<div class="content-intro"><p><em>At Klaviyo, we value the unique backgrounds, experiences and perspectives each Klaviyo (we call ourselves Klaviyos) brings to our workplace each and every day. We believe everyone deserves a fair shot at success and appreciate the experiences each person brings beyond the traditional job requirements. If you’re a close but not exact match with the description, we hope you’ll still consider applying. Want to learn more about life at Klaviyo? Visit <a class="_ymio1r31 _ypr0glyw _zcxs1o36 _mizu194a _1ah3dkaa _ra3xnqa1 _128mdkaa _1cvmnqa1 _4davt94y _4bfu18uv _1hms8stv _ajmmnqa1 _vchhusvi _kqswh2mm _ect4ttxp _syaz13af _1a3b18uv _4fpr8stv _5goinqa1 _f8pj13af _9oik18uv _1bnxglyw _jf4cnqa1 _30l313af _1nrm18uv _c2waglyw _1iohnqa1 _9h8h12zz _10531ra0 _1ien1ra0 _n0fx1ra0 _1vhv17z1" href="http://klaviyo.com/careers" data-renderer-mark="true">klaviyo.com/careers</a> to see how we empower creators to own their own destiny.</em></p></div><h2><strong>Lead Site Reliability Engineer – Site Reliability Engineering (Dublin)</strong></h2> <h3><strong>Team Overview</strong></h3> <p>As a Lead Site Reliability Engineer, you will set technical direction and lead reliability strategy for Klaviyo’s most critical platforms. You’ll ensure our systems are reliable, scalable, and sustainable while enabling rapid product development across the company.</p> <p>We treat reliability as a core product feature. Our work spans security, infrastructure, and software engineering, requiring deep systems thinking and strong technical leadership. We build foundational services that must be extremely reliable, secure, and performant at global scale.</p> <p>The SRE team’s charter is to design, build, and operate foundational infrastructure and services, define reliability standards, reduce operational toil through automation, and continuously improve systems based on production learnings. As a lead, your work will be highly visible and will directly influence how Klaviyo builds software and how customers experience our platform every day.</p> <h3><strong>How you’ll make an impact</strong></h3> <p>As a <strong>Lead Site Reliability Engineer</strong>, you will provide technical leadership while remaining hands-on with the systems that underpin Klaviyo’s reliability and operational excellence. You will:</p> <ul> <li>Set the technical vision and long-term strategy for reliability, availability, and operational excellence across critical platforms</li> <li>Lead the design, implementation, and evolution of foundational, security-critical services with strong guarantees around availability, scalability, latency, and fault tolerance</li> <li>Drive adoption of SRE best practices across engineering teams, including SLIs, SLOs, error budgets, and reliability-based decision making</li> <li>Identify systemic reliability risks and architectural bottlenecks, and lead cross-team initiatives to address them with durable, preventative solutions</li> <li>Apply software engineering principles to automate infrastructure, eliminate operational toil, and improve system reliability at scale</li> <li>Own and continuously improve observability, alerting, and incident response practices to reduce mean time to detection and recovery</li> <li>Guide on-call strategy and operational processes to ensure sustainability, automation, and healthy operational load</li> <li>Perform and lead quantitative analysis around system behavior, capacity planning, scaling limits, and performance characteristics</li> <li>Partner closely with product, platform, and security leaders to influence system architecture early and ensure reliability is built in from the start</li> <li>Lead incident response for high-severity events, driving effective mitigation, communication, and follow-up</li> <li>Mentor senior and mid-level engineers, raising the bar for technical quality, operational maturity, and reliability culture across the organization</li> <li>Review and influence technical designs, platform APIs, operational runbooks, and system documentation at an organizational level</li> <li>You’ve already experimented with AI in work or personal projects, and you’re excited to dive in and learn fast. You’re hungry to responsibly explore new AI tools and workflows, finding ways to make your work smarter and more efficient.</li> </ul> <h3><strong>Who you are</strong></h3> <p>You are a senior technical leader who combines deep systems expertise with strong judgment and influence.