Network Security Engineer

Jane Street; Singapore; On-site; SGD 120,000 - 180,000; Full time

Job summary

Jane Street is seeking an experienced Network Engineer to join our Network Security team in Singapore. You will help run, scale, and improve our secure network infrastructure through hands-on operations, design, and implementation, working with firewalls and security appliances.

You’ll collaborate with traders and engineers globally to design perimeter security, enable business workflows securely, and automate observability with scripting and tooling, while continuously improving our security

Qualifications

• 7+ years of experience operating and deploying network infrastructure.
• Experience with routing protocols (OSPF, BGP, PIM-SM).
• Troubleshooting transport protocols (TCP/UDP).
• Strong understanding of firewall hardware architecture and performance metrics.
• Experience with firewall configuration and troubleshooting.
• Understanding of PKI and related technologies.
• Familiarity with modern encryption techniques.

Responsibilities

• Design and deploy security perimeter and adjacent network infrastructure.
• Manage and evolve network segmentation, DMZ, and security controls.
• Evaluate and lab-test new platforms for network security infrastructure.
• Collaborate with Cybersecurity to detect and mitigate threats and vulnerabilities.
• Interface with application owners and traders to enable secure business workflows.
• Improve observability and scripting to empower support and automation.
• Improve network security processes and documentation.

Skills

Networking fundamentals

Firewall & security devices

Routing protocols (OSPF/BGP/PIM-SM)

Troubleshooting TCP/UDP

Public Key Infrastructure

Encryption techniques

Programming knowledge

Tools

Firewall appliances

Network monitoring tooling

Job description

We are looking for an experienced Network Engineer to join our Network Security team 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 proxy.

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.

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. We’ll also look to leverage 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 and continuously evolve network segmentation, DMZ, and other aspects of 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 securely
• Proactively enhance support by improving network infrastructure observability and 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. Our broader Networking team prioritizes 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 toward 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

• Have 7+ years of experience operating and deploying network infrastructure
• Experienced with routing and network protocols (OSPF, BGP, PIM‑SM)
• Experienced with troubleshooting transport protocols (TCP/UDP)
• Have a strong understanding of firewall hardware architecture, performance metrics, and 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 prioritize and organize your stack
• Ideally have experience with overlay networks (EVPN, VxLAN)
• A flexible and reliable team player who enjoys working in a collaborative environment
• Preferably have proficiency in a programming language