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WHO WE ARE Optiver is a global market maker founded in Amsterdam, with offices in London, Chicago, Austin, New York, Sydney, Shanghai, Hong Kong, Singapore, Taipei and Mumbai. Established in 1986, today we are a leading liquidity provider, with close to 2,000 employees in offices around the world, united in our commitment to improve the market through competitive pricing, execution and risk management. By providing liquidity on multiple exchanges across the world in various financial instruments we participate in the safeguarding of healthy and efficient markets. We provide liquidity to financial markets using our own capital, at our own risk, trading a wide range of products: listed derivatives, cash equities, ETFs, bonds and foreign currencies. Optiver’s Sydney office is one of the primary players within Asian markets, trading a range of products. Established in 1996, we're an active participant on the Hong Kong, Korea, Singapore, Taiwan and Japan exchanges, and act as Optiver’s APAC head office.  WHAT YOU' LL DO  The Network Operations Engineers are responsible for the network, security infrastructure that underpins Optiver’s trading and business operations across the Asia Pacific region. This includes office networks, data centre environments, and a complex international WAN. We are providing a reliable, fast and well supported network and Unix platform to run our core business on, this requires a good understanding of not only the technical network problem but also the broader business problem being solved. This team is successful when they are collaborating and solving complex problems with simple solutions and are constantly making optimizations in reliability, capacity, scalability and latency. Your responsibilities will include: Support end-to-end infrastructure deployments in Asia Pacific data centers including but not limited to network and security platforms Drive research, innovation, and implementation of infrastructure capacity and reliability optimizations in our Infrastructure environment  Build, manage and support our complex international LAN/WAN & security environment using modern tooling in an IaC (Infrastructure as Code) environment Collaborate with developers, researchers and our hardware engineers on projects that require a stable and scalable platform to operate on Monitor the health and performance of network and infrastructure systems, investigating alerts and proactively identifying operational issues Participate in incident response, working with internal teams and vendors to diagnose and resolve service impacting problems.  WHO YOU ARE 3- 8 years of experience working as a network engineer in an operational environment Experience in managing network systems using Infrastructure as code (IaC) methodology Experience working in a multi zone, multi tier firewall architecture across APAC Solid understanding of network transport and routing protocols such as TCP/ UDP , OSPF , BGP , and Multicast Experience designing, implementing and supporting DC environments. Experience in monitoring and managing diverse international WAN networks.  Strong knowledge of L2/L3 networking, firewalls, and network security. Experience managing infrastructure using Infrastructure as Code approaches and tools such as Git, Terraform, or Ansible. Certifications such as Arista ACE,  PCNSE , CCNP , or CCIE are a plus WHAT YOU'LL GET You’ll join a culture of collaboration and excellence, where you’ll be surrounded by curious thinkers and creative problem solvers. Driven by a passion for continuous improvement, you’ll thrive in a supportive, high-performing environment alongside talented colleagues, working collectively to tackle some of the most complex problems in the financial markets. In return for your expertise, you will be offered a compet