Digital Power System Engineer

About Ubiquiti

At Ubiquiti Inc., we create technology platforms for Businesses, Smart Homes, and Internet Service Providers, driven by our goal to connect everyone, everywhere. To date, Ubiquiti has shipped over 100 million devices worldwide, from ISP networking products to next generation of IT solutions. Our growth is made possible by the dedicated team of hundreds behind the scenes. From software developers and product managers to designers and strategists, Team UI is driven to achieve our common goal: Rethinking IT. At Ubiquiti, you’ll heighten your potential and broaden your horizons - all while shaping the future of connectivity.

Responsibilities

• Design and implement digital control loops (voltage, current, PLL, droop, etc.) for the rectifier, inverter, and DC/DC stages of Online UPS systems.
• Develop and tune control algorithms such as PI/PID, state feedback, repetitive control, and feedforward compensation for power conversion topologies.
• Implement high-frequency PWM/SVPWM generation, ADC sampling, and interrupt-driven real-time control on DSP/MCU platforms.
• Develop firmware for full UPS operating modes — online (double-conversion), eco, battery, and bypass — including seamless mode transitions.
• Implement battery charger control (CC/CV charging, charge/discharge management) and coordinate with the BMS for safe battery operation.
• Optimize control performance for transient response, output THD, efficiency, and stability across line and load conditions.
• Design firmware-level protection and fault-handling logic (OV/UV/OC/OTP, short-circuit, inrush, output overload).
• Perform bring-up, debugging, and waveform analysis using oscilloscopes, current probes, and emulators.
• Collaborate with power hardware, magnetics, and system engineers to co-tune control loops with the physical plant.
• Support compliance testing (efficiency, THD, hold-up time, EMI) and resolve firmware-related issues.

Minimum Qualifications

• Bachelor's or Master's degree in Electrical Engineering, Power Electronics, Control Engineering, or a related field.
• 7+ years of firmware development experience focused on digital power conversion.
• Proven track record of shipping Online UPS firmware — hands-on experience with rectifier, inverter, and bypass control is essential.
• Strong hands-on experience implementing digital control loops for switching power converters (PFC, inverter, bidirectional DC/DC, LLC, phase-shift full-bridge, etc.).