Software Engineer II Organizations

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Team overview

The Core Infrastructure - Identity & Organizations (Core IO) pillar owns the foundational substrate for identity access organizations and platform integrity at Klaviyo. We manage the critical path of the user journey from login to enforcing permissions to operating within the correct organization and regional context so that the rest of the platform can move fast and stay secure.

Within Core IO the Organizations team owns the data model and platform APIs that define what a customers account looks like inside Klaviyo and what it is allowed to do. We build and operate the services that power multi-account experiences enterprise account hierarchies organization-level lifecycle and policy enforcement and the onboarding and settings layer for every customer. Our systems are foundational dependencies for nearly every product team at Klaviyo.

Why this role is exciting

• Shape Klaviyos enterprise organization platform: We are designing and shipping the multi-level organization hierarchy that large multi-brand enterprise customers need-platform work that will define how Klaviyo serves its most strategic customers for years to come.
• Unlock global scale and compliance: Your work directly supports Klaviyos international expansion and compliance requirements-including Data Residency for customers worldwide
• Platform-level leverage: The organization and account services your team owns are called by analytics billing messaging identity and nearly every product surface. Well-designed APIs or data models from this team multiplies engineering velocity across the company.
• Deep domain and systems learning: You will get hands-on exposure to distributed systems complex data modeling tenant and hierarchy management organization-level policy evaluation and full-stack development across Go services Python APIs and React frontends-with mentorship and meaningful ownership.

What youll do

As a Software Engineer II on the Organizations team you will:

• Own features end-to-end across design implementation rollout and observability for core account and organization capabilities such as hierarchy management account lifecycle organization-scoped settings and multi-account experiences for agencies and enterprise customers.
• Help build and evolve the organization hierarchy platform: Design and implement the APIs data models and services that represent multi-level enterprise structures including hierarchy traversal and event-driven lifecycle for downstream systems.
• Contribute to organization-level policy infrastructure: Help design and extend the system that determines what an account is capable of-translating organization status plan entitlements and compliance requirements into clear auditable answers for the rest of the platform.
• Support Data Residency and compliance initiatives: Build organization-aware primitives that help Klaviyo route data and enforce region-specific and compliance requirements at the account level.
• Contribute to service extraction and platform migration: Help move core account and organization logic from our legacy monolith into dedicated services and client libraries-unlocking faster iteration and stronger contracts for product teams.
• Define and refine standards for how the rest of the platform interacts with organization data-API contracts event schemas audit logging patterns and integration conventions-so teams across Klaviyo dont solve these problems independently.
• Collaborate closely with partner teams: Work with Identity & Access Management (IAM) to ensure organization policies and identity permissions compose cleanly and with Platform Integrity & Protection (PAA) on lifecycle controls that support account security and anti-abuse.
• Build and maintain shared contracts and SDKs so other product teams can consume organization data and policies safely making correct usage the path of least resistance.
• Improve reliability and performance of organization services by instrumenting metrics and alerts debugging production issues and contributing to on-call rotations and incident reviews.

Who you are

You are a mid-level software engineer who has shipped and supported production systems and who is excited about data modeling platform APIs and building infrastructure that other engineers depend on.

• Experienced systems builder: You have 2-5 years of professional software engineering experience including building and operating backend or full-stack services in production.
• Strong fundamentals and debugging skills: You are comfortable reasoning about data models API design concurrency and failure modes and you can dig through logs metrics and traces to identify root causes and implement systemic fixes.
• Domain modeling and platform mindset: You enjoy modeling complex real-world entities-accounts organizations hierarchies lifecycle states-as well-typed data structures and APIs that other teams can rely on. You like building reusable services and internal libraries that raise the floor for correctness and consistency across the organization.
• Breadth across the stack: You are comfortable contributing across backend services internal APIs and product-facing frontend surfaces. You may have a home base in one layer but you are not intimidated by the others.
• Ownership and collaboration: You take responsibility for outcomes not just code. You are comfortable driving a project end-to-end partnering with teams across the pillar and communicating trade-offs clearly in design docs and pull requests.
• Youve already experimented with AI in work or personal projects and youre excited to dive in and learn fast. Youre hungry to responsibly explore new AI tools and workflows.

Minimum qualifications

• 2-5 years of professional software engineering experience.
• Proficiency in at least one of Python Go or TypeScript/JavaScript and comfort working on backend and/or service-oriented systems including web services or APIs backed by relational databases and/or caches (e.g. MySQL Postgres Redis).
• Strong intuition for data modeling and API design including thinking through correctness backward compatibility and how downstream consumers will use your interfaces.
• Exposure to CI/CD pipelines and modern development workflows (code review testing deployments on-call participation or support).

Nice to have

You dont need all of these but experience in any of the following is a bonus:

• Experience with hierarchical or graph-structured data models (e.g. tree structures parent-child relationships org charts) and the consistency and performance challenges they introduce.
• Familiarity with multi-tenancy patterns in SaaS products including data isolation tenant-scoped configuration and cross-tenant operations.
• Working with cloud-native infrastructure (AWS Kubernetes Terraform or similar) and building services designed to run at scale.
• Exposure to compliance or data residency requirements (GDPR regional data isolation) and how they shape platform and data architecture decisions.
• Familiarity with observability stacks (Grafana Datadog Splunk) and using them to drive reliability improvements.
• Interest or experience in adjacent Core IO domains like Identity & Access Management or Platform Anti-Abuse especially where they intersect with account security access control and organization-level policy.

Technologies we use (not exhaustive)

Many of these youll use on day one; others youll have opportunities to learn:

• Languages & frameworks: Python Django Go TypeScript/React.
• Infrastructure & platform: AWS Kubernetes Terraform internal service platform for organizations and identity.
• Data & observability: MySQL Redis Kafka/event-driven messaging Grafana Splunk internal logging and metrics pipelines.

About Klaviyo

Klaviyo is a world-leading marketing automation platform that helps online businesses grow by building direct high-fidelity relationships with their customers over owned channels like email SMS and web. We make it easy for brands to store access analyze and act on their data to power highly targeted communications and long-term customer value.

This is a full-time onsite role based at Klaviyos headquarters in Boston MA.

Klaviyo is committed to building a diverse and inclusive team and does not tolerate discrimination harassment or retaliation of any kind.