Lead Software Engineer - Billing

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.

The Billing team at Klaviyo is at the heart of how we deliver value to our customers and drive revenue for the business. We’re responsible for everything from pricing and payments to product entitlements. Our systems ensure customers are billed accurately and have access to the features they’ve selected. As Klaviyo expands globally and launches new product offerings, our team plays a pivotal role in enabling speed, flexibility, and scale across the company.

As an Lead Software Engineer on this team, you’ll lead a group of engineers focused on building internal platforms that empower teams across Klaviyo to self‑serve product packaging, entitlements, and billing logic. You’ll oversee work to build a pricing and packaging platform, and to build scalable infrastructure that supports international growth. This is a hands‑on leadership role where you’ll contribute to code, design, and strategy.

Your work will directly enable faster product launches, better customer experiences, and improved business outcomes.

• Lead a team of engineers building a new internal pricing and billing platform
• Own Klaviyo’s 3rd party payment and billing integrations and expand payment capabilities
• Build scalable systems to support international markets and payment flexibility
• Contribute directly to architecture and code, driving best practices and quality
• Collaborate with cross‑functional teams to unlock product revenue opportunities
• Grow and mentor engineers while helping shape the future of billing at Klaviyo
• Transform workflows by putting AI at the center, building smarter systems and ways of working from the ground up.

• 8+ years of engineering experience with strong backend skills (Python or similar)
• Comfortable coding and reviewing complex systems — this is a hands‑on role
• Experience with fullstack development (React familiarity is a plus)
• Proven experience with third‑party APIs, especially Stripe or payment systems
• Skilled in system design and scaling infrastructure using AWS
• Experience building developer platforms or internal tooling is a strong plus
• Clear communicator and collaborative team player
• You’ve already experimented with AI in work or personal projects, and you’re excited to dive in and learn fast. You’re hungry to responsibly explore new AI tools and workflows, finding ways to make your work smarter and more efficient.

• Python, Django
• React, Type Script
• Stripe API, RESTful integrations
• AWS, Terraform, Redis, MySQL

This is a hybrid role based in Boston
, with 3 days in office and 2 days remote per week.

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

Massachusetts Applicants: It is unlawful in Massachusetts to require or administer a lie detector test as a condition of employment or continued employment. An employer who violates this law shall be subject to criminal penalties and civil liability.

Our salary range reflects the cost of labor across various U.S. geographic markets. The range displayed below reflects the minimum and maximum target salaries for the position across all our US locations. The base salary offered for this position is determined by several factors, including the applicant’s job‑related skills, relevant experience, education or training, and work location.

In addition to…