About the position
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 careers.klaviyo.com to see how we empower creators to own their own destiny. Why You Should Join the Billing Usage Platform Team: The Billing Usage Platform team sits at the core of our billing and usage infrastructure powering the systems that ensure customers are billed transparently and accurately based on product usage. From tracking millions of real-time events to ensuring billing clarity for both enterprise and self-service customers, our work enables seamless and scalable experiences that support business growth. As a Senior Software Engineer, you'll play a key role in advancing this platform enhancing reliability, scalability, and performance. You'll work alongside a collaborative, high-performing team tackling infrastructure and architecture challenges that span real-time pipelines, reporting, and integrations with key customer and product data. If you're excited about solving complex platform problems with tangible customer impact, this team is for you.
Responsibilities
- Drive critical platform improvement projects that enhance performance and scalability
- Optimize real-time pipelines for accurate usage tracking at scale (e.g., campaign volumes)
- Deliver billing transparency improvements—both platform and customer-facing—through incremental value, fast learning, and unlocks that drive clarity, trust, and reduced friction
- Focused on unlocking impact by using the right tools for the job, leaning into AI, and always looking for opportunities to make a meaningful difference
- Own and evolve key components of an event-driven architecture powering high-reliability systems
Requirements
- Experienced backend engineer with deep expertise in Python and Django—or a fast, adaptable learner who thrives in any stack with the right tools.
- Familiar with frontend development using React and TypeScript (a plus, not required)
- Skilled in working with cloud technologies, particularly AWS
- Experienced in event-driven architecture using tools like Kafka, SQS, or PubSub
- Track record of building and maintaining reliable, large-scale production systems
- Comfortable contributing to platform-level development with customer-facing impact
- Skilled at mentoring teammates and fostering growth across the engineering org
- Comfortable making fast, high-impact decisions and communicating clearly with both the team and stakeholders in dynamic environments
Benefits
- Participation in the company's annual cash bonus plan
- Variable compensation (OTE) for sales and customer success roles
- Equity
- Sign-on payments
- Comprehensive range of health, welfare, and wellbeing benefits based on eligibility
