Klaviyo Senior Software Engineer on the Infrastructure Security team builds and operates cloud-native security services at Klaviyo. The role focuses on improving security, reliability, and performance of distributed systems.
Responsibilities
Design, build, and maintain cloud-native security services used across Klaviyo
Own meaningful components and services end to end, from implementation through production operation
Improve availability, scalability, latency, and efficiency of infrastructure security systems
Collaborate with senior engineers on system design and architecture
Identify performance, reliability, and security issues in distributed systems and drive improvements
Participate in design reviews, code reviews, and whiteboarding sessions
Contribute to operational excellence through monitoring, alerting, and incident response
Participate in an on-call rotation focused on learning, prevention, and reducing operational toil
Build tooling, automation, and documentation to improve developer experience and security posture
Partner with product-facing and platform engineers to ship impactful, secure solutions
Qualification
You care about reliabilityExperience building security toolingExperience with service meshesPython / Django / Golang / FastAPIMySQL / Redis / MemcachedAWS / Terraform / Kubernetes
Required
You have 6+ years of solid experience building and operating cloud-native, distributed systems in production
You are comfortable writing production-quality code in a language such as Python or Go
You have hands-on experience with AWS (or a similar cloud provider) and understand managed services, networking, and IAM concepts
You have experience working with containers and orchestration platforms such as Kubernetes
You have experience writing infrastructure as code using languages such as Terraform
You are comfortable owning services and features independently, while knowing when to ask for feedback or support
You understand the fundamentals of scalable, multi-tenant architectures and secure system design
You care about reliability, performance, observability, and security—not just shipping features
You are comfortable participating in on-call and responding to production issues
You are an excellent communicator and collaborator. You lead technical discussions at the project and product-area level, write clear technical design documents and RFCs, and keep stakeholders aligned on progress, risks, and trade-offs.
Ability to handle yourself and complex systems in outage situations and to drive failures to root cause analysis and prevention of future issues.
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.
Preferred
Experience building security tooling, working with security infrastructure systems like Vault, AWS IAM, WAFs, and more
Experience with service meshes, API gateways, or zero-trust architectures
Experience improving performance in distributed systems or debugging complex multi-service workflows
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. Core technologies include:
