Senior Software Engineer - Developer Infrastructure

• High-Leverage Work: You are not just building features; you are building the systems that determine how fast every engineer at Klaviyo can ship.
• Real Architectural Impact: You will influence the structure of a large, complex backend codebase and make decisions that scale with the company.
• Innovation at the Edge: You will have the autonomy to experiment with AI and emerging tooling to solve hard problems in dependency management, build performance, and developer experience.

• Experienced Engineer: You have 5+ years of software engineering experience with strong computer science fundamentals and a focus on clean, maintainable, well-architected code.
• Analytical Problem Solver: You don't just fix symptoms — you hunt down root causes, implement systemic fixes, and build in safeguards to prevent recurrence.
• Platform-Minded: You are comfortable reasoning about distributed systems, dependency graphs, and the downstream impact of platform-level decisions across many teams.
• Technical Generalist: You can move across the stack when needed — whether debugging a Python integration, optimizing a Go service, or wiring up infrastructure automation.
• AI Enthusiast: You have already experimented with AI in your work or personal projects and are eager to find ways to use it to make your work smarter and more efficient.
• Extreme Ownership: You take pride in the end-to-end health of the platform and proactively advocate for engineering excellence.

Technologies we use (not exhaustive):

• Infrastructure and CI: AWS, Kubernetes, Terraform, Helm, Buildkite, Pants

• AI Tools: Claude, Cursor, Copilot, or internal AI enablement frameworks

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 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 benefits based on eligibility.

Your recruiter can provide more details about the specific salary/OTE range for your preferred location during the hiring process.

This role may require up to 10% travel for purposes such as new hire onboarding, client or partner work if applicable, team meetings, and industry events.

Travel is coordinated in advance.

We’re Klaviyo (pronounced clay-vee-oh).

We empower creators to own their destiny by making first-party data accessible and actionable like never before.

We see limitless potential for the technology we’re developing to nurture personalized experiences in ecommerce and beyond.

To reach our goals, we need our own crew of remarkable creators—ambitious and collaborative teammates who stay focused on our north star: delighting our customers.

If you’re ready to do the best work of your career, where you’ll be welcomed as your whole self from day one and supported with generous benefits, we hope you’ll join us.

AI fluency at Klaviyo includes responsible use of AI (including privacy, security, bias awareness, and human-in-the-loop).

We provide accommodations as needed.

By participating in Klaviyo’s interview process, you acknowledge that you have read, understood, and will adhere to our Guidelines for using AI in the Klaviyo interview Process.

For more information about how we process your personal data, see our Job Applicant Privacy Notice.

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.