Software Engineer II - Developer Infrastructure

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 careers.klaviyo.com to see how we empower creators to own their own destiny.

Klaviyo is growing fast and we have openings for all skill levels across all of our teams. Learn more about our engineering culture at https://klaviyo.tech

Developer Infrastructure at Klaviyo is a force multiplier organization. It’s our job to make sure that engineers can ship quickly, confidently, and with minimal friction. The team builds foundational backend services as well as tooling and automation to allow product teams to test and release their software reliably and predictably. Engineers in Developer Infrastructure are team players who work collaboratively amongst themselves and with engineers from product teams to build the platform Klaviyo relies on to power its products.

As a Software Engineer in Developer Infrastructure you will own multiple foundational Klaviyo services and make a big impact on the productivity of our product engineering teams.

How you will make a difference:

• Ship foundational 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 internal developer productivity tooling
• Achieve break-throughs in systems throughput by identifying and eliminating bottlenecks
• Leverage technology such as Python, Go, Bash, Django, AWS, Kubernetes, Terraform, MySQL, Apache Pulsar, Redis, and Clickhouse to advance Klaviyo’s platform
• Champion best practices by actively collaborating with other teams in a culture that values 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.
• Participate in periodic on call duties with a focus on solving issues when they are discovered, preventing recurrences and minimizing alert fatigue 
• Work hand-in-hand with product-facing engineers to ship impactful code
• Perform quantitative analysis 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 decisions in a fast paced environment with competing priorities
• Evangelize software development best practices across the engineering organization

Who You Are:

• BA or BS Degree in Computer Science, related field, or equivalent experience
• 4+ years of responsibility operating & scaling complex distributed systems
• Experience developing applications in Python, Ruby, Go, etc.
• Experience working on an engineering team building software
• Experience working on developer productivity tooling (local development, CI/CD, build systems)
• You’ve already experimented with AI in work or personal projects, and you’re excited to dive in and learn fast. You’re hungry to responsibly explore new AI tools and workflows, finding ways to make your work smarter and more efficient.

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

Massachusetts Applicants:
It is unlawful in Massachusetts to require or administer a lie detector test as a condition of employment or continued employment. An employer who violates this law shall be subject to criminal penalties and civil liability.

Our salary range reflects the cost of labor across various U.S. geographic markets. The range displayed below reflects the minimum and maximum target salaries for the position across all our US locations. The base salary o