Senior Network Engineer

Janestreet; Greater London; On-site; GBP 120,000 - 160,000; Full time

Job summary

Jane Street is seeking a Senior Network Engineer to scale our networks for growing business demands, standardise through automation, and explore AI-driven improvements. You will work on a multi-vendor, highly available network infrastructure across data centres and colocation facilities.

You will collaborate with diverse global teams on design projects, tracking, documentation, and operations while maintaining high reliability and performance standards in Linux environments.

Qualifications

• 7+ years of operating and deploying network infrastructure.
• 3+ years of ground-up network design experience.
• Proficient in Linux and at least one programming language.
• Strong automation mindset and AI/ML-oriented thinking.
• Ability to produce comprehensive, scalable documentation.
• Demonstrated collaboration with diverse global teams.

Responsibilities

• Collaborate on data centre and colocation initiatives, WAN routing optimisation, and cross-team design projects.
• Interface with stakeholders to assess business needs and develop new network features.
• Lead reactive and proactive tasks with thorough documentation to reduce outages and improve troubleshooting.

Skills

Network design

Routing protocols

Linux

Programming

Automation

Documentation

Collaboration

Tools

EVPN

VXLAN

Job description

About the Position

We are looking for a Senior Network Engineer who can help us scale our networks to meet increasing business demands, drive standardisation through automation and look for opportunities to leverage AI to improve operations.

Jane Street’s numerous distributed systems run on a multi-vendor, highly available network infrastructure and handle a variety of traffic profiles – from high-speed trading to everyday internet connectivity. A typical day on the Network Engineering team includes:

• Collaborating on new data centre and colocation initiatives, WAN routing optimisation and other cross-team design projects
• Interfacing with stakeholders to assess business needs and develop innovative network features/capabilities
• Leading both reactive support tasks and proactive infrastructure improvements, focusing on thorough documentation to reduce outages and enhance troubleshooting
• Exploring AI/ML-driven enhancements to streamline operations and continuously improve service quality Using your networking expertise to help us scale our team’s infrastructure at large while maintaining high standards for network performance and reliability
• Documenting solutions and processes that help the team work more efficiently, using a meticulous attention to detail

If you have a passion for innovating within a complex network ecosystem, enjoy building scalable systems and documentation structures and are curious about how AI can refine network operations, this role provides a platform to make a significant impact at Jane Street. We look forward to learning from your expertise and unique perspective.

About You

• Have 7+ years of experience operating and deploying network infrastructure, with 3+ years dedicated to ground-up network design
• Have deep experience with routing and network protocols (OSPF, BGP, PIM-SM) and the troubleshooting of transport protocols (TCP/UDP)
• Comfortable operating in Linux environments and proficient in at least one programming language
• Strongly inclined to automate workflows and explore AI/ML approaches to improve efficiency or reduce overhead
• Eager to produce comprehensive, scalable documentation that benefits the entire team
• Have a demonstrated ability to balance multiple priorities, switch contexts effectively and maintain a high level of customer service
• Excellent collaborator and communicator; ready to build strong partnerships with diverse global teams and stakeholders to share your recommendations, issues and outcomes
• Have a flexible, reliable mindset and enthusiasm for sharing knowledge with peers
• Any prior exposure to overlay networks (EVPN, VXLAN) is a plus
• Fluent in English