Job Summary

We are looking for an experienced Embedded Firmware Developer to design, develop, test and maintain DLMS/COSEM-compliant firmware for battery-operated ultrasonic smart gas meters. The candidate will be responsible for embedded C development, smart metering protocols, secure communication, valve control, low-power optimisation and certification support.

Key Responsibilities

- Develop and maintain embedded C firmware for ultra-low-power ultrasonic smart gas meters.
- Implement DLMS/COSEM protocols, including OBIS codes, interface classes, DLMS services, HDLC and Wrapper communication.
- Develop metering functionalities such as flow measurement, meter indexing, billing profiles, load profiles, events, alarms and tariff management.
- Implement valve control, tamper detection and security features.
- Integrate communication modules such as NB-IoT, LoRaWAN, RF and MIU.
- Implement DLMS security, including HLS authentication, AES-128-GCM and key management.
- Develop Firmware Over-The-Air (FOTA) functionality using DLMS Image Transfer.
- Optimise firmware for long battery life (10–15 years).
- Perform firmware testing, debugging and hardware integration.
- Support product certification, conformance testing and type approval activities.

Required Technical Skills

- Strong programming experience in Embedded C.
- Hands-on experience with ARM Cortex-M microcontrollers such as STM32, Silicon Labs, NXP, Renesas or MSP430.
- Practical knowledge of DLMS/COSEM and IEC 62056 standards.
- Knowledge of UART, SPI, I2C, ADC, RTC, LCD, Flash and EEPROM.




- Experience with RTOS or Bare-Metal embedded development.
- Familiarity with JTAG/SWD debugging tools and Git version control.
- Understanding of low-power embedded system design and battery optimisation.

Standards & Protocol Knowledge

- DLMS/COSEM – IEC 62056 series.
- DLMS UA Blue Book, Green Book and Yellow Book.
- Gas Metering Standards – EN 14236 and OIML R137.
- Communication Protocols – NB-IoT, LTE-M, LoRaWAN, BLE and IEC 62056-21.
- Security Standards – AES-128-GCM and IEC 62443.
- Safety Standards – ATEX, IECEx and IEC 60079.
- IP Protection – IEC 60529.

Good to Have

- Experience in smart gas metering or ultrasonic gas metering products.
- Knowledge of NB-IoT/LTE-M AT commands and communication module integration.
- Experience with DLMS conformance and certification testing.
- Knowledge of Python-based test automation.
- Familiarity with Guru or related DLMS development tools.

Educational Qualification

- B.E./B.Tech in Electronics & Communication Engineering (ECE), Electrical & Electronics Engineering (EEE), Embedded Systems or a related discipline.
- Relevant hands-on embedded firmware development experience is preferred.

Preferred Candidate Profile

- Strong problem-solving and debugging skills.
- Ability to independently develop and maintain embedded firmware.
- Positive understanding of hardware-software integration.
- Experience working on smart metering or IoT-based embedded products.

Pay: ₹20,000.00 - ₹60,000.00 per year

Benefits:

- Provident Fund

Work Location: In person

📌 Firmware Developer - DLMS/ COSEM ( Smart Gas Metering) (Hyderabad)
🏢 SATRUC APPLIANCES PRIVATE
📍 Hyderabad