(Contractor) Senior Lead Flutter/Dart Mobile Engineer

At Sparq , we help companies solve the right problems—not just build more technology. We’re a modern product engineering partner blending strategy, craftsmanship, and speed to help organizations modernize confidently in the age of AI. From data ecosystems to digital products and AI acceleration, we turn complexity into clarity and ideas into impact. If you’re driven to build what’s next, lead with empathy, and deliver excellence without ego, you’ll feel right at home at Sparq . C2C is not available Must be authorized to work in the U.S. without sponsorship A Day in the Life: Design, develop, and maintain production-grade mobile applications using Flutter and Dart, with a focus on reliability, performance, and offline functionality. Lead the development of a shared offline package that supports local caching, queued operations, background synchronization, and connectivity state management. Integrate shared offline capabilities into Workforce Tools and WFHQ, ensuring consistent functionality and data handling across both applications. Implement local data persistence and background synchronization strategies that allow applications to function reliably during intermittent or extended periods of lost connectivity. Develop offline-first conflict resolution strategies to manage data synchronization, maintain data integrity, and address discrepancies between locally stored and server-side information. Build intuitive data-age indicators and safeguards that prevent users from perfor