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Senior Software Engineer - New Product

Klaviyo

$152,000 - $228,000
Dec 9, 2025
Boston, MA, US
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Klaviyo is looking for a Senior Full Stack Engineer to lead key initiatives that will enhance product offerings and support company growth by developing innovative end-to-end solutions using both front-end and back-end technologies.

Requirements

  • 7+ years of experience in a software engineering role
  • Strong experience developing end-to-end software solutions or extensive experience with both front-end and back-end technologies
  • Experience with Python and related technologies
  • Experience with React and related technologies
  • Experience developing digital marketing or customer data software solutions
  • Experience with machine learning
  • Experience building cloud-native solutions, ideally with AWS

Responsibilities

  • Developing innovative end-to-end solutions using both front-end and back-end technologies
  • Optimizing existing products and creating new solutions that redefine what’s possible for customers
  • Tackling complex challenges, developing multiple solutions, and evaluating business and technical trade-offs
  • Deploying well-designed, thoroughly tested solutions that ensure reliability and performance
  • Leading projects and being accountable for their outcomes
  • Mentoring team members or driving initiatives that help the team learn new skills
  • Conducting code reviews and running a robust testing cycle

Other

  • 7+ years of experience in a software engineering role
  • Bachelor's degree or equivalent experience
  • Ability to work in agile, fast-paced environments
  • Strong communication and collaboration skills
  • Ability to take radical ownership and roll up sleeves to make things happen