Senior Software Engineer - Identity & Access | Klaviyo Jobs

The Briefed; Boston (MA); On-site; USD 148,000 - 222,000; Full time

Benefits offered by this job

Annual bonus plan

Equity

Sign-on payments

Job summary

Klaviyo is seeking a Senior Software Engineer to lead the Identity and Access Management (IAM) effort. You will own complex, production-grade services for authentication, authorization, and auditing, while staying hands-on with code and mentoring teammates.

You will drive design, reliability, and security across multiple components, partner with Security and Platform teams, and craft patterns to simplify IAM adoption for other teams. This role requires initiative and end-to-end accountability.

Qualifications

• 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.
• Experience building networking systems, API gateways, APIs, or SDKs.
• Experience leading complex projects that spanned multiple engineers and several months.
• End-to-end ownership, staying with your work after launch.

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 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 and share what you learn with the team.
• Take on important unowned work that helps the team move faster

Skills

Go

Python

Authentication/Identity systems

API gateways/APIs/SDKs

Networking systems

SLO/production operations

Tools

AWS

Terraform

Kubernetes

React

Django

Job description

The Identity and Access Management (IAM) team controls how people, services, integrations, and AI agents access Klaviyo. As a Senior Software Engineer, you will lead complex, business-critical projects across several components while staying hands-on with the code. You will solve hard identity problems that affect nearly every part of the product.

Key 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 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 and share what you learn with the team
• Take on important unowned work that helps the team move faster

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
• Experience building networking systems, API gateways, APIs, or SDKs
• Experience leading complex projects that spanned multiple engineers and several months
• End-to-end ownership, staying with your work after launch

Skills

Technical Skills

• Go or Python
• Authentication, authorization, and identity systems
• API gateways, APIs, SDKs, and networking systems
• SLO definition and production operations

Soft Skills

• Clear communication and cross-team collaboration
• Practical technical decision-making
• Mentoring and raising the quality bar
• Balancing long-term improvements with steady customer delivery

Nice to Have

• 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

Job Details

• Location: Not specified (US locations; up to 10% travel for onboarding, team meetings, and events)
• Job Type: Not specified
• Work Mode: Not specified
• Salary: $148,000 - $222,000 USD base (varies by location, skills, and experience)

Benefits

• Annual cash bonus plan, equity, and sign-on payments (based on eligibility)
• Comprehensive health, welfare, and wellbeing benefits