X-FLOW is a mobile game development company established in 2018. We gained recognition after the release of Happy Color, the most popular digital coloring book and one of the most successful ad-driven mobile apps in the world. We take pride in our diverse and talented team and partners, spread across the UK, Cyprus, the Netherlands, and other regions worldwide.

We are looking for a proactive Senior SDET with deep expertise in Flutter app testing for our flagship project, Happy Color.

Key Responsibilities:

• Design, scale, and maintain a comprehensive test automation strategy for our Flutter application across all levels: unit, widget, integration, golden/visual regression, and API/contract testing.
• Build and support test automation infrastructure in Dart and Flutter using flutter_test, integration_test, and other relevant tools.
• Architect the test automation project from scratch, establishing engineering standards, design patterns, and best practices.
• Drive effective test coverage, prioritizing critical user journeys, core business logic, application stability, and API reliability.
• Implement code coverage tracking for unit and widget tests, define minimum coverage thresholds, and set up automated quality gates for Merge Requests (MRs).
• Enforce strict quality criteria, ensuring MRs are automatically blocked if coverage drops, required tests fail, or quality standards are violated.
• Integrate test execution into CI/CD pipelines, including unit/widget/golden tests on MRs and integration/E2E test runs on emulators, simulators, and real devices.
• Contribute to mobile app observability: define quality metrics, monitor crash rate, ANR, app launch time, screen performance, and scenario stability; validate logging, analytics events, and error handling; help integrate performance monitoring and crash reporting tools.