Senior Software Engineer, Infrastructure Security | Klaviyo

Klaviyo’s Infrastructure Security team makes it simple for engineers to make secure choices while building software at high speed, with security built in by default. As a Senior Software Engineer, you will build and operate cloud-native security platforms and services that are reliable, secure, and performant at global scale. This role suits engineers who enjoy modern distributed systems, care about security and reliability, and want real impact across a large engineering organization.

Key Responsibilities

• Design, build, and maintain cloud-native security services used across Klaviyo
• Own 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
• Identify and fix performance, reliability, and security issues in distributed systems
• Work extensively with Python, Golang, AWS, Kubernetes, Terraform, and modern data stores
• Participate in design reviews, code reviews, and whiteboarding sessions
• Contribute to operational excellence through monitoring, alerting, and incident response, including an on-call rotation focused on learning, prevention, and reducing toil
• Build tooling, automation, and documentation that improve developer experience and security posture
• Partner with product-facing and platform engineers to ship secure solutions

Requirements

• 6+ years of experience building and operating cloud-native, distributed systems in production
• Production-quality coding skills in Python or Go
• Hands-on experience with AWS (or a similar cloud provider), including managed services, networking, and IAM concepts
• Experience with containers and orchestration platforms such as Kubernetes
• Experience writing infrastructure as code, such as Terraform
• Understanding of scalable, multi-tenant architectures and secure system design
• Ability to own services independently, lead technical discussions, and write clear design documents and RFCs
• Ability to handle outages, drive root cause analysis, and prevent repeat failures
• Willingness to take part in on-call and respond to production issues
• Experience or interest in applying AI tools responsibly to your work

Skills

Technical Skills

• Python, Django, Golang, FastAPI
• AWS, Terraform, Kubernetes
• MySQL, Redis, Memcached
• RabbitMQ, Celery, Apache Kafka, Apache Pulsar
• Observability, monitoring, and incident response
• Scalable, multi-tenant, and secure system design

Soft Skills

• Communication and technical leadership
• Mentoring junior engineers
• Ownership and continuous improvement
• Collaboration on small, autonomous, agile teams

Nice to Have

• Experience building security tooling or working with security infrastructure such as Vault, AWS IAM, and WAFs
• Experience with service meshes, API gateways, or zero-trust architectures
• Experience improving performance in distributed systems or debugging complex multi-service workflows

Benefits

• Total compensation may include an annual cash bonus, equity, and sign-on payments, depending on eligibility
• Comprehensive health, welfare, and wellbeing benefits

How to Apply

Visit klaviyo.com/careers to learn more and apply. Legitimate Klaviyo communications come from @klaviyo.com addresses, and Klaviyo never asks for payment or bank details during the application process.