Network Security Engineer

and continuously evolve network segmentation, DMZ and other aspects of our network security Evaluate and lab test new platforms for our network security infrastructure Collaborate with our Cybersecurity team on the detection and mitigation of threats and vulnerabilities on our network Interface with application owners and traders to enable business workflows in a secure way Proactively enhance support by improving network infrastructure observability, scripting and communicating requirements to our software engineers Improve our network security processes and documentation A holistic approach to system design is critical for this role. The Networking department prioritises flexibility, compatibility and efficiency when crafting solutions, all while seeking ongoing buy-in and feedback from users across the firm. Our firm's culture prizes intellectual humility, openness and continuous improvement, which translates directly to the daily work of this team. We're all partners working towards

shared goals and are always looking for the next best idea that will make our work stronger. Your strong communication skills and analytical thinking will be invaluable as we support the daily work of our colleagues and keep our systems operating at the highest standard. About You 7+ years of experience operating and deploying network infrastructure Experienced with routing and network protocols (e.g., OSPF, BGP, PIM-SM) Experienced with troubleshooting transport protocols (e.g., TCP/UDP) Have a strong understanding of firewall hardware architecture, including performance metrics and its functional components Experienced with firewall configuration and troubleshooting Understand Public Key Infrastructure and related technologies Understand modern encryption techniques Have a high capacity to learn; we are interested in how you think, not just what you know Able to context switch, while still being able to prioritise and organise your stack Strong communicator with excellent people skills
Flexible and reliable team player who enjoys working in a collaborative environment Proficiency in a programming language is preferred Experience with overlay networks (e.g., EVPN, VxLAN) is a plus Fluency in English is required If you're a recruiting agency and want to partner with us, please reach out to agency-partnerships@janestreet.com.

About the Position We are looking for an experienced Network Engineer to help us run, scale and continuously improve our network security infrastructure through hands-on operations, design and implementation. The ideal candidate will have strong networking fundamentals and experience with security appliances such as firewalls and proxies. Jane Street's numerous distributed systems are built on an agile, reliable multi-vendor network infrastructure that supports all traffic profiles, from trading to internet connectivity. Supporting such a large multi-function network requires advanced tooling for monitoring and automation. You will collaborate with colleagues across the firm globally to find and resolve issues, plan and execute deployments and improve systems where possible. We'll also rely on your advanced networking skills and security knowledge to: Work closely with our Network Engineering team on the design and deployment of security perimeter and adjacent network infrastructure Manage