Senior Flutter Developer

The current system is a monolithic .NET application coordinated through a single "primary register" per store. Client is re-architecting this into an offline-first, event-driven platform: AWS microservices/Lambda in the cloud, syncing to "dumb" in-store devices (registers, kitchen displays, kiosks) running on Windows, Linux, and Android. Team 1 owns the foundational platform — the shared AWS backend architecture and the on-device framework — that Teams 2 (front-end register flows) and 3 (in-store/hardware integrations) build on top of.

Essential functions

• Architect the Flutter-via-Avalonia UI layer and the .NET business logic layer for Team 1's workstream.
• Implement and extend the local-first data model so terminals can operate independently offline, then reconcile once connectivity is restored.
• Ensure the application performs well on low-cost, client-owned hardware across Windows, Linux, and Android.
• Mentor the pod's Mid-level Mobile/UI engineer(s) and review their code.
• Coordinate with the Pod Lead and AWS Backend Engineer on the sync contract for this workstream.

Qualifications

• 5–8 years of mobile/native application engineering experience.
• Hands-on Flutter experience is required — this is the primary skill we're sourcing against. The client's actual target on-device UI framework is Avalonia (a .NET-native cross-platform UI framework), which they're pairing with Flutter concepts for this build.
• Solid .NET experience for the business-logic layer underneath the UI.
• Experience building software for constrained or embedded hardware (low-cost, client-owned devices).
• Comfort working across Windows, Linux, and Android as target platforms (not iOS — this platform is not in scope).

Would be a plus

Nice to have: prior POS, kiosk, or embedded-device software experience; any direct Avalonia project experience.

We offer

• Opportunity to work on bleeding-edge projects
• Work with a highly motivated and dedicated team
• Competitive salary
• Flexible schedule
• Benefits package - medical insurance, sports
• Corporate social events
• Professional development opportunities
• Well-equipped office

About us

Grid Dynamics (NASDAQ: GDYN) is a leading provider of technology consulting, platform and product engineering, AI, and advanced analytics services. Fusing technical vision with business acumen, we solve the most pressing technical challenges and enable positive business outcomes for enterprise companies undergoing business transformation. A key differentiator for Grid Dynamics is our 8 years of experience and leadership in enterprise AI, supported by profound expertise and ongoing investment in data, analytics, cloud & DevOps, application modernization and customer experience. Founded in 2006, Grid Dynamics is headquartered in Silicon Valley with offices across the Americas, Europe, and India.