Firmware Engineer - Audio

We are seeking a highly experienced Firmware Engineer with 8+ years of hands-on experience in embedded audio software development, including Bluetooth audio, low-power design, and

audio signal processing. This is a critical role in our hardware-software co-development team,

where your expertise will directly impact the performance and user experience of our AR/VR smart glasses and immersive systems.

In this role, you will work on Bluetooth audio protocols, embedded DSP optimization, noise

cancellation algorithms, and real-time streaming pipelines, while collaborating closely with

hardware, product, and design teams. Your work will drive the core embedded intelligence of

AjnaLens' next-generation devices.

Top 3 Daily Tasks

● Develop and optimize embedded audio firmware using C/C++, ensuring efficient

performance, low power consumption, and real-time audio processing.

● Work on Bluetooth audio protocols (A2DP, AVRCP, HFP), BLE profiles (HAP, TMAP,

HAS, PBP), and audio codec integration (SBC, AAC, aptX, LC3).

● Collaborate with hardware and systems teams to integrate microphones, speakers,

amplifiers, and other peripherals via interfaces such as I2S, UART, and SPI.

Full-Stack Awareness

While your primary focus will be firmware and embedded systems, awareness of system-level

software integration, cloud/BLE connectivity, and app-level coordination will be a plus in

delivering robust end-to-end solutions.

Must Have:

● Strong command of Embedded C/C++, including memory management, real-time

programming, and hardware abstraction.

● Deep understanding of Bluetooth architecture, audio profiles (A2DP, AVRCP, HFP), BLE

features (HAP, TMAP, HAS), and advanced Bluetooth technologies like Angle of Arrival

(AoA) and Angle of Departure (AoD).

● Hands-on experience with audio codecs: SBC, AAC, aptX, and LC3.

● Familiarity with noise reduction techniques such as ENC (Environmental Noise

Cancellation) and ANC (Active Noise Cancellation).

● Proficiency with tools and methods for debugging, testing, and performance optimization

of embedded systems.

Nice To Have:

● Working with embedded Linux or RTOS-based environments.

● Integrating Bluetooth stacks from Nordic (nRF52), Qualcomm (CSR), or Broadcom

chipsets.

● Handling audio streaming, buffer management, latency reduction, and audio quality

assurance.

● Bluetooth sniffing and traffic analysis using tools like Ellisys, Frontline, or similar.

● Audio quality testing: Evaluating latency, jitter, and fidelity across Bluetooth audio profiles.

● Power optimization and low-power system design for wearable/portable applications.

● Working in Agile teams, using Git, CI/CD, and writing clear technical documentation and

• test automation scripts.