Senior Software Engineer, Infrastructure Security

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

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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 default, seamless, and effortless, making engineers’ lives better and Klaviyo more secure.

Our work spans security, infrastructure, and software development, requiring us to understand systems and engineering. We build complex, foundational solutions that must be extremely reliable, secure, and performant at global scale.

This role is for senior engineers who enjoy turning real-world problems into reliable, scalable solutions. The work is highly visible and has a direct impact on how hundreds of Klaviyos get their work done every day, and 100’s of thousands of customers use our products with confidence.

How you’ll make an impact

The Infrastructure Security team builds the internal platforms, systems, and services that serve as the foundational building blocks for how our engineers build securely every day. As a Senior Software Engineer on Infrastructure Security, you will:

Ship foundational security services to enable Klaviyo engineering to move faster with confidence

Design and develop systems and processes that enable highly available & scalable systems

Design, build and deliver software to dramatically improve the availability, scalability, latency, and efficiency of Klaviyo’s services

Achieve break-throughs in systems throughput by identifying and eliminating bottlenecks

Leverage technology such as Python, Golang, AWS, Django, Kubernetes, Bash, Terraform, MySQL, Redis, Clickhouse, Iceberg, DataLake, Istio, Postgresql, and more to advance Klaviyo’s platform

Champion best practices by actively collaborating with other teams in a culture that values whiteboarding and technical design review

Contribute to the company as a subject matter expert in multiple areas, constantly pushing yourself to be a better engineer and to level up all of your peers within your team and within Klaviyo.

Mentor and pair with other Klaviyo engineers to build better software by focusing on performance, self-healing system, configuration as code; defensive programming, application security, etc.

Participate in periodic on call duties with a focus on solving issues when they are discovered, preventing recurrences and minimizing alert fatigue

Prototype and advocate for architectural improvements to achieve breakthrough results in Klaviyo systems’ operational scalability and reliability

Work hand-in-hand with product-facing engineers to ship impactful code

Perform quantitative investigation to understand and scale Klaviyo systems and manage the cross-functional effort to resolve scalability issues

Produce and advocate for preventative, upstream solutions with internal stakeholders and external vendors and dependencies

Confidently make informed, data-driven choices in a fast paced environment with competing priorities

Who you are

You care deeply about building software for the long term, balancing technical quality, delivery pace, and business impact.

You have strong hands on experience with Linux operating systems and computer networking

You’re comfortable and experienced writing code in a programming language such as Python, Ruby, Go, etc.

You have deep experience with cloud infrastructure, operating in a high scale environment

You have strong hands-on experience building and operating highly available systems, and are c