Senior Mobile SDK Engineer

Over 7,500 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, Swift, Kotlin, TypeScript, Dart and AI power our SDKs and help us ship fast and scale with confidence.

What We Value

Ownership

You own problems end to end. You move fast, act like an owner, and thrive in ambiguity. You've led complex projects before—whether officially or not—and you're ready to do it again.

Engineers with product taste

You think like a user, not just an engineer. You care how your systems power real customer value—and how to make them better.

A healthy disregard for “the way things are done.”

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

What You'll Do

• Design and build multi-platform SDKs that are stable, performant, and easy to integrate.
• Drive architecture, testing, and release workflows. Guide technical strategy and make long-term bets.
• Push our SDKs forward. Shape public APIs, adopt new platform capabilities, and ensure integrations stay current.
• Support external developers by providing thoughtful guidance and helping resolve technical issues quickly and clearly.
• Write great documentation. From tutorials to reference material, you’ll help make our SDKs accessible to teams of all sizes.
• Prototype with AI tools and explore new ways to streamline development and integration.

What We're Looking For

We believe in transparency. Starting salary for this role is $150,000 - $200,000 USD (or equivalent in local currency) depending on experience and subject to market rate adjustment.

We know our people are what make us great, and we’re committed to taking great care of them. Our inclusive benefits package supports your well-being and growth, including 100% coverage of medical, dental, vision, mental health, and supplemental insurance premiums for you and your family. We also offer 16 weeks paid parental leave, unlimited PTO, stipends for remote work and wellness, a professional development budget, and more.

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

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.

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.

We are an equal opportunity employer and welcome applicants from diverse backgrounds.

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