Software Engineer II, Infrastructure Security
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Job Location:
Monthly Salary:
Posted on:
Yesterday
Vacancies:
1 Vacancy
Job Summary
Team Overview
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 defaultseamless and effortlessmaking 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 youll 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 securitynot 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
Tech Stack
Klaviyos 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:
- Python / Django / FastAPI
- MySQL / Redis / Memcached
- RabbitMQ / Celery / Apache Kafka / Apache Pulsar
- AWS / Terraform / Kubernetes
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.
We use Covey as part of our hiring and / or promotional process. For jobs or candidates in NYC certain features may qualify it as an AEDT. As part of the evaluation process we provide Covey with job requirements and candidate submitted applications. We began using Covey Scout for Inbound on April 3 2025.
Please see the independent bias audit report covering our use of Covey here
Required Experience:
IC
Key Skills
- Jenkins
- Ruby
- Python
- Active Directory
- Cloud
- PowerShell
- Windows
- AWS
- Linux
- SAN
- Java
- Troubleshoot
- Backup
- Puppet
- hardware
About Company
Klaviyo unifies AI-powered email marketing and SMS to drive growth, retention, and measurable results. Build personalized, omnichannel experiences across WhatsApp, ecommerce, and more with K:AI Agents.
