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Lead Software Engineer - Email Platforms

Klaviyo

$188,000 - $282,000
Dec 9, 2025
Boston, MA, US
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Klaviyo is looking to solve the problem of reliable, scalable, and performant email delivery by evolving and owning their email sending pipeline end-to-end, to help the company reach enterprise scale and bring on larger enterprise accounts.

Requirements

  • 8+ years of engineering experience with strong backend and systems design skills
  • Proficient in Go and Python (required)
  • Comfortable coding and reviewing complex systems — this is a hands-on role
  • Experienced working with high-throughput distributed systems
  • Familiar with message queues (e.g., Pulsar, Kafka, RabbitMQ, SQS)
  • Skilled in system design and scaling infrastructure using AWS
  • Bonus: Experience with email infrastructure, MTAs, deliverability, or mailops

Responsibilities

  • Lead a team of engineers building and scaling Klaviyo's email delivery infrastructure
  • Own and drive the architecture of key components in the email pipeline
  • Design and implement scalable, high-throughput services in Go and Python
  • Build systems that manage message queues and ensure reliable email delivery at scale
  • Contribute directly to architecture and code, driving best practices and quality
  • Collaborate cross-functionally to ensure the highest standards of performance, reliability, and deliverability
  • Transform workflows by putting AI at the center, building smarter systems and ways of working from the ground up

Other

  • Clear communicator and collaborative team player
  • Able to thrive in a hybrid team(with some remote team members) and deliver in a high-autonomy environment
  • You've already experimented with AI in work or personal projects, and you're excited to dive in and learn fast
  • Massachusetts Applicants: It is unlawful in Massachusetts to require or administer a lie detector test as a condition of employment or continued employment
  • Klaviyo is committed to a policy of equal opportunity and non-discrimination