Senior Firmware Engineer

EV Charging

ABOUT PLANET3 ENERGY

Planet3 Energy is on a mission to power India's Electric Vehicle (EV) transition with mission-critical, reliable DC fast charging infrastructure built for real-world conditions. Our chargers deliver aviation-grade reliability, rugged performance for Indian environments, and future-ready connectivity to support India's EV transition at scale.

We're a fast-growing deep-tech startup building at the intersection of power electronics, embedded systems, and connected software — with mentorship from experienced engineers across India and Germany. If you're excited about EVs, renewable energy, and smart grid technology, this is a chance to build your career at the ground floor of India's charging infrastructure story.

ROLE OVERVIEW

We are seeking a Firmware Engineer to lead the end-to-end implementation of embedded software for our DC fast-charging controllers. In this role, you will bridge hardware and cloud systems - developing real time control logic, safety-critical routines, and vehicle-to-cloud communication protocols.

KEY RESPONSIBILITIES

- Firmware Lifecycle: Own the full firmware lifecycle - from requirements and design to implementation, modifications, verification, CI/CD release, and field support.
- Core Controller Development: Design / modify and maintain modular, high-reliability embedded code in C/C++ targeting ARM Cortex-M/A microcontrollers (e.g., STM32, NXP i.MX RT).
- Protocol Implementation: Develop and maintain vehicle-to-charger protocols (ISO 15118, IEC 61851, DIN 70121, HomePlug Green PHY PLC) and OCPP backend connectivity.
- State Machines & Safety: Build robust state machines to handle user authentication, metering, thermal monitoring, fault detection, ground fault interlocks (GFCI), and graceful session termination.
- Hardware Integration: Configure low-level peripheral drivers (CAN, SPI, I2C, UART, ADC, GPIO) and interface with power electronics teams to ensure signal integrity and EMI/EMC compliance.




- Connectivity & OTA: Maintain telematics modules (Cellular, Ethernet, Wi-Fi) using secure MQTT/HTTPS/TLS, and build fail-secure, secure Over-The-Air (OTA) update pipelines with automated rollback support.
- Testing & Debugging: Perform board bring-up and debug field issues using oscilloscopes, logic analyzers, JTAG/SWD, and CAN/PLC trace tools.

A NOTE ON REQUIREMENTS We value adaptability, strong core engineering fundamentals, and a passion for learning. If you match most of the core requirements below and are eager to master EV-specific protocols on the job, we strongly encourage you to apply.

CORE REQUIREMENTS (WHAT YOU BRING DAY 1)

- Education: Bachelor's degree in electrical engineering, Computer Science, or a related field.
- Embedded Development: 5+ years of hands-on production experience in C/C++ for microcontrollers (ARM Cortex-M/A).
- RTOS Fundamentals: Solid experience with real-time operating systems (e.g., FreeRTOS, Zephyr, ThreadX systems) for safety-critical hardware.
- Hardware & Lab Skills: Experience reading electrical schematics, board bring-up, and using hardware debugging tools (oscilloscopes, logic analyzers, JTAG/SWD).
- Peripheral Drivers: Proven capability configuring low-level serial interfaces and communication buses (CAN, SPI, I2C, UART, RS-485).

PREFERRED EXPERIENCE (OR WHAT YOU CAN LEARN WITH US)

- Prior experience with EV charging equipment (EVSE), power electronics, or automotive ECUs.
- Hands-on exposure to EV charging communication standards (ISO 15118, IEC 61851, DIN 70121, or OCPP).
- Experience with cellular modem integration (Quectel, SIMCom, u-blox) and telematics (MQTT/HTTPS/TLS).
- Familiarity with embedded cybersecurity practices (Secure Boot, Hardware Security Modules, TPMs).

Level Senior Firmware Engineer (Full-Time)

Location

Coimbatore, Tamil Nadu

Apply to [email protected]

How to Apply: Send your resume to [email protected] with the subject line "Senior Firmware Engineer – EV Charging."

Pay: ₹1,800,000.00 - ₹3,500,000.00 per year

Work Location: In person

📌 Senior Firmware Engineer (Coimbatore)
🏢 Planet3 Energy
📍 Coimbatore