Senior Software Engineer, Full Stack

Hi, I’m Paul, VP of Engineering at Customer.io. We’re looking for curious, driven Fullstack (Product) Engineers who want to own big things and delight our customers. You’ll design, build, and ship the core product experiences our customers rely on - while helping the team push boundaries on what great communication ...

Over 8,000 companies - from scrappy startups to global brands - use our platform to send billions of emails, push notifications, in-app messages, and SMS every day. Customer.io powers automated communication that people actually want to receive.

We help teams send smarter, more relevant messages using real-time behavioral data. Under the hood: Go, React, Ember and AI help us ship fast and scale with confidence.

Build fullstack features in Go, React, and Ember that power key customer workflows
Collaborate with others to turn ideas into shipped customer value
Share knowledge and raise the bar through sharing your progress publicly with short videos, thoughtful writing, and mentorship
Help evolve our systems to scale with more customers, messages, and use cases
Use AI agents to make multi-file changes by scoping the work, writing the prompt, and verifying the output

7+ years of experience building and scaling backend services and product-facing features
Fluency in TypeScript, React (or similar), and a statically typed backend language like Go
A strong care for frontend polish, backend performance, and the overall customer experience
Proficiency with APIs, relational databases, and writing testable, performant code
A bias for action over perfection, and pride in owning technical decisions