Senior Software Engineer, Frontend

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.

We’re looking for thoughtful, experienced frontend product engineers who love designing delightful user interfaces and care deeply about the details. You’ll build the tools that empower our customers to create better experiences for theirs.

You think like a user, not just an engineer. You advocate for clean, intuitive design and love turning complex workflows into seamless, elegant interfaces.

You bring rigor and creativity. Best practices matter - but never more than forward motion.

• →Build high-quality, accessible UIs in React and Ember that power core user workflows
• →Collaborate with engineers and designers to bring new features to life
• →Continuously improve our design system and frontend architecture for performance and scalability
• →Share knowledge and raise the bar through sharing your progress publicly with the team
• →Leverage AI tools to prototype, move faster, and make better decisions

• 7+ years of frontend experience building complex applications
• Fluency in JavaScript, HTML, CSS, and modern frameworks like React (Ember.js is a bonus, or you're open to learning)
• Care for polish, performance, accessibility, and the full user experience
• Strong product thinking, with an understanding of how your code fits into the bigger picture
• A bias for action over perfection, and pride in owning technical decisions

No gotchas, no trick questions - just a clear, human process designed to help both of us make an informed decision.

• Application - We review everyone with care. Tell us why you're interested.
• Recruiter Call (30 mins) - Let’s chat about what you’re looking for and how we work.
• Behavioral Interview (60 mins) - Talk with one of our hiring managers. We’ll explore topics like ownership, product thinking, and collaboration.
• Technical Interview (60 mins) - A conversation focused on your frontend experience.
• Take-Home Assignment - Complete a short, realistic task similar to what you’d work on here.
• Assignment Review Call (60 mins) - Walk us through your work and discuss tradeoffs, priorities, and how you’d iterate.

All final candidates will be asked to complete a background check and employment verifications as part of our pre-employment process.

Customer.io recognizes the stifling impact of systemic injustice on diverse communities. We commit to using our influence to increase inclusion and equity within the tech industry. We strive to build an inclusive team culture, implement bias-free hiring practices, and develop community partnerships to expand our global impact.

Zoom is the only video conference platform that we use, virtual interviews will be conducted using the video capability (i.e., not via the chat), and offers will be extended in writing on official Customer.io letterhead. Please be vigilant in all of your job search activity, and if you have any questions please contact jobs@customer.io.

We believe in empathy, transparency, responsibility, and, yes, a little awkwardness. If you’re excited by what you read and want to build software that makes communication better for everyone—apply now.