Software Engineer II - API jobs in United States
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Klaviyo · 2 days ago

Software Engineer II - API

positionBoston, MA
timeFull-time
remoteOnsite
seniorityMid, Senior Level
money$120K/yr - $180K/yr
date3+ years exp

Klaviyo is a company that empowers creators to own their destiny by making first-party data accessible and actionable. They are seeking a Software Engineer II to contribute to the evolution of Klaviyo's public and internal API platforms, collaborating with product owners and engineering peers to deliver high-quality, scalable solutions.

AdvertisingAnalyticsE-CommerceMarketing AutomationSoftware
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Comp. & Benefits
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H1B Sponsor Likelynote

Responsibilities

Contribute to the evolution of Klaviyo's public and internal API platforms
Participate in code reviews, product specifications, and scope definition
Collaborate with product owners and engineering peers to deliver high-quality, scalable solutions
Influence the direction and priorities of the API team

Qualification

PythonAPI DevelopmentMicroservices ArchitectureCI/CD PipelinesPerformance OptimizationDjango REST FrameworkMySQLRedisGoJSON API

Required

3–5+ years of experience in software engineering
Experience working with both monolithic and microservices architectures
Experience with CI/CD pipelines
Strong debugging and performance optimization skills

Preferred

Experience with metaprogramming
Experience with Go
Familiarity with JSON:API
Experience designing and building internal or public APIs
Experience with Service-Oriented Architecture (preferably in Python)
Experience working with RESTful applications, APIs, or gRPC

Benefits

Generous benefits

Company

Klaviyo

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Klaviyo is an automation and email platform designed to help grow businesses.
dateFounded in 2012
location
Boston, Massachusetts, USA
people-size1001-5000 employees
web-link
http://www.klaviyo.com

H1B Sponsorship

Klaviyo has a track record of offering H1B sponsorships. Please note that this does not guarantee sponsorship for this specific role. Below presents additional info for your reference. (Data Powered by US Department of Labor)
Distribution of Different Job Fields Receiving Sponsorship
Represents job field similar to this job
Trends of Total Sponsorships
2025 (47)
2024 (29)
2023 (24)
2022 (27)
2021 (21)
2020 (8)

Funding

Current Stage
Public Company
Total Funding
$1.35B
Key Investors
ShopifySands Capital VenturesAccel
2025-08-13Post Ipo Secondary· $195.06M
2025-05-14Post Ipo Secondary· $372.95M
2023-09-20IPO

Leadership Team

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Andrew Bialecki
CEO
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Ed Hallen
Co-Founder, Chief Strategy Officer, Board Member
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Recent News

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BTIG Reveals its Best Stock Picks for H1 2026
2026-01-03
Boston Globe
Training a robot to replace you? Local startup Tutor Intelligence says it could happen.
2025-12-17
Boston Globe
Boston firm Klaviyo enters new growth stage as Andrew Bialecki brings on co-CEO
2025-12-16
Company data provided by crunchbase