Lead Mobile Engineer (React Native / Expo)

SNI • Remote (Poland) • Staff • 8 views • 6 days ago
$100k – $110k per year
Warsaw
TypeScript
C#
JavaScript
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SNI

Connecting top SAP, IT, Data & AI professionals with leading international companies. We help businesses hire the best tech talent.
sniconsulting.net • HQ: Warsaw, Poland • Professional Services • Human Resources • Est. 2005

SNI is serving as a trusted IT Outsourcing partner in line with the needs of World's most prestigious firms and carried out successful projects worldwide.

We are seeking an experienced Lead Mobile Engineer to drive the end-to-end development of a patient-facing mobile application for iOS and Android. This role focuses on building with React Native and Expo while integrating into an enterprise Microsoft/.NET ecosystem.

  • Location/Hours:

    Remote with working hours aligned to US time zones (preference for overlap with Minneapolis / CST).

Responsibilities:

  • Design and deliver cross-platform mobile applications using React Native, Expo (SDK 50+), TypeScript, and Expo Router.

  • Implement OAuth 2.0 / OpenID Connect authentication flows with PKCE, JWT token management, and Microsoft Entra ID (Azure AD).

  • Design and execute secure session propagation between the mobile app and existing web applications integrated via WebViews.

  • Configure and maintain push notification services using Azure Notification Hub, APNs, and Firebase Cloud Messaging (FCM).

  • Manage deep linking, navigation, app lifecycle, and secure local storage (e.g., Expo SecureStore).

  • Set up and maintain automated build and delivery pipelines using EAS Build and EAS Submit.

  • Oversee application publishing, release management, and store deployments via App Store Connect and Google Play Console.

Skills:

  • Extensive commercial experience with React Native, Expo (SDK 50+), and TypeScript across both iOS and Android platforms.

  • Strong expertise in mobile authentication protocols including OAuth 2.0, OpenID Connect, PKCE, JWT, and Microsoft Entra ID (Azure AD).

  • Hands-on experience with React Native WebView integrations, session management, and REST APIs.

  • Practical experience configuring push notifications across Azure Notification Hub, APNs, and FCM.

  • Proficiency with EAS Build, EAS Submit, and publishing to App Store Connect and Google Play Console.

  • Solid understanding of mobile security and secure storage mechanisms (e.g., Expo SecureStore).

  • Strong communication skills with the ability to work independently in a distributed team during US business hours.

Nice to Have:

  • Experience with Azure AD B2C / CIAM solutions and MSAL for mobile.

  • Industry background in healthcare, regulated software, or patient-facing applications.

  • Experience with hybrid architecture combining native apps with WebView-based solutions.

  • Prior experience navigating enterprise authentication and identity management platforms.

Follow us on Linkedin! http://linkedin.com/company/snisourcing

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Warsaw
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$100k – $110k per year