End-to-End Testing for a Wireless Smart Router

Challenge

The client had no dedicated QA function, leaving developers responsible for testing alongside product development. At the same time, the solution combined six interconnected areas — router hardware, Linux firmware, iOS and Android applications, backend services, and analytics — so defects could originate in one component and surface elsewhere in the ecosystem.

The main challenges included:

• Missing QA infrastructure: Test documentation, defect reporting standards, reusable regression coverage, and established QA workflows had to be created from scratch.
• Hardware-software dependencies: Device behavior depended on reliable communication between hardware, firmware, mobile applications, and backend services.
• Global connectivity: Support for 150+ countries introduced numerous network, carrier, and connectivity conditions.
• Multiple SIM configurations: Physical and virtual SIM workflows required coverage across activation, connectivity, and account scenarios.
• Cross-platform behavior: Core functionality had to remain consistent across iOS, Android, Linux, and different connected devices.
• Multi-user scenarios: The router supported up to 10 simultaneous users, adding connectivity and device-management scenarios.

Solutions

We embedded our QA team into the client’s Scrum process and established a structured testing workflow covering the complete connected-device ecosystem. The team combined product exploration with systematic coverage to identify immediate quality issues while building processes the client could continue using as the product grew.

Key activities included:

• Improved defect management: Standardized reporting and worked directly with developers to prioritize, reproduce, verify, and close issues.
• Established the QA process: Introduced test planning, documentation standards, defect workflows, backlog management, and clear QA ownership.
• Built comprehensive coverage: Created 1,400+ test cases spanning hardware, firmware, mobile apps, backend functionality, and analytics.
• Covered device interactions: Checked communication and state synchronization between the router, Linux firmware, applications, and backend.
• Tested connectivity scenarios: Covered SIM activation, connection loss, reconnection, network changes, and other connectivity conditions.
• Expanded device coverage: Checked 60+ device and OS combinations to identify compatibility and platform-specific issues.
• Checked backend communication: Covered 40+ API endpoints supporting application, device, and backend data exchange.
• Established regression cycles: Created reusable coverage for firmware, application, and backend updates throughout development.

Results

Over 12 months, our QA team transformed developer-led testing into a structured quality process covering the complete router ecosystem. The team identified and documented product issues across hardware and software while establishing reusable QA practices for future releases.

The updated coverage helped stabilize the product across platforms and supported its preparation for the global market.