A network engineer, also known as a network architect, maintains the connectivity of networks, including data, voice, calls, videos, and wireless network services. They work with a company's computer network, using information technology to develop a network architecture and network systems for everyone in a company to use.
"These information networks can include local area networks (LANs), wide area networks (WANs), intranets, and extranets." Network Engineers ensure all network systems are functioning properly and aim to provide the best possible infrastructure, security, and performance to the end users. Source: Field Engineer