Senior Site Reliability Engineer

The Senior Site Reliability Engineer establishes and maintains the infrastructure and operational systems that Thunderbird users and teams depend on every day. You'll design and develop CI/CD systems for MZLA websites, services, and release workflows, diagnose and debug production incidents, and implement improvements to enhance system reliability. We believe that good infrastructure work is invisible when it's going well and invaluable when it isn't. This role is for someone who treats production as something to be understood, not just kept running. You write things down, flag problems before they become fires, and leave documentation better than you found it. You bring production instincts, infrastructure-as-code fluency, and security awareness that's baked in, not bolted on. You'll work closely with Software Development Engineers, team members, and community contributors, reporting to the Sr Manager, Platform Infrastructure. This is a great opportunity for someone who thrives with ambiguity, makes good decisions without a complete picture, and cares about Thunderbird's mission: open-source software used by millions who choose privacy and ownership over convenience. This role requires consistent overlap with Pacific Time zone working hours to enable effective collaboration. You should have availability for regular overlap hours for context sharing with Pacific Time colleagues.