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Senior Software Engineer - Billing Usage Platform

KlaviyoBoston, MA

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Job Description

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.

How You Will Make a Difference:

  • 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

Who You Are:

  • 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

Technologies We Use:

  • Languages & Frameworks: Python, Django, React, TypeScript
  • Infrastructure: AWS (S3, Athena), Redis, MySQL
  • Architecture & Messaging: Kafka, SQS, REST/HTTP, gRPC

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

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Submit 10x as many applications with less effort than one manual application.

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