Application Engineer

Rexgear is one of the leading power solutions companies in North America, specializing in test and measurement systems for advanced power electronics. Our portfolio includes:

• Programmable DC power supplies
• AC power sources
• Electronic loads
• Battery cyclers
• Regenerative test systems
• Power analyzers
• Environmental chambers
• Automated test systems



We support innovative companies across industries including renewable energy, battery R&D, EV/EVSE, aerospace, semiconductors, energy storage, and industrial automation.

We are seeking a Applications Engineer to join our engineering team in Irvine, CA.

In this role, you will serve as the technical bridge between Rexgear's products and our customers' applications. You will become an expert in our power test equipment, work directly with customers to solve real-world engineering challenges, and support product integration across complex testing environments.

Responsibilities include hands-on testing, system integration, technical documentation, remote and on-site application support, and close collaboration with engineering, product, and sales teams. You'll engage directly with engineers and researchers developing next-generation power technologies.

• Serve as the primary technical resource for customers evaluating or using Rexgear power test equipment.
• Develop and implement application-specific test solutions for power electronics, battery testing, EV systems, and renewable energy applications.
• Provide pre-sales and post-sales technical support, including system configuration, troubleshooting, and product demonstrations.
• Design and execute bench tests, proof-of-concept evaluations, and system integration setups.
• Create technical documentation, including:
• Application notes
• Integration guides
• Wiring diagrams
• SCPI, Python, and LabVIEW examples
• Collaborate with engineering and product teams to provide customer feedback and drive product improvements.
• Conduct equipment training sessions both remotely and on-site.
• Support automated test system development and hardware/software integration projects.
• Travel up to 10% for customer visits, installations, and training.

• U.S. Citizen or Green Card holder.
• Bachelor's degree in Electrical Engineering or a related discipline.
• Experience or coursework in power electronics.
• 0–3+ years of experience in applications engineering, test engineering, systems engineering, or power electronics (motivated entry-level engineers are encouraged to apply).
• Experience using laboratory equipment such as:
• Oscilloscopes
• DC/AC power supplies
• Electronic loads
• Signal generators
• Similar electronic test equipment

• Strong understanding of power electronics fundamentals:
• DC/DC converters
• AC/DC converters
• Inverters
• Batteries
• Control systems
• Ability to read and create electrical schematics, wiring diagrams, and test setups.
• Hands-on experience with test automation or remote instrument control using:
• Python
• LabVIEW
• SCPI commands
• Experience with industrial communication protocols (CAN, Modbus RTU/TCP, EtherCAT)
• Prior customer-facing technical support or field service experience
• Excellent analytical and troubleshooting skills in customer-facing environments.
• Ability to quickly learn new technical concepts in a fast-paced environment.
• Strong written and verbal technical communication skills.
• Comfortable working independently and within a collaborative engineering team.
• Self-motivated with a strong desire to learn advanced power test systems and applications.



• Work with cutting-edge power test systems used by leading technology companies.
• Gain hands-on experience in:
• Renewable energy
• Electric vehicles
• Aerospace
• High-power electronics
• Join a fast-growing engineering team with excellent opportunities for career development.
• Competitive salary based on experience, education, and skills.