Senior SDK Engineer

Role overview

A senior-level engineering role focused on designing, building, and shipping mobile SDKs that power in-app subscription infrastructure for thousands of apps worldwide. The position emphasizes product-minded craftsmanship, customer empathy, and a developer-first mindset, with the primary focus on either the iOS or Android SDK and occasional contributions to cross-platform or hybrid variants.

Responsibilities

- Design, build, ship, and support end-to-end SDK features that improve customer monetization outcomes - Own development for either the iOS or Android SDK, depending on core expertise - Contribute to additional platform and hybrid SDKs as needs arise - Ship high-quality code through iterative cycles with strong testing practices - Participate in code reviews and contribute to codebase reliability, visibility, and quality - Collaborate effectively across a fully-remote engineering team - Mentor and onboard new engineers, helping shape team culture as the group expands - Scope projects independently and contribute to roadmap and technical direction

Requirements

- 8+ years of professional software engineering experience - Proven track record of shipping mobile apps to the Apple App Store or Google Play Store - Deep expertise in Swift and SwiftUI (iOS) or Java/Kotlin and Compose UI (Android) - Willingness to work across iOS, Android, cross-platform, and hybrid environments - Strong collaboration and communication skills suited to a remote-first culture - Proactive approach to identifying and fixing problems, with the discipline to ask questions when blocked

Nice to have

- Prior experience building SDKs as a product - Familiarity with server-driven user interfaces - Personal apps published to either app store - Backend development experience in Python or similar languages

Benefits and work setup

- Competitive equity in a fast-growing, late-stage startup - Extended window to exercise vested equity options - Fully remote environment built around autonomy and flexibility - 4–5 weeks of flexible time off annually - Paid co-working desk and workspace budget - Continuous learning stipend