Senior Software Engineer, Platform Engineering

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 youre a close but not exact match with the description we hope youll still consider applying. Want to learn more about life at Klaviyo Visit see how we empower creators to own their own destiny.

The mission of the Platform Engineering team is to provide infrastructure primitives platforms tooling and guidance to Klaviyo role will specifically focus on our core platform services and developer experience with an emphasis on making Klaviyos platforms more cost-efficient at scale.

As a Senior Platform Engineer youll work on crafting a paved path for product teams to manage their services and applications. You will own the design and development of foundational platform services that enable Klaviyos engineering teams to move faster with confidence while driving down the cost of running our infrastructure.

How you will make a difference:

• Ship foundational services to enable Klaviyo engineering to move faster with confidence.
• Build a deep understanding of engineering needs across the organization guiding the design and development of appropriate platform primitives (Infra Databases Queuing etc) that align with the platforms vision and practically empower product teams.
• Design develop and deliver software to dramatically improve the availability scalability latency and cost efficiency of Klaviyos core platforms helping teams to better serve customers operate within budget and meet their SLOs.
• Design and develop systems and processes that enable highly available and scalable applications.
• Leverage technology such as Python Go AWS and Kubernetes to advance Klaviyos platform.
• Mentor and pair with other Klaviyo engineers to build better software by focusing on performance self-healing systems configuration as code and defensive programming.
• Identify and drive cost-optimization opportunities across the platform right-sizing infrastructure improving resource utilization and building tooling and guardrails that make cost efficiency the default for product teams

Who You Are:

• BA or BS Degree in Computer Science related field or equivalent experience.
• 5 years of responsibility operating and scaling complex distributed systems.
• Experience working in a cloud-native environment.
• Proven experience developing applications in Python and Go.
• Fundamental understanding of Linux and all layers of the networking stack.
• Experience in a subset of platform-related areas such as Kubernetes infrastructure as code API gateways & traffic management observability or asynchronous processing tooling.
• Exposure to or interest in measuring and optimizing infrastructure cost and utilization
• Familiarity with high-volume data processing and storage systems and with OLTP and OLAP databases.
• Experience with large scale data ecosystems e.g. ClickHouse DynamoDB MySQL Kafka Spark Flink Iceberg or Airflow