Senior Software Engineer - Payment Systems

About the team

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. 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.

About the role

The Billing & Monetization team is seeking a Senior Software Engineer 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.

How you’ll make an impact

• Work with Klaviyo customers and stakeholders to build a platform that delivers best-in-class value at the lowest possible price
• Make decisions and own outcomes around infrastructure, application logic, documentation, product changes, UI and more
• Mentor new engineers and lead development of new teams

What we’re looking for:

• Track record of building for quality and precision. We take pride in our approach to testing new work and maintaining platform stability
• 5+ years of experience in a software engineering discipline
• Experience with one or more of the following: processing payments using third party APIs (with a focus on graceful handling of error cases), exposing/gating features based on paid tier levels, reconciling internal data with third party vendor data
• Previous experience handling in-app payment flows with a major payment processor (ex. PayPal, Stripe, Adyen, Plaid)
• Previous experience working with external or internal auditors or finance teams to verify how data sources tie to financial statements
• Experience leading projects across multiple teams or quarters

Nice to have:

• Track record of working on high visibility projects with requirements you have to actively seek out. Desire to be judged on measurable outcomes and change process to achieve those outcomes
• 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

Technologies we use (no experience necessary)

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!

Our current tech stack:

• Django, React
• Stripe, Avalara
• RabbitMQ, Celery
• MySQL, Redis, Memcached
• AWS (EC2, RDS, Aurora, S3, etc.), Kubernetes, Terraform, Jenkins