Software Engineer II, Infrastructure Security

Dublin, IrelandHybrid

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 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
Build tooling, automation, and documentation that improve developer experience and security posture

Work extensively with technologies such as Python, Golang, AWS, Kubernetes, Terraform, and modern data stores
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 understand the fundamentals of scalable, multi-tenant architectures and secure system design
You regularly use modern developer tooling, including AI-powered tools, to improve productivity and code quality Nice to have •
Familiarity with service meshes, API gateways, or zero-trust architectures •
Experience improving performance in distributed systems or debugging complex multi-service workflows Tech Stack
Klaviyo’s platform is primarily built with Python and React and runs on AWS.
Python / Django / FastAPI
MySQL / Redis / Memcached
RabbitMQ / Celery / Apache Kafka / Apache Pulsar
AWS / Terraform / Kubernetes Location & Work Model

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.
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
Your recruiter can provide more details about the specific salary/OTE range for your preferred location during the hiring process.
Base Pay Range in Local Currency: €76.000 — €114.000 EUR

Want to learn more about life at Klaviyo? Visit klaviyo.com/careers to see how we empower creators to own their own destiny. Team Overview

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.
The Infrastructure Security team makes it simple and easy for engineers to make secure choices while developing world-class software at high speed.
Security is built in by default—seamless and effortless—making engineers’ lives better and Klaviyo more secure.
Our work sits at the intersection of security, infrastructure, and software engineering.
We build cloud-native platforms and services that are reliable, secure, and performant at global scale, forming the foundation that Klaviyo engineers rely on every day.
This role is for engineers who enjoy building modern distributed systems, care about security and reliability, and want to have real impact across a large engineering organization.
Participate actively in design reviews, code reviews, and whiteboarding sessions
Contribute to operational excellence through monitoring, alerting, and incident response