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 Saa S 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
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 Saa S 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