OverviewAt 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 careers.klaviyo.com to see how we empower creators to own their own destiny.How You’ll Make An ImpactThe Infrastructure Security team builds the internal platforms, systems, and services that serve as the foundational building blocks for how our engineers build securely every day. As a Senior Software Engineer on Infrastructure Security, you will:Ship foundational security services to enable Klaviyo engineering to move faster with confidenceDesign and develop systems and processes that enable highly available & scalable systemsDesign, build and deliver software to dramatically improve the availability, scalability, latency, and efficiency of Klaviyo’s servicesAchieve break-throughs in systems throughput by identifying and eliminating bottlenecksLeverage technology such as Python, Golang, AWS, Django, Kubernetes, Bash, Terraform, MySQL, Redis, Clickhouse, Iceberg, DataLake, Istio, Postgresql, and more to advance Klaviyo’s platformChampion best practices by actively collaborating with other teams in a culture that values whiteboarding and technical design reviewContribute to the company as a subject matter expert in multiple areas, constantly pushing yourself to be a better engineer and to level up all of your peers within your team and within KlaviyoMentor and pair with other Klaviyo engineers to build better software by focusing on performance, self-healing system, configuration as code; defensive programming, application security, etc.Participate in periodic on call duties with a focus on solving issues when they are discovered, preventing recurrences and minimizing alert fatiguePrototype and advocate for architectural improvements to achieve breakthrough results in Klaviyo systems’ operational scalability and reliabilityWork hand-in-hand with product-facing engineers to ship impactful codePerform quantitative investigation to understand and scale Klaviyo systems and manage the cross-functional effort to resolve scalability issuesProduce and advocate for preventative, upstream solutions with internal stakeholders and external vendors and dependenciesConfidently make informed, data-driven choices in a fast paced environment with competing prioritiesWho You AreYou care deeply about building software for the long term, balancing technical quality, delivery pace, and business impactYou have strong hands on experience with Linux operating systems and computer networkingYou’re comfortable and experienced writing code in a programming language such as Python, Ruby, Go, etcYou have deep experience with cloud infrastructure, operating in a high scale environmentYou have strong hands-on experience building and operating highly available systems, and are comfortable owning complex problems end to endYou’ve led the delivery of significant projects or features independently, including discovery, technical design, implementation, rollout, and ongoing maintenance, and you’re comfortable providing technical direction to othersYou have deep expertise in one or more areas of modern web engineering (e.g. backend services, data pipelines, internal platforms, or AI-enabled systems) and a solid understanding of scalable, multi-tenant architecturesYou regularly use AI-powered tools in your development workflow and are curious about applying AI thoughtfully to improve engineering productivity and system capabilitiesYou take ownership of operational excellence for the systems you build, including performance, reliability, observability, and on-call participation where requiredYou enjoy questioning convention and continuously improving how things work, whether that’s architecture, tooling, workflows, or team practicesYou are a clear communicator and collaborative teammate, comfortable leading technical discussions, writing design docs or RFCs, and keeping stakeholders alignedYou enjoy working in small, autonomous, agile teams, shipping incrementally, and partnering closely with product managers and other engineers to deliver better outcomesNice To HaveExperience building security tooling, working with security infrastructure systems like Vault, AWS IAM, WAFs, and moreHands-on experience including diagnosing and improving systems performance, database queries, and complex, multi-service workflowsTech StackKlaviyo’s platform is primarily built with Python and React and runs on AWS. Core technologies include:Python / Django / FastAPIMySQL / Redis / MemcachedRabbitMQ / Celery / Apache Kafka / Apache PulsarAWS / Terraform / KubernetesLocation & Work ModelThis role is based in Dublin, Ireland and follows a hybrid working model. Klaviyo supports work authorization and relocation for this position.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.Klaviyo is growing fast and we have openings for all skill levels across all of our teams. Base Pay Range In Local Currency: €92,000—€138,000 EURGet to Know KlaviyoWe’re Klaviyo (pronounced clay-vee-oh). We empower creators to own their destiny by making first-party data accessible and actionable like never before. We see limitless potential for the technology we’re developing to nurture personalized experiences in ecommerce and beyond. To reach our goals, we need our own crew of remarkable creators—ambitious and collaborative teammates who stay focused on our north star: delighting our customers. If you’re ready to do the best work of your career, where you’ll be welcomed as your whole self from day one and supported with generous benefits, we hope you’ll join us.Important privacy and equal opportunity notices are provided as part of the application process. For more details about data privacy, equal opportunity, and compliance, please refer to our Job Applicant Privacy Notice.
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