Klaviyo · 1 hour ago
Software Engineer II - Flows Platform
Boston, MA
Full-time
Onsite
Mid Level
$116K/yr - $174K/yr
3+ years expKlaviyo 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 join the Flows Platform team, where the role involves building and operating the core engine that powers automated lifecycle programs, ensuring reliable and efficient processing of events and messages at scale.
AdvertisingAnalyticsE-CommerceMarketing AutomationSoftware
Responsibilities
Core Execution Engine: The logic for flow triggering, evaluation (filtering/branching), and action execution. We ensure that every event is processed accurately and efficiently
Scheduling & Orchestration: Managing time-based logic, delays, and the dispatching of millions of scheduled actions per day
High-Scale Infrastructure: Owning the execution data stores and pipelines that must run reliably at huge scale
Qualification
Required
3+ years of experience in a software engineering role with a focus on backend systems and high-volume data processing
Strong Backend proficiency: Deep experience building robust services and APIs using Python and Django (or similar frameworks)
Distributed Systems knowledge and experience working with asynchronous task queues (e.g. Celery, RabbitMQ, Pulsar) and understanding the challenges of eventual consistency and distributed state
Proficiency with 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)
Experience working in fast-paced environments and collaborating with other engineering teams to solve cross-functional problems
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
Experience with Infrastructure as Code (Terraform) and container orchestration (Kubernetes)
Experience creating technical designs for complex features or system migrations
Background in building platforms that support other engineering teams
Experience building cloud-native solutions, ideally on AWS
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