Software Engineer II - Flows Experience
Klaviyo · Boston, MA
About this role
**Software Engineer II – Flows (Onsite, Boston, MA)** **About the role** Flows is how brands automate marketing on Klaviyo—from welcome series and abandoned-cart reminders to complex multi-channel journeys reaching 100M+ consumers. The Flows Experience team builds what marketers use to create flows (canvas, triggers, filters, actions, analytics) and the APIs that developers and AI tools use to build flows. **Mission** Flows should be the easiest, most trusted place to run sophisticated marketing automation—so complex journeys feel simple, mistakes are caught before they cost revenue, and the product keeps up as accounts grow. **What you’ll do (How you’ll make a difference)** - Own major parts of the Flows product (builder, analytics, version history, management surfaces) from design through launch and operation. - Design and evolve public and internal Flows APIs that define how a flow can change (used by customers, partners, and AI agents). - Improve speed and reliability for very large flows and accounts (e.g., canvas render performance, analytics query performance, and APIs under heavy load). - Build guardrails to catch mistakes before they impact revenue (validation, safe defaults, clear feedback, and easy recovery). - Partner with Flows Platform on the contract between product and engine so new capabilities scale from day one. - Raise the bar for the team through technical leadership, design reviews, mentorship, operational excellence, and modern AI-assisted development. **Who you are** - You’ve built and shipped customer-reliant products and care deeply about user experience. - Strong across the stack: you deeply know at least one area (complex front-end apps, API design, or backend performance) and are comfortable across the rest. - Enjoy hard problems at the intersection of UX and systems (e.g., large canvases, workflow friction, timeouts, queues that won’t drain). - Ship early and often, iterate with data and customer feedback, and work closely with product and design. - Thrive on a small, autonomous team where you own outcomes and collaborate widely. - Are curious about how AI changes both what we build (agents that build flows) and how we build it. **Technologies we use (not exhaustive)** - React, TypeScript, JavaScript - Python, Django, Celery - MySQL, Redis, RabbitMQ, Kafka - AWS, Terraform, and modern observability + CI/CD tooling **Travel** - May require up to **10% travel** for onboarding, client/partner work (if applicable), team meetings, and industry events. **Compensation (US locations)** - **Base pay range:** **$116,000 – $174,000 USD** *Note: This role is onsite in Boston, MA, 5 days a week.*
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