Low Latency Network Engineer

Millennium; Greater London; On-site; GBP 90,000 - 140,000; Full time

Job summary

Millennium’s Information Technology organization supports the firm’s active, multi-manager model with flexible, scalable technology and advanced proprietary systems. The role focuses on engineering low-latency network solutions for trading and market data, balancing project delivery with operational support.

You will own global network projects from requirements gathering to deployment, lead evaluation of new technologies, and collaborate across teams in a fast-paced environment.

Qualifications

• Seven+ years in network engineering in a global environment.
• Hands-on expertise in low-latency networks and routing protocols.
• Experience with Arista/Cisco hardware and high-performance compute.
• Strong time synchronization knowledge (PTP, White Rabbit, PPS).
• Proficient in Python, Bash and Ansible for automation.
• Experience applying AI/ML to network performance and analytics.
• Proficient in Prometheus/Grafana telemetry for monitoring.

Responsibilities

• Engineer low-latency network solutions for trading and market data.
• Own global network projects from design through deployment.
• Evaluate new network technologies and cost analyses.
• Configure and maintain critical network hardware and software.
• Design highly available, low-latency data networks.
• Deploy, monitor, and troubleshoot infrastructure; participate in on-call rotation.
• Maintain infrastructure documentation and policies.

Skills

Low-latency networking

Multicast IGMP

Layer 2/3 design

WAN Design

Arista & Cisco

Time sync tech

Python Bash Ansible

AI/ML for optimization

Telemetry/Observability

Communication skills

Job description

About Millennium

Millennium is a global, diversified alternative investment firm, founded in 1989. Defined by evolution, innovation and focus, Millennium’s mission is to deliver results for our investors.

About Millennium

Millennium is a global, diversified alternative investment firm, founded in 1989. Defined by evolution, innovation and focus, Millennium’s mission is to deliver results for our investors.
Our people are empowered with both independence and support: the autonomy to pursue ideas with conviction and the backing of a global network committed to collaboration, disciplined risk management and continuous learning.
With opportunities to deepen expertise and accelerate development, talent at Millennium is equipped to adapt, evolve and build lasting impact over time. Discover how transformative growth accelerates impact.

Meet the Team

Millennium’s Information Technology organization supports the firm’s active, multi-manager business model through flexible, scalable technology and advanced proprietary systems, including next-generation analytical and trading capabilities. Within Infrastructure, the global network engineering team designs, develops, deploys, and supports high-performance networks for latency-critical trading. Operating across North America, EMEA, and APAC in a follow-the-sun model, the team supports data centers, market data networks, colocation, and proximity colocation sites with demanding availability requirements.

What You'll Do

• Engineer low-latency network solutions for trading, market data, and colocation environments, balancing project delivery with operational support
• Own global network projects from requirements gathering and design through cost analysis, implementation, and deployment
• Lead research and evaluation of new network technologies, including RF, low-latency transport, routing, switching, and compute technologies
• Configure, install, maintain, and support critical network hardware and software
• Research, evaluate costs for, and implement data circuits to meet connectivity requirements
• Design and implement highly available, low-latency market data networks
• Deploy, monitor, and troubleshoot network infrastructure, providing hands-on technical ownership and responsive user support
• Maintain infrastructure documentation, policies, and procedures, and participate in after-hours work and an on-call rotation
  

What You Bring

• At least seven years of experience in network engineering, operations, and support, with demonstrated hands-on technical ownership in a global organization
• Expert knowledge of low-latency networking, including multicast protocols such as IGMP and PIM, Layer 2 and Layer 3 networking, WAN design, BGP, and OSPF
• Experience with Arista and Cisco technologies, including Layer 1 switches; knowledge of FPGA and high-performance computing technologies is a plus
• Strong understanding of time synchronization technologies, including Precision Time Protocol, White Rabbit, and PPS, and their role in low-latency environments
• Expert IP networking and TCP/IP troubleshooting skills, strong Linux shell experience, and proficiency with Python, Bash, and automation tools such as Ansible
• Experience applying AI/ML tools to network performance optimization, anomaly detection, and predictive analytics, with an understanding of frameworks such as TensorFlow, PyTorch, and scikit-learn
• Experience using telemetry and observability frameworks such as Prometheus and Grafana for real-time network monitoring and troubleshooting
• Strong interpersonal and written communication skills, with the ability to deliver responsive, high-quality service to internal customers in a fast-paced environment