Software Engineer II - Billing

When you hear billing, chances are you might think of a dusty corner office with several decade old file cabinets. Klaviyo’s Billing & Monetization team is not that! We oversee the payments and enforcement infrastructure that allow hundreds of thousands of companies to send billions of emails and text messages on BFCM weekend. The team is responsible for tracking all product usage to bill customers, managing customer subscriptions and payments, and pricing for new and existing products. As Klaviyo continues to scale, our team will play an instrumental role in capturing revenue (both domestic and international), building features that help users understand where their dollar spend goes, complying with regulatory requirements, facilitating internationalization and assisting in all pricing related changes at Klaviyo.

The Billing & Monetization team is seeking a Software Engineer II to help drive Klaviyo forward in its mission to offer entrepreneurs the best possible tooling at the lowest possible price. You will drive outcomes and decisions directly related to Klaviyo’s growth in international markets, its relationship with large customers with multiple subsidiaries and unique payment requests, how new products are priced and packaged and more.

• Own customer facing products that help customers better understand how they are billed on Klaviyo. 
• Develop new approaches to track billions of product usage events accurately and reliably.
• Work with Klaviyo customers and stakeholders to build a platform that maximizes value for our customers and for Klaviyo. 
• Make decisions and own outcomes around infrastructure, application logic, documentation, product changes, UI and more

• You have a track record of building high quality products and systems. You take pride in writing clean, high quality code. 
• 3+ years of experience as a software engineer
• Previous experience RESTful APIs, pub/sub systems, and 3rd party integrations 
• You have some experience developing full stack products. 
• Experience working on team projects and/or leading projects.
• You’re excited to use AI-assisted development tools thoughtfully to move faster, improve code quality, and accelerate learning, while applying strong engineering judgment. 

• Experience building payment systems and or integrating with payment providers.
• Experience working with cross functional teams on bringing products to market, financial reconciliation, etc 
• Passion for understanding and experimenting with the levers that drive business outcomes, including pricing, presentation, vendor relationships and more.
• Experience talking to customers and listening deeply to their wants and needs.

We currently use the list of technologies below but are always looking to find the best tools for the jobs that help our customers (and very open to adding technologies given the right circumstances). We don’t expect you to have any experience in the tools below and we will provide whatever training you need to level up and succeed!

• Python, Django, React, Typescript
• Pulsar, Celery
• MySQL, Redis, Memcached
• AWS (EC2, RDS, S3, etc.), Terraform

We use Covey as part of our hiring and / or promotional process. For jobs or candidates in NYC, certain features may qualify it as an AEDT. As part of the evaluation process we provide Covey with job requirements and candidate submitted applications. We began using Covey Scout for Inbound on April 3, 2025.

Please see the independent bias audit report covering our use of Covey here