Software Engineer II - Environments

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.

Why You Should Join the Environments Team

Engineering confidence is our primary product. As a 300+ engineer organization, our biggest constraint isn't writing code, it's verifying it. The Environments team takes on that verification bottleneck by building safe, production-like ephemeral environments that any engineer can spin up on demand. We give engineers a high-fidelity place to test their changes against real-world conditions before they ever reach production, so the company can move fast without breaking things.

As a Software Engineer II on the team, you will help build the tools and systems that make these short-lived, fully provisioned environments fast, reliable, and easy to adopt. Your work directly shortens the path from "code written" to "verified and shipped" for every engineer at the company.

What You'll Do: Key Responsibilities

As a core member of the team, you will own the execution of meaningful projects and contribute to the evolution of our environment platform:

• Build Production-Like Environments: Develop and maintain the tooling that provisions safe, prod-parity ephemeral environments on demand, writing clean, well-tested code with guidance and code review from senior engineers.
• Reduce the Verification Bottleneck: Contribute features that make environments faster to spin up and easier to trust, so engineers can verify changes in a safe, isolated environment instead of waiting on slow, manual setup.
• Enable Self-Service Onboarding: Build on our existing self-service tooling so product teams can onboard their own services into ephemeral environments with even less manual configuration, eliminating "it works on my machine" friction.
• Solve Data and Isolation Challenges: Build systems for production-like data seeding, sanitization, and service isolation so that each environment is high-fidelity, secure, and independent.
• Support Multi-Service and Reproducible Setups: Help our platform handle complex, multi-service architectures and work toward "reproducible anywhere" environments that behave consistently across cloud and local development.
• AI-Driven Innovation: Help explore and implement AI-powered tooling that accelerates environment provisioning and setup, shortening the time it takes engineers to get a ready-to-use environment.
• Operational Excellence: Help maintain the health of our environment platform, including automated cleanup (reaping), cost-tracking, and observability for transient infrastructure.
• Partner Across Teams: Work closely with product and platform teams as they onboard their services, gathering feedback, supporting adoption, and coordinating dependencies so environments work well for everyone who relies on them.

What Makes This Role Exciting

• Direct Impact on Velocity: Your work removes the single biggest drag on a large engineering org: the time it takes to confidently verify a change. When engineers ship faster and safer, it is because of the systems you help build.
• Full-Stack Visibility: Because environments span our entire ecosystem, you will gain a deep understanding of how everything fits together, from frontend UI to backend services.
• Autonomy and Growth: While we provide the vision, you provide the execution. You will have the space to own your work end-to-end, propose technical improvements, and see them adopted across the org.
• High-Leverage Work: You are not building one feature for one customer. You are building the platform that hundreds of your fellow engineers rely on every single day.

Who You Are

• Analytical Problem Solver: You have 2+ years of software engineering experience with a focus on writing clean, maintainable code. You enjoy debugging complex issues and using those learnings to make systemic improvements.
• Infrastructure Curiosity: You have hands-on or learning experience with some of Kubernetes, Terraform, and the AWS ecosystem (EC2, RDS, networking), and you want to deepen it.
• Technical Generalist: You are comfortable working across the stack. Whether it is building a self-service interface in React and TypeScript or developing a backend service in Python/Django, you are ready to dive in.
• Internal Product Mindset: You treat the platform as a product whose customers are other engineers, and you care about making environments easy for other teams to adopt.
• Quality and Testing Mindset: You understand that high-fidelity environments are what make testing trustworthy, and you see giving engineers a reliable place to verify their work as core to the development lifecycle.
• AI-First Engineer: You are well past experimenting with AI. You already use AI tools to write the majority of your code, and you are fluent at directing, reviewing, and shipping AI-generated work responsibly. You actively look for new ways to apply AI to move faster without sacrificing quality.
• Ownership Mindset: You do not just wait for tickets. You look for ways to make things better and take pride in owning a project from the initial PR through deployment and monitoring.

Technologies We Use (not exhaustive)

• Backend: Python, Go
• Infrastructure: AWS (EKS, RDS, Aurora), Kubernetes, Terraform, Helm
• Data and Messaging: MySQL, Redis, Pulsar, Kafka
• Frontend: React, TypeScript, JavaScript, HTML, CSS
• AI Tools: Integration with 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.

Get to Know Klaviyo

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.