Senior Software Engineer - Identity and Access Management

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.

How you will make an impact

As a Senior Software Engineer, you will lead complex projects across several components while staying hands-on with the software. You will:

 

• 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.

Who you are

• You have 7+ years of experience building and operating production software.

• You have hands-on experience developing production services in Go or Python.

• You have experience with authentication, authorization, identity, or related security systems.

• You have built networking systems, API gateways, APIs, or SDKs.

• You have led complex projects that spanned multiple engineers and several months.

• You take end-to-end ownership and stay with your work after launch.

• You communicate clearly, work well across teams, and make practical technical decisions.

• You mentor other engineers and raise the quality bar through feedback and example.

• You balance long-term improvements with steady customer delivery.

Nice to have

• Experience with auth or policy systems.

• Experience