Embedded System Developer

• Company Description LVJ Soft helps organizations optimize software development and operations by providing practical, technology-driven solutions. The company focuses on leveraging transformative technologies, including IoT and modern software platforms, to support sustainable growth.

LVJ Soft is seeking an Embedded Systems Developer to build a testing and simulation platform for an IoT-enabled product ecosystem. The role involves developing an ESP32-based BLE simulator, creating desktop tools to control test scenarios, and validating end-to-end data flow between devices, mobile applications, and cloud-based SaaS platforms.

Key Responsibilities:

• Develop ESP32 firmware for BLE device simulation
• Implement configurable BLE payloads and test scenarios
• Build cross-platform desktop applications/tools for simulator control
• Integrate with REST APIs for validation and closed-loop verification
• Create tooling to define, send, replay, and vary test data and device states
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• Simulate normal, abnormal, and edge-case device behaviors
• Help define the test architecture, message flow, and validation workflow across (simulator, mobile application, SAAS Backend)
• Troubleshoot BLE communication, timing, and data integrity issues
• Collaborate with engineering teams and document solutions

Required Skills:

• From 3 to 5 years of experience
• Strong experience with ESP32 and Embedded C++
• Hands-on BLE development and debugging experience
• Experience building cross-platform desktop applications using one or more of the following: ( .NET Core / C#/ Python/ C++ )
• Experience working with REST APIs including consuming endpoints and validating responses
• Understanding of device-to-mobile-to-cloud data flows
• Experience building simulators, test harnesses, or hardware/software integration tools
• Strong troubleshooting and problem-solving skills across firmware, desktop, and backend integration layers
• Conversational level of English is a must

Preferred Qualifications:

• IoT device simulation or QA/testing tools experience
• Mobile app and BLE integration experience , especially BLE-to-app communication
• Knowledge of JSON serialization and validation
• Experience with timing-sensitive or stateful device simulation
• Familiarity with SaaS backends, telemetry, and cloud-connected IoT systems
• Experience creating reusable test scenario frameworks or automation tooling
• Experience with logging, diagnostics, and traceability for multi-component test systems