Full Description

Please note that we are unable to provide visa sponsorship for this position.

About Proper Voltage

Proper Voltage is unlocking the next generation of battery technology across robotics, data centers, and defense.

We're building intelligent battery systems that make advanced chemistries (sodium-ion, lithium-titanate, lithium-silicon) work in products that were never designed for them. Humanoid robots can upgrade power systems without redesigning their entire platform. Data centers get safer, cheaper backup power. Drones and autonomous vehicles get higher energy density without lengthy integration cycles.

If you want to work on hard engineering problems that matter this is the place.

Job Overview

We are looking for a Software Test Engineer who is passionate about building reliable, intuitive software tools that help engineers validate and ship hardware. In this role, you will design and develop the test software—both desktop and web-based applications—used by our test engineering team to verify battery management system (BMS) hardware and firmware. You’ll work at the intersection of software and embedded systems, communicating with BMS modules over a variety of hardware interfaces and translating complex test requirements into clean, usable tools. This is a hands-on individual contributor role within a fast-moving, multi-disciplinary engineering team.

What You’ll Do

Design, develop, and maintain test applications (desktop and web-based) used by test engineers to validate BMS hardware and firmware. Build intuitive user interfaces that enable test engineers to efficiently configure and execute test sequences, monitor real-time data, and review results. Implement communication with embedded systems over UART, SPI, I2C, CAN bus, USB, and Ethernet. Develop automated test sequences for production validation, design verification, and regression testing of BMS modules. Interface with bench instrumentation—programmable power supplies, electronic loads, DAQ hardware, and meters—via SCPI, VISA, or vendor APIs. Build data logging, visualization, and reporting capabilities to support test analysis and traceability. Collaborate with firmware and hardware engineers to define test protocols covering protection algorithms, cell balancing, state-of-charge estimation, and fault detection. Maintain version-controlled repositories with proper documentation, release management, and software quality practices. Support manufacturing and quality teams with test fixture software, calibration utilities, and production tooling. Contribute to safety compliance testing workflows aligned with UL 1973 and UL 9540 requirements. Ability to either work in person at our Carlsbad, CA office or travel there as needed with a demonstrated track record of highly efficient, collaborative remote work.

Required Qualifications

B. S. or M.S. in Computer Science, Computer Engineering, Electrical Engineering, or related field.