Requirements

You have 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 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 communicate clearly, collaborate well, and enjoy working through technical problems as a team
You regularly use modern developer tooling, including AI-powered tools, to improve productivity and code quality

Nice to have

Experience building or integrating security-focused systems (e.g. secrets management, IAM, authn/z, policy enforcement)
Familiarity with service meshes, API gateways, or zero-trust architectures
Experience improving performance in distributed systems or debugging complex multi-service workflows

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 the availability, scalability, latency, and efficiency of infrastructure security systems
Collaborate with senior engineers on system design and architecture, contributing ideas and technical solutions
Identify performance, reliability, and security issues in distributed systems and drive improvements
Work extensively with technologies such as Python, Golang, AWS, Kubernetes, Terraform, and modern data stores
Participate actively in design reviews, code reviews, and whiteboarding sessions
Contribute to operational excellence through monitoring, alerting, and incident response
Participate in an on-call rotation with a focus on learning, prevention, and reducing operational toil
Build tooling, automation, and documentation that improve developer experience and security posture
Partner with product-facing and platform engineers to ship impactful, secure solutions