Software Engineer II, Infrastructure Security
Dublin, IE
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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.
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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.
How you'll make an impact
As a Software Engineer on the Infrastructure Security team, you will build and operate the systems that help Klaviyo engineers ship secure software with confidence.
You will:
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
Who you are
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
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:
MySQL / Redis / Memcached
Location & Work Model
This 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 committed to a policy of equal opportunity and non-discrimination.
We do not discriminate on the basis of race, ethnicity, citizenship, national origin, color, religion or religious creed, age, sex (including pregnancy), gender identity, sexual orientation, physical or mental disability, veteran or active military status, marital status, criminal record, genetics, retaliation, sexual harassment or any other characteristic protected by applicable law.
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