Klaviyo · 3 hours ago
Senior Software Engineer - Flows Platform
Boston, MA
Full-time
Onsite
Senior Level
$148K/yr - $222K/yr
6+ years expKlaviyo is a company that empowers creators to own their own destiny by making first-party data accessible and actionable. They are seeking a Senior Software Engineer to join the Flows Platform team, responsible for building and operating the core engine that powers automated lifecycle programs, ensuring reliable and efficient processing of high-scale backend solutions.
AdvertisingAnalyticsE-CommerceMarketing AutomationSoftware
Responsibilities
Help build and operate the core engine that powers all automated lifecycle programs at Klaviyo
Deliver robust, high-scale backend solutions that process billions of events, send millions of messages, and ensure our customers’ automations run reliably and without delay
Tackle complex challenges, explore multiple solutions, and weigh business and technical trade-offs to determine the best path forward
Actively contribute to team discussions and help shape important technology decisions
Ship well-designed, thoroughly tested solutions that prioritize reliability and performance
Ensure that hundreds of millions of actions per day are processed accurately and efficiently to power user workflows
Manage the execution data stores and pipelines that must run reliably at huge scale
Qualification
Required
6+ years of experience in a software engineering role with a focus on backend systems and high-volume data processing
Deep experience building robust services and APIs using Python and Django (or similar frameworks)
Demonstrated experience designing large-scale systems, managing technical debt, and making high-level architectural decisions
Distributed systems knowledge and deep experience working with asynchronous task queues (e.g. Celery, RabbitMQ, Pulsar) and understanding the challenges of eventual consistency and distributed state
Expertise in relational databases (MySQL/Aurora) and high-scale NoSQL stores (Redis or DynamoDB)
A focus on writing clean, maintainable code, participating in code reviews, and leading robust testing practices (unit, integration, and load testing)
A passion for coaching junior engineers, conducting code reviews, and fostering a collaborative and high-performing engineering culture
Experience working in fast-paced environments and collaborating with other engineering teams to solve cross-functional problems
Experience with Infrastructure as Code (Terraform) and container orchestration (Kubernetes)
Experience building cloud-native solutions, ideally on AWS
Experience using AI coding tools like Claude Code or Cursor to accelerate development
Preferred
Experience with Event-Driven Architecture and streaming technologies like Pulsar or Kafka
Background in building platforms that support other engineering teams
Background in digital marketing, customer data software, or building analytics products
Benefits
Participation in the company’s annual cash bonus plan
Variable compensation (OTE) for sales and customer success roles
Equity
Sign-on payments
A comprehensive range of health, welfare, and wellbeing benefits based on eligibility
Company
Klaviyo
Klaviyo is an automation and email platform designed to help grow businesses.
1001-5000 employees
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 CompanyTotal Funding
$1.35BKey Investors
ShopifySands Capital VenturesAccel
2025-08-13Post Ipo Secondary· $195.06M
2025-05-14Post Ipo Secondary· $372.95M
2023-09-20IPO
Leadership Team
Andrew Bialecki
CEO
Ed Hallen
Co-Founder, Chief Strategy Officer, Board Member
Recent News
Investing.com
2026-01-03
2025-12-17
Company data provided by crunchbase