Senior Software Engineer - Identity and Access Management

Klaviyo is seeking a Senior Software Engineer to join their Identity and Access Management (IAM) team within the Core Infrastructure – Identity & Organizations (Core IO) pillar. This team is responsible for building and operating Klaviyo's centralized authentication and authorization platform, which includes services such as login, Single Sign-On (SSO), Multi-Factor Authentication (MFA), and internal service authentication. The role is based in Boston, MA, and requires a commitment to working in the office five days a week.

In this position, the Senior Software Engineer will design and develop cloud-native security services used across Klaviyo. Responsibilities include building and maintaining services that power login, sessions, permissions, and secure service APIs. The engineer will collaborate with senior engineers on system design and architecture, contribute to operational excellence through monitoring and incident response, and participate in an on-call rotation. Additionally, the role involves mentoring and pairing with other engineers to build better software by focusing on performance, self-healing systems, and defensive programming.

Candidates should have at least 6 years of experience building and operating cloud-native, distributed systems in production. Proficiency in Python or Go is required, along with hands-on experience with AWS and understanding of managed services, networking, and IAM concepts. Experience with containers and orchestration platforms such as Kubernetes, as well as writing infrastructure as code using tools like Terraform, is also necessary. A fundamental understanding of Linux and all layers of the networking stack is expected.

While specific compensation details are not provided, Klaviyo offers a comprehensive benefits package that includes health, welfare, and wellbeing benefits based on eligibility. The company emphasizes a collaborative and inclusive culture, encouraging applicants from diverse backgrounds to apply.

Klaviyo is committed to empowering creators by making first-party data accessible and actionable. The company values unique backgrounds, experiences, and perspectives, fostering an environment where everyone deserves a fair shot at success. Applicants are encouraged to consider applying even if they are a close but not exact match with the job description.