Android Developer (Native, USB & Audio) for Proof-of-Concept App

We are looking for an experienced Native Android Developer to build a very small proof-of-concept app that communicates with a custom hardware adapter via USB-C. The PoC scope is intentionally minimal — the app only needs to handle a few control commands and bidirectional audio streaming. About the hardware (important for understanding only)The hardware is a custom USB device based on an STM32 microcontroller. The MCU exposes:- a USB CDC (serial-like) interface for control commands- and a USB-based audio stream (PCM or USB Audio Class)mportant note:We cannot provide external test hardware.All testing with the physical device will be performed on-site by our hardware engineer. You will implement based on documentation and receive quick feedback after each iteration. Project Scope (Proof of Concept)Your tasks- USB Communication- Implement Android USB Host connection- Automatically detect our USB device (VID/PID provided)- Open communication channel (CDC or bulk endpoint)Control CommandsImplement a small protocol to send/receive simple commands, such as:- Trigger TX mode (push-to-talk)- Exit TX mode- Request basic status informationAudio Transfer- Send microphone audio → USB → hardware- Receive audio from USB → play on device speaker- Basic buffer handling (low-latency is not required for PoC)Minimal UI- One large PTT button- Simple connection indicator- status indicator for RX/TXNo design work required — functionality is the only goal.Requirements- Strong experience with Native Android development (Kotlin or Java)Practical experience with:- Android USB Host API- USB CDC or raw USB bulk transfer- AudioRecord / AudioTrack- PCM audio handlingAbility to work with hardware documentation instead of physical accessClean code, clear structure, and excellent communicationNice(st) to Have- Experience with embedded devices or microcontrollers- Experience with USB Audio Class- Understanding of low-level protocolsCollaboration Setup- You will receive complete hardware documentation, USB interface specification, and protocol description.- You develop remotely. - All tests with the physical device are performed by our hardware engineer on our side. - We provide fast feedback cycles and video demos of test results when needed. Apply tot his job