Lead Site Reliability Engineer

• 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
• 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

Benefits

• Health & Well-being: Our health plans provide comprehensive coverage for you and your family. We offer robust medical, dental and vision benefits, with the option to enroll in FSA and HSA to save for the care you need. Plus, you can get free fitness classes through insurance, and healthy snacks at our offices
• Emotional & Mental Well-being: Focus on mental health and well-being has become more important than ever. We offer a spectrum of support for your mental well-being; from Headspace mindfulness and meditation, to free therapy and psychiatry at Talkspace
• Financial Well-being: Every full-time employee is eligible to take part in our 401(k) with company match, and competitive compensation
• Flexibility & Time Off: We believe that flexible time off allows our team members the freedom to balance the responsibilities of both their work and home lives. We also have 15 paid holidays and a paid company winter break. We offer generous paid leave and support for expecting parents and growing families
• Discounts & Perks: We want you to feel your best, both professionally and personally. We’re proud to offer inspiring office spaces with engaging events, commuter benefits, and discounts on the services you want and need

• Strong software engineering fundamentals. You build tools and systems, not just configure them
• Senior-to-staff experience as an SRE, platform, or infrastructure engineer, owning production reliability at scale
• A coaching instinct: you measure impact by how much you raise the teams around you
• 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