About the Position

We are looking for an experienced Network Security Engineer who will help us maintain the team’s highest level of service and keep our network security levels ahead of our business demands, while pushing for more standardisation through automation.

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. Enabling those systems to operate in a secure and auditable manner is a key mission of the Network Security team.

Strong communication and interpersonal skills will be needed to collaborate with colleagues across the firm globally. You will find and resolve issues, plan and execute deployments, and improve systems where possible. Additional responsibilities of this role will include:

• Assessing our firewall policies against our security standards and business needs
• Working closely with our Cybersecurity team to mitigate threats and vulnerabilities
• Interacting with stakeholders to establish and push firewall policies
• Troubleshooting issues by analysing packet captures and reviewing audit logs
• Working closely with our Network Engineering team on DMZ designs and deployments
• Contributing to support tasks and actively taking steps to improve the team's ability to monitor our systems effectively, through scripting and/or conveying requirements to our dedicated developers

Getting the details right and keeping good records will be critical in this role. Striving to improve the team through documentation and contributing to our monitoring and automation systems will be a must.

About You

• Hands-on experience with firewall configuration and troubleshooting
• Strong understanding of network security principles and technologies (e.g., TCP, ARP, BGP, OSPF, DHCP, DNS)
• Experience designing a DMZ network
• Motivated to automate workflows to increase efficiency
• Strong ability to context switch and organise your workload
• Clear communication skills and a high degree of customer service
• A flexible and reliable team player who enjoys working in a collaborative environment
• Proficiency in a programming language is preferred
• Fluency in English is required