Senior Mobile SDK Engineer

Details

Customer.io is a platform used by thousands of companies to send emails, push notifications, in-app messages, and SMS using real-time behavioral data. Under the hood the company uses Go, Swift, Kotlin, TypeScript, Dart and AI to power SDKs and ship scalable products.

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.
• Push SDKs forward by shaping public APIs, adopting new platform capabilities, and ensuring integrations stay current.
• Support external developers by providing thoughtful guidance and resolving technical issues quickly and clearly.
• Write clear, useful documentation from tutorials to reference material 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.
• Comfortable working across mobile platforms and frameworks, with an eye toward developer ergonomics on each.
• Strong API design sensibilities; prioritize clarity, usability, and long-term maintainability.
• Ability to balance the needs of marketers and mobile developers.
• Strong communication skills; helpful, clear, and responsive when working with external developers or unblocking teammates.

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 package: 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
• Recruiter Call (30 mins)
• Behavioral Interview (60 mins)
• Coding Interview (60 mins) — pair with engineers to review and improve a code sample
• Technical Deep Dive (60 mins)
• Background check and employment verifications for final candidates

Values & Culture

• Ownership: end-to-end ownership, move fast, thrive in ambiguity.
• Engineers with product taste: think like a user and care about customer value.
• A healthy disregard for “the way things are done.” Bring rigor and creativity.

Equal Opportunity & Hiring Notes

• Customer.io is committed to inclusion and equity and uses bias-free hiring practices.
• Virtual interviews use Zoom video; offers are extended in writing on official Customer.io letterhead. For questions contact [email protected].

Join us

If you want to build software that makes communication better for everyone, apply now.