Lead Firmware Engineer — Powerwall Control

About Arkahub:Arkahub is a full-stack home energy company building consumer-grade energy products designed specifically for Indian households. We believe the Indian home deserves energy solutions engineered for how Indian grids actually behave not adapted from hardware designed for stable European or American infrastructure. Our platform enables households to generate, store, and intelligently manage power through a single system: one that handles the complexity of unreliable grids, volatile tariffs, and rising appliance loads so the homeowner doesnt have to. Over time, this intelligence compounds homes that run on Arkahub can automatically optimise electricity costs as time-of-day pricing expands, protect appliances from the voltage swings that damage modern electronics, and participate in emerging energy networks that turn every connected home into a node in a smarter, cleaner grid. Were building the platform that turns residential energy from a grudge purchase into a product you trust for 25 years. Backed by KAE Capital, Sparrow Capital, and Antler.

What Youll Own

Own the technical direction of all firmware and control algorithms running inside Arkahubs energy products from the inner current loop through to the cloud-connected mode manager, working directly with the founding team

Implement real-time inverter control: current and voltage regulation loops, grid synchronisation, and seamless mode transitions that let the system switch between grid-tied, backup, and standalone operation within a single AC cycle

Build the grid-tracking intelligence that keeps the system locked to Indian grid conditions including the harmonic distortion, frequency variation, and transient events that are routine on Indian feeders

Develop the energy conversion control for the battery interface: bidirectional power flow, soft-switching management, and efficiency optimisation across the full load range

Implement solar maximum power point tracking across multiple input channels

Write the complete Indian grid compliance firmware: voltage and frequency protection windows, reconnection sequencing, anti-islanding, ground fault discrimination, and adaptive load management

Own the safety-critical protection layer: hardware fault detection, battery disconnect supervision, relay health monitoring, thermal derating, secure boot, and over-the-air update infrastructure

Design the firmware architecture for long-term extensibility the same codebase must support product evolution into storage, home energy management, and grid-interactive capabilities

What You Bring

810 years in embedded firmware for power electronics, with 3+ years writing real-time control loops for inverters, motor drives, or energy storage systems

Implemented at least one phase-locked loop for grid synchronisation on a microcontroller

Hands-on experience with STM32 (HRTIM, advanced timers, DMA-driven ADC) or equivalent real-time microcontroller platforms (TI C2000, Infineon XMC)

Written current or voltage regulators at 10kHz update rate with measured stability margins

Experience with safety-critical embedded practices: awareness of MISRA-C, static analysis, structured fault-tree testing

Comfortable with oscilloscope-based control loop debugging: step response, current probes, real-time Bode analysis

Bonus Points

Experience writing firmware for inverters, energy storage systems, or EV chargers deployed on the Indian grid

Familiarity with Indian grid standards (IS 16221, IEC 62116) and anti-islanding implementation

DC-DC converter control experience (phase-shift modulation, ZVS optimisation) and RTOS for mixed-criticality systems