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UnitedMasters

Lead Site Reliability Engineer

UnitedMasters
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senior full-time $195,000 - $240,000 San Francisco

First indexed 17 Oct 2026

Description

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.

Responsibilities:

  • 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, supply-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.

Requirements:

  • 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.
  • 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.
This listing is enriched and indexed by YubHub. To apply, use the employer's original posting: https://job-boards.greenhouse.io/unitedmasterstranslation/jobs/8895093002