Senior Software Engineer - Identity and Access Management

Klaviyo•Boston, MA

About The Position

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. Senior Software Engineer, Identity and Access Management At Klaviyo, we value the different backgrounds, experiences, and perspectives that each Klaviyo brings to work. If you are close, but not an exact match, we hope you will still apply. About the team Identity and Access Management (IAM) controls how people, services, integrations, and AI agents access Klaviyo. We build authentication and authorization for users, agents, and machines that access the Klaviyo platform. This is a chance to solve hard identity problems that affect nearly every part of our product.

Requirements

7+ years of experience building and operating production software.
Hands-on experience developing production services in Go or Python.
Experience with authentication, authorization, identity, or related security systems.
Built networking systems, API gateways, APIs, or SDKs.
Led complex projects that spanned multiple engineers and several months.
Take end-to-end ownership and stay with your work after launch.
Communicate clearly, work well across teams, and make practical technical decisions.
Mentor other engineers and raise the quality bar through feedback and example.
Balance long-term improvements with steady customer delivery.

Nice To Haves

Experience with auth or policy systems.
Experience building secure platforms used by other engineering teams.
Experience with AWS, Terraform, Kubernetes, React, or Django.
Experience with enterprise security, auditability, data residency, or compliance needs.

Responsibilities

Lead business-critical projects from design through launch and long-term operation.
Build secure, reliable services for authentication, authorization, delegation, auditing, and revocation.
Break ambiguous problems into clear work that several engineers can deliver together.
Own the customer impact, reliability, and technical quality of your work in production.
Improve the architecture of your area as scale, security, and product needs change.
Define and maintain SLOs for the systems that you own.
Partner with Security, Product, Platform, and product engineering teams.
Create reusable patterns that make IAM easier and safer for other teams to adopt.
Mentor engineers and help project contributors succeed.
Apply new engineering and AI tools responsibly, then share what you learn with the team.
Take on important unowned work that helps the team move faster.