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Senior Software Engineer - Billing



Software Engineering
Boston, MA, USA
Posted on Tuesday, June 4, 2024

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 to see how we empower creators to own their own destiny.

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:

  • You have a track record of building high quality products and systems. You take pride in writing clean, high quality code.
  • 7+ years of experience in a software engineering role
  • Previous experience RESTful APIs and 3rd party integrations (such as payment providers or processors).
  • You have some experience developing full stack products.
  • Experience working on team projects and/or leading projects.

Nice to have:

  • Experience building payments systems and or integrating with payment providers
  • Experience working with finance 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

Our current tech stack:

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

The pay range for this role is listed below. Sales roles are also eligible for variable compensation and hourly non-exempt roles are eligible for overtime in accordance with applicable law. This role is eligible for benefits, including: medical, dental and vision coverage, health savings accounts, flexible spending accounts, 401(k), flexible paid time off and company-paid holidays and a culture of learning that includes a learning allowance and access to a professional coaching service for all employees.

Base Pay Range For US Locations:
$156,800$235,200 USD

Get to Know Klaviyo

We’re Klaviyo (pronounced clay-vee-oh). We empower creators to own their destiny by making first-party data accessible and actionable like never before. We see limitless potential for the technology we’re developing to nurture personalized experiences in ecommerce and beyond. To reach our goals, we need our own crew of remarkable creators—ambitious and collaborative teammates who stay focused on our north star: delighting our customers. If you’re ready to do the best work of your career, where you’ll be welcomed as your whole self from day one and supported with generous benefits, we hope you’ll join us.

Klaviyo is committed to a policy of equal opportunity and non-discrimination. We do not discriminate on the basis of race, ethnicity, citizenship, national origin, color, religion or religious creed, age, sex (including pregnancy), gender identity, sexual orientation, physical or mental disability, veteran or active military status, marital status, criminal record, genetics, retaliation, sexual harassment or any other characteristic protected by applicable law.

IMPORTANT NOTICE: Our company takes the security and privacy of job applicants very seriously. We will never ask for payment, bank details, or personal financial information as part of the application process. All our legitimate job postings can be found on our official career site. Please be cautious of job offers that come from non-company email addresses (, instant messaging platforms, or unsolicited calls.

You can find our Job Applicant Privacy Notice here.