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Software Engineer II, New Verticals/Integrations

Klaviyo

$120,000 - $180,000
Sep 30, 2025
Boston, MA, US
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Klaviyo needs to build and maintain integrations to a variety of 3rd party vendors across different industries to enable customers to integrate with these vendors easily. The Integrations team needs to scale these integrations to support Klaviyo's growth into new verticals beyond e-commerce.

Requirements

  • 4+ years of hands-on software development experience creating and maintaining highly available, full-stack SaaS products at scale.
  • A good understanding of the Integrations technical space - 3rd party APIs, authentication, storage, and data pipelines.
  • An in-depth understanding of commonly used web architecture design patterns when it comes to highly scalable systems.
  • You have been a successful interface between the team and the rest of your product area. You have been responsible for owning and delivering projects or features of projects including design, development, and deployment.
  • You have a good understanding of popular AI tools (ChatGPT, Claude Code, Cursor, Gemini, etc.) and know how to use them effectively in your own day-to-day workflow to increase coding and productivity efficiency.
  • Ability to dig into performance and scalability issues to drive breakthrough solutions-- whether it's a slow loading UI or too many clicks in a workflow, a database query timing out, or a queue that just won’t drain.
  • You are proficient in writing technical specifications and documents based on product feature specifications provided by the Product team, and are adept at breaking down and articulating complex technical concepts in a clear and concise manner.

Responsibilities

  • Responsible for building and managing Klaviyo’s integrations, integration settings pages, API services that communicate with 3rd-party vendor APIs, data transformation of data flowing between Klaviyo and the 3rd-party vendors, as well as wiring up the API Services into a number of data pipelines.
  • Helping architect and design robust and high performance data processing and storage systems to serve different internal and external use cases.
  • Build prototypes, establishes design patterns, consults with domain experts and otherwise wors to ensure a team's successful delivery of technical solutions.
  • Contribute to the Klaviyo R&D team as a subject matter expert in multiple areas.
  • Provide quality PR reviews for our code-owned areas of the application.
  • Lead by example and help improve engineering processes and workflows within the Integrations space as well in the wider engineering community.
  • Be responsible for the mission, technical direction and operations of projects that have immediate impact.

Other

  • You are passionate about building software effectively and for the long-term.
  • You possess excellent verbal and written communication skills. Through effective proactive communication and planning, you keep your team up to date on project progress and any blockers or delays.
  • You like to question convention, proactively find ways to innovate, and are intrinsically motivated to drive incremental improvements that deliver value to the business.
  • You like working on small, autonomous agile teams. Enjoy shipping code early and often in an agile fashion, pairing with product management, business stakeholders, and other engineers to craft better software.
  • You enjoy working with new technologies ranging from the frontend to backend, and are particularly passionate and an expert in various tech stacks.