Mobile Test Engineer

SunCore Digital•London, Arizona

100d•$135,000 - $155,000•Remote

About The Position

SunCore Digital is seeking a Mobile QA Engineer to own hands-on testing of Flutter-based mobile applications across supported Android and iOS devices. The role covers mobile functionality, device compatibility, application lifecycle behavior, API integration, synchronization, connectivity, and mobile regression testing. The engineer works under the direction of the Senior QA Engineer / Quality Lead and collaborates with mobile and backend developers, the Web and Backend QA Engineer, UI/UX, and platform engineering. The position owns day-to-day mobile testing and mobile release regression. It includes functional, exploratory, regression, integration, and end-to-end testing; evaluating and implementing appropriate mobile automation; maintaining device and operating-system coverage; validating release candidates; and documenting and escalating defects. The Mobile QA Engineer is not expected to automate every device and workflow and does not solely own backend/API correctness, developer unit and widget tests, all mobile automation, backend performance or security assessment, final release approval, web testing, app-store product decisions, or business requirements. Mobile developers remain responsible for testing their own code, while the Senior QA owns overall quality strategy and release-readiness assessment. Success means critical workflows are consistently tested across supported devices, regression coverage is documented and repeatable, compatibility risks are visible, API and synchronization problems are found before release, network and lifecycle scenarios are tested consistently, defects have enough detail to reproduce, and high-value regression tests are automated where practical. The role is fully remote with asynchronous flexibility. Compensation is competitive and based on experience, portfolio strength, and geographic location. A 10% milestone bonus is awarded to every team member assisting with the MVP build-out, and an annual performance bonus represents a significant percentage of total compensation. Domestic hires receive health, dental, and vision plans. The company also offers an annual paid offsite and describes opportunities to shape QA processes and mentor junior team members.

Requirements

At least three years of professional mobile QA or software-testing experience.
Hands-on experience testing Flutter applications.
Experience testing both Android and iOS applications.
Strong knowledge of mobile functional, exploratory, regression, and integration testing.
Experience testing across multiple devices, operating-system versions, and screen sizes.
Experience testing mobile API integration and data synchronization.
Experience testing under weak or intermittent network conditions.
Experience documenting device-specific and reproducible defects.
Familiarity with mobile logs, debugging tools, and network inspection.
Experience maintaining a mobile device and operating-system coverage matrix.
Strong written communication and documentation skills.
Ability to work closely with mobile and backend engineers.

Nice To Haves

Experience with Flutter integration testing.
Experience with Appium, Patrol, Maestro, or comparable mobile automation tools.
Experience with Firebase Test Lab, BrowserStack, Sauce Labs, or another device-cloud platform.
Familiarity with Android Studio and Xcode diagnostic tools.
Experience testing push notifications, deep links, permissions, background processing, or secure storage.
Experience testing offline or field-use mobile applications.
Experience testing mobile applications involving financial, operational, equipment, or telemetry data.
Familiarity with mobile CI/CD and release pipelines.
Familiarity with app-store release validation.
Experience in a startup or small engineering organization.
Experience testing financial, transactional, or digital-asset mobile applications.
Familiarity with KYC, AML, identity-verification, or other sensitive mobile workflows.
Experience with device-cloud testing platforms or physical-device labs.
Experience testing AI-assisted features, mobile analytics, or behavioral analytics.
Experience working in a remote, asynchronous startup environment.

Responsibilities

Test Flutter applications across supported Android and iOS versions using physical devices, emulators, simulators, and device-cloud services where appropriate.
Perform functional, exploratory, regression, integration, and end-to-end mobile testing of navigation, forms, notifications, permissions, authentication, data display, and user workflows.
Validate behavior across screen sizes, orientations, resolutions, and device capabilities, and identify device- and operating-system-specific defects.
Verify release and debug builds where appropriate.
Test application startup, shutdown, backgrounding, resuming, termination, and behavior after device restart, application update, or reinstall.
Test session expiration and token refresh, and validate deep links, push notifications, operating-system permissions, and device features where applicable.
Check that sensitive information is not exposed through logs, notifications, screenshots, or local storage, and validate battery, memory, and general responsiveness concerns during normal internal use.
Test behavior under strong, weak, intermittent, and unavailable network conditions, including retries, timeouts, duplicate submissions, interrupted workflows, and recovery after connectivity is restored.
Test synchronization with backend services, conflict handling, and prevention of duplicate or inconsistent records; confirm errors are visible and actionable.
Validate mobile API requests and responses, compatibility with API or backend changes, and authentication, authorization, data isolation, and permission behavior from the mobile client.
Work with mobile and backend developers to identify contract mismatches and confirm backend enforcement of client-side restrictions.
Coordinate with the Web and Backend QA Engineer on shared services and data, and verify consistent web and mobile display of shared source data.
Create and maintain the mobile regression suite and a supported-device and operating-system coverage matrix.
Perform release-candidate smoke and regression testing; validate installation, update, configuration, and launch behavior; and test critical workflows before internal distribution or public release.
Record tested devices, operating systems, and application versions; report known compatibility gaps and untested combinations; and support app-store readiness and release validation when required.
Evaluate and implement appropriate Flutter and mobile automation; develop and maintain selected high-value automated tests using Flutter capabilities and tools such as Appium, Patrol, Maestro, or equivalents.
Work with mobile developers on widget, integration, and end-to-end testing; integrate mobile tests into CI/CD where practical and reliable; investigate automation failures and flaky tests; and recommend workflows that should remain manual.
Report mobile defects with device model, operating-system version, application version, network condition, reproduction steps, expected and actual behavior, and screenshots, recordings, or logs where appropriate.
Distinguish application defects from device, operating-system, environment, or backend failures; validate fixes and related regressions; escalate crashes, data loss, permission failures, security concerns, and blocked critical workflows; and monitor recurring defect patterns.
Review mobile requirements and acceptance criteria before implementation, and work with mobile developers to improve testability and diagnostics.
Coordinate with UI/UX on mobile interaction, responsiveness, accessibility, and design consistency, and with platform and DevOps engineers on mobile build and test execution.
Communicate quality status, device coverage, and blockers to the Senior QA.

Benefits

10% milestone bonus awarded to every team member assisting with the MVP build-out.
Annual performance bonus representing a significant percentage of total compensation.
Health, dental, and vision plans for domestic hires.
Annual paid offsite with team retreats in destinations including the Caribbean, Hawaii, and ski destinations.

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