Senior Mobile SDK Engineer

Details

Customer.io builds automation for real-time behavioral messaging used by thousands of companies. You will work on multi-platform SDKs that power email, push notifications, in-app messages, and SMS—helping teams send smarter, more relevant messages.

Responsibilities

• 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.
• Shape public APIs, adopt new platform capabilities, and ensure integrations stay current.
• Support external developers by providing thoughtful guidance and resolving technical issues quickly and clearly.
• Write documentation: tutorials, reference material, and integration guides to make SDKs accessible to teams of all sizes.
• Prototype with AI tools and explore new ways to streamline development and integration.

Requirements

• 7+ years of mobile development experience, with a strong foundation in native iOS.
• Demonstrated experience designing and shipping SDKs used by third-party developers.
• Comfort working across mobile platforms and frameworks, with attention to developer ergonomics on each platform.
• Strong API design sensibilities; prioritize clarity, usability, and long-term maintainability.
• Ability to balance the needs of marketers and mobile developers.
• Helpful, clear, and responsive when working with external developers or unblocking teammates.
• Familiarity with technologies mentioned as part of the stack: Go, Swift, Kotlin, TypeScript, Dart, and AI tools.

What We Value

• Ownership: end-to-end ownership of problems and ability to move fast in ambiguous contexts.
• Product taste: think like a user and care about how systems deliver customer value.
• A healthy disregard for “the way things are done”: rigor and creativity prioritized over inertia.

Compensation & Benefits

• Starting salary: $150,000 - $200,000 USD (or equivalent in local currency), depending on experience and subject to market rate adjustment.
• Inclusive benefits: 100% coverage of medical, dental, vision, mental health, and supplemental insurance premiums for you and your family.
• 16 weeks paid parental leave, unlimited PTO, stipends for remote work and wellness, professional development budget, and more.

Interview Process

• Application review
• Recruiter call (30 mins)
• Behavioral interview (60 mins)
• Coding interview (60 mins) — pair to review and improve a code sample
• Technical deep dive (60 mins) — structured discussion of a project and real-world engineering problems

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

Other Notes

• Role is remote.
• Zoom is the video platform used for virtual interviews (video required).
• Offers will be extended in writing on official Customer.io letterhead.
• Customer.io commits to inclusion and equity, bias-free hiring practices, and community partnerships.

How to Apply

If you’re excited to build software that makes communication better for everyone, apply now or contact [email protected] with questions.