generous bonus plans

Rich medical/dental/vision coverage

Retirement contributions

Home office stipend

Professional development budget

Job summary

Mozilla seeks a Staff Operations Engineer to lead the design, reliability, and evolution of hybrid-cloud and workplace infrastructure. This senior role spans teams, drives complex initiatives, sets technical direction, and ensures systems are scalable, secure, and efficient.

This role combines technical execution with leadership, shaping architecture both directly and collaboratively. You’ll own domain architecture, tackle complex projects, and collaborate across IT, SRE, Security, and service

Qualifications

• 6+ years of experience in systems engineering or infrastructure roles.
• Strong experience designing and operating production infrastructure.
• Demonstrated ability to lead complex technical work across teams.

Responsibilities

• Own and evolve architecture within a defined infrastructure domain.
• Design and implement scalable, reliable systems spanning multiple teams or environments.
• Establish and promote best practices, patterns, and standards within the domain.
• Contribute to medium- and long-term technical strategy (typically 6-18 months).
• Lead delivery of ambiguous, high-impact infrastructure projects.
• Break down elaborate system problems into implementable solutions.
• Drive migrations, re-architectures, and performance/reliability improvements.
• Remain hands-on with critical systems and implementations.
• Work across teams (IT, SRE, Security, Service Owners) to unify solutions.
• Influence technical decisions through design reviews and collaboration.
• Ensure systems integrate cleanly across infrastructures (office, DC, cloud).
• Improve system reliability through monitoring, alerting, and operational design.
• Contribute to defined SLIs/SLOs and capacity planning.
• Participate in and lead root cause analysis for complex incidents.
• Decrease operational toil through automation and system improvements.
• Design and support core infrastructure components (compute, DNS, networking, identity).
• Drive improvements in performance, scalability, and dependability.
• Contribute deep expertise in at least one area (e.g., DNS, network architecture, cloud infra).
• Build and improve automation using scripting and Infrastructure as Code.
• Contribute to internal tooling and platform improvements.
• Promote repeatable, standardized approaches to system management.
• Mentor engineers and guide system design and troubleshooting.
• Raise the technical quality of the team through reviews and shared practices.

Skills

Systems engineering

Infrastructure design

Leadership

SRE / Reliability practices

Scripting / IaC

Security best practices

Networking fundamentals

Linux/Unix

Data center environments

Tools

VMware

Cisco UCS

Application/Network Loadbalancers

Linux/Unix

DNS

TCP/IP

Firewalls

Data center environments

Job description

Mozilla seeks a Staff Operations Engineer to lead the design, reliability, and evolution of hybrid-cloud and workplace infrastructure. This senior role spans teams, drives complex initiatives, sets technical direction, and ensures systems are scalable, secure, and efficient.

This role combines technical execution with leadership, shaping architecture both directly and collaboratively. You’ll own domain architecture, tackle complex projects, and collaborate across IT, SRE, Security, and service