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.

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 .