Lead Software Engineer, Platform Engineering

- BA or BS degree in Computer Science, related field, or equivalent experience

- 10+ years of experience designing, building, and operating large-scale distributed systems, with a track record of technical leadership

- Deep, hands-on experience developing production software in Python and/or Go

- Extensive experience working in cloud-native environments, with hands-on ownership of infrastructure as code (e.g. Terraform) and containerized platforms (e.g. Kubernetes)

- Fundamental understanding of Linux and all layers of the networking stack; comfortable administering and debugging production systems

- Experience across a range of platform-related domains such as API gateways & traffic management, observability, asynchronous processing, or database/storage platforms

- Proven ability to independently own the full lifecycle of complex, cross-team platform initiatives - from discovery and technical design through rollout and long-term maintenance

- Strong track record of mentoring engineers and influencing technical direction beyond your immediate team

- Excellent communicator who writes clear technical design docs and RFCs, and keeps stakeholders aligned on progress, risk, and trade-offs

- Comfortable handling complex systems in outage situations and driving failures to root cause and resolution

- Familiarity with high-volume data processing and storage systems, including OLTP and OLAP databases

- Experience with large-scale data ecosystems - e.g., ClickHouse, DynamoDB, MySQL, Kafka, Spark, Flink, Iceberg, or Airflow

- Background in internal tooling or paved-path platform design

Klaviyo's 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.

- Python / Django / FastAPI / Go

- MySQL / Redis / Memcached

- RabbitMQ / Celery / Apache Kafka / Apache Pulsar

- AWS / Terraform / Kubernetes

This role is based in Boston, Massachusetts. 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.

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

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.

$176,000 - $264,000 USD

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.

IMPORTANT NOTICE: Our company takes the security and privacy of job applicants very seriously. We will never ask for payment, bank details, or personal financial information as part of the application process. All our legitimate job postings can be found on our official career site.

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