Lead Site Reliability Engineer at UnitedMasters in San Francisco, CA

Job description

Who We Are UnitedMasters UnitedMasters is building a marketplace that connects artists, brands and fans - empowering artists to earn and grow. UnitedMasters has taken the bold step of building a music distribution service that, radically, puts artists first - disrupting the legacy music business by letting up-and-coming artists distribute their music directly to fans through streaming services while maintaining ownership of their master recording rights and up to 100% of royalties. Through the combination of UnitedMasters' music distribution platform and its deep ties to brands, UnitedMasters enables independent artists and change-makers to grow and earn unlike any other platform. The UnitedMasters team is made up of musicians, marketers, engineers, and storytellers with backgrounds from YouTube, SoundCloud, Pandora, Facebook, Uber, Dropbox, Complex, VICE, and more. We work hand in hand with the award-winning creative teams that forge those innovative partnerships at Translation (our in-house creative advertising agency). The Role You'll partner with platform, data, QA, and product engineers across the organization, owning the intersection of reliability and security: the tooling, monitoring, alerting, emergency response, and systems design the whole org depends on. A defining part of the role is building how we protect our systems going forward. We're investing in agentic, AI-driven security pipelines that continuously detect, triage, and help remediate vulnerabilities across our codebase and infrastructure — and you'll lead the design and stewardship of that capability. Above all, though, this is a coaching and consulting role. We're looking for a strong listener, patient collaborator, thoughtful architect, and skilled builder — someone who identifies needs in reliability and security and empowers peer developers to improve them. What You'll Do Partner with platform, data, QA, and product teams to understand their automation, infrastructure, monitoring, and security needs. Build tooling and processes that solve the problems those conversations surface. Build and maintain an agentic vulnerability detection and mitigation pipeline that will scan, triage, and propose fixes, with human-in-the-loop guardrails. Embed security into the development lifecycle, including threat modeling, supp ly-chain hygiene, secrets management, secure-by-default patterns. Lead security and reliability incident response as first-class operational concerns. Define company-level SLAs, SLOs, and Error Budgets, and help teams set their own. Steer system design toward shared tooling and decisions that ensure reliability, scalability, security, and maintainability. Join the on-call rotation as a peer to spot process gaps and coach on response. Act as a senior escalation for infrastructure and security issues, helping resolve them while coaching teams to handle the next. Own our AWS infrastructure and set the long-term strategy for our reliability and security posture, balancing scalability and cost. Who You Are Senior-to-staff experience as an SRE, platform, or infrastructure engineer, owning production reliability at scale. Hands-on application and/or infrastructure security experience; enough to lead the security conversation without a separate security team in the room. Practical experience building with LLMs and agentic systems. You've shipped something real and understand their failure modes and where human oversight is non-negotiable. Strong software engineering fundamentals. You build tools and systems, not just configure them. A coaching instinct: you measure impact by how much you raise the teams around you. Our Values We Get on the Plane — Entrepreneurial spirit means fully committing to the journey not just having the idea. We Expect Challenge + Respect — We constantly challenge each other and the work to reach excellence, always with respect. We Are Defined by Our Resilience — We stay resourceful, fail fast, keep getting better, and never quit