Berriz will report to David Stewart, the company's chief executive and managing director.
The appointment comes as NetComm restructures its engineering activities into product development execution and future technologies.
The former will encompass activities that deliver products to customers and the latter will cover activities that identify, review, evaluate, design and introduce future technologies.
Chief technology officer Steve Collins will be in charge of future technologies and position the company as a global communications technology leader.
Berriz has been in product management for 32 years, including design engineering, product development and high-volume mass production design. He will start work in Florida before relocating to Sydney in early January 2017.
Before joining NetComm Wireless earlier this year as director of engineering in Florida, Berriz held senior engineering execution roles in the US with Research in Motion (Blackberry) for nine years, Freescale Semiconductor for eight years and Motorola for more than 15 years.
Stewart said: "NetComm Wireless made the strategic decision to target growth opportunities and build new revenue with a focus on the expansion of R&D resources. With the rapid growth of our engineering team it has become necessary to further invest in the strategic direction of our technology. Sergio brings a wealth of leadership experience at scale and deep technical understanding that complements our existing engineering capabilities.
"We are confident that our new engineering structure will optimise efficiency and performance and strategically position NetComm Wireless at the forefront of global communications solutions."
Berriz said: "Having spent over 30 years in the telecommunications industry with companies at the forefront of innovation, I was thrilled to join NetComm Wireless earlier this year. The company is at the forefront of engineering led innovation within the global telecommunications industry. In my new role, I look forward to working with a highly talented team of hardware, software and RF engineers committed to developing real world solutions for customers across FTTdp, fixed wireless and wireless M2M."