Build SDKs and on-device systems for native app messaging and data collection. Own cross-platform development across iOS, Android, and React Native with backend integration.
180k – 320k
RemoteMobile Engineering
About the role
Responsibilities
Build and maintain SDKs, on-device experiences, and backend systems for native app and web delivery
Own projects end-to-end from design through implementation and customer integration
Design APIs and backend services that support cross-channel orchestration, in-app messaging, and behavioral data collection
Evaluate eligibility rules locally on-device against rules pushed from the backend
Collect and batch custom events, screen views, and user attributes on-device for real-time targeting
Ensure SDK developer experience includes clear initialization, sane defaults, useful errors, and comprehensive documentation
Handle versioning and distribution to avoid breaking customer app builds
Requirements
Experience with native development on iOS, Android, or React Native (enthusiasm for working across all platforms)
Experience shipping an SDK or library that other developers integrated into their applications
Experience designing systems spanning server, network, and client layers with careful attention to contracts between components
Comfortable with high ownership in a fast-paced startup environment
Owns development of Kalshi's Flutter-based mobile trading app, building and shipping customer-facing features end-to-end including notifications and biometrics. Requires 5+ years experience with strong Flutter mastery and ownership mindset.
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