</p> <p>You:</p> <ul> <li>Are a cloud-native, platform-focused SRE who uses software to design and operate highly reliable production systems at scale</li> <li>Write and maintain production-quality code (e.g. Python, Go, or similar) to build internal platforms, automate operations, and improve system reliability</li> <li>Have led the design and operation of distributed, cloud-native systems and deeply understand failure modes such as partial outages, dependency failures, resource saturation, and cascading impact</li> <li>Have extensive experience operating containerized workloads and platforms (e.g. Kubernetes) in production, including deployment strategies, scaling behavior, and service networking</li> <li>Are comfortable owning on-call strategy and participating in escalation for complex production incidents</li> <li>Have designed and evolved observability platforms and alerting strategies that reflect real customer and service impact</li> <li>Apply SRE concepts such as SLIs, SLOs, error budgets, and burn-rate–based alerting to guide engineering priorities and trade-offs at a team or org level</li> <li>Have strong hands-on experience with infrastructure as code and declarative configuration (e.g. Terraform, Kubernetes manifests, policy-as-code)</li> <li>Have led capacity planning, load testing, and performance analysis efforts for large-scale distributed systems</li> <li>Drive high-quality post-incident reviews and ensure concrete, code-focused follow-up actions are delivered and sustained</li> <li>Are comfortable leading technical discussions, influencing architecture, and providing clear guidance across multiple teams</li> </ul> <h3><strong>Nice to have</strong></h3> <ul> <li>Experience leading or supporting critical platforms or internal tooling</li> <li>Familiarity with identity, access management, secrets management, or policy enforcement systems</li> <li>Experience operating systems at scale in cloud environments (AWS preferred)</li> <li>Background in resilience testing, fault injection, or chaos engineering</li> <li>Strong understanding of algorithms and data structures as they apply to large-scale systems<br><br></li> </ul> <h3><strong>Tech Stack</strong></h3> <p>Klaviyo’s platform is primarily built with Python and React and runs on AWS. Engineers join us from a wide range of technical backgrounds and are supported in learning our stack.</p> <p>Core technologies include:</p> <ul> <li>Python / Django / FastAPI</li> <li>MySQL / Redis / Memcached</li> <li>RabbitMQ / Celery / Apache Kafka / Apache Pulsar</li> <li>AWS / Terraform / Kubernetes<br><br></li> </ul> <h3><strong>Location & Work Model</strong></h3> <p>This role is based in Dublin, Ireland and follows a hybrid working model. Klaviyo supports work authorization and relocation for this position.</p> <p>At Klaviyo, we enjoy tackling meaningful engineering challenges and value people who take ownership, learn continuously, and collaborate openly. We are committed to building inclusive teams and encourage applications from candidates of all backgrounds.</p> <p><br><br></p><br><p>We use Covey as part of our hiring and / or promotional process. For jobs or candidates in NYC, certain features may qualify it as an AEDT. As part of the evaluation process we provide Covey with job requirements and candidate submitted applications. We began using <a href="https://getcovey.com/product/covey-scout-inbound">Covey Scout for Inbound</a> on April 3, 2025.</p><p>Please see the independent bias audit report covering our use of Covey <a href="https://getcovey.com/nyc-local-law-144" style="text-decoration:underline">here</a></p><div class="content-pay-transparency"><div class="pay-input"><div class="description"><p>Our salary range reflects the cost of labour in the country where the job post is advertised. The base salary offered for this position is determined by several factors, including the applicant’s job-related skills, relevant experience, education or training, and work location.</p> <p>In addition to base salary, our total compensation package may include participation in the company’s annual cash bonus plan, variable compensation (OTE) for sales and customer success roles, equity, sign-on payments, and a comprehensive range of health, welfare, and wellbeing benefits based on eligibility. </p> <p>Your recruiter can provide more details about the specific salary/OTE  range for your preferred locati

Lead SRE, Site Reliability Engineering