Optiver in Sydney seeks a Senior Network Engineer/Architect to lead the design and implementation of LAN/WAN infrastructure across APAC. This role focuses on delivering a reliable, scalable network environment and working across teams to solve complex problems with easy, robust solutions. You will work with Arista and Cisco gear, IaC tooling, Unix systems, and multi-zone firewall architectures, helping to maintain Optiver’s fast, secure trading and non-trading networks.