BLE Stack Developer - C/C++ Programming (4-7 yrs)

Roles and Responsibilities :

- Design and develop Bluetooth Classic (BT) and Low Energy (BLE) software for products.

- Implement Bluetooth protocols and profiles.

- Develop and maintain BT/BLE software and firmware.

- Analyze and troubleshoot BT/BLE problems.

- Test and debug Bluetooth software.

- Collaborate with engineers to integrate Bluetooth software with other systems.

- Stay updated on the latest BT/BLE technologies.

- Document Bluetooth software development and processes.

- Work with third-party Bluetooth chipset vendors when required.

Must-Have Skills :

1. BLE 5.0 or 5.4 Expertise :

Strong understanding of BLE 5.4 specifications, particularly :

- Periodic Advertising.

- Enhanced Attribute Protocol (ATT).

- GATT (Generic Attribute Profile) operations.

- Low Power Features and Power Control enhancements.

- Experience in developing custom BLE profiles for ESL applications.

- Understanding of Bluetooth host stack, Modem and Standard Host controller Interface (HCI)

2. Embedded Systems and Firmware :

- Strong C/C++ programming for embedded systems.

- Experience with microcontrollers commonly used in IoT and BLE devices (e.g., Nordic, TI CC26xx/CC13xx, or Silicon Labs).

- Familiarity with BLE SoC SDKs like Nordic SDK, Zephyr, or Silicon Labs Gecko SDK.

- Good understanding of interfaces like UART, SPI, I2C, GPIO, USB etc.

3. IoT Communication Protocols :

- Knowledge of BLE mesh networks and interoperability in multi-device environments.

- Understanding of device pairing, bonding, and secure communication (e.g., LE Secure Connections).

4. Debugging and Testing :

- Familiarity with BLE sniffer tools like Ellisys, WireShark, or Nordic nRF Sniffer for log analysis.

- Experience with automated and manual testing of BLE profiles and applications. Use of tools like GATTBrowser, LightBlue, or nRF Connect for testing.

5.Communication and Protocol Design :

- Designing efficient data exchange protocols between BLE devices and a central gateway or mobile app.

- Experience with encoding/decoding structured data for BLE characteristics.

Good-to-Have :

1. Middleware and Cloud Integration :

- Understanding middleware development for syncing BLE devices with gateways or cloud platforms.

- Experience with MQTT, CoAP, or HTTP/REST APIs.

2. Security :

Implementation of BLE security features :

- Authentication and encryption.

- Resolving key management issues.

- Familiarity with GDPR and data privacy considerations for IoT devices.

3. RTOS Experience :

- Hands-on experience with RTOS (e.g., Zephyr, FreeRTOS) to manage BLEoperations in real-time systems.

4. Power Optimization :

- Techniques for optimizing BLE device power consumption, including sleep modes, low-power advertising, and connection intervals.

5. OTA Updates :

- Knowledge of implementing Over-the-Air (OTA) firmware updates for BLE devices.

6. Documentation :

- Ability to document BLE profiles, communication protocols, and debugging steps for future scalability and maintenance.