Senior Network Engineer

IG Group; Greater London; Hybrid; GBP 90,000 - 130,000; Full time

Benefits offered by this job

Tailored development programs

Mentoring opportunities with leaders

Career progression

Volunteer time off

Job summary

IG Group is seeking a Senior Network Engineer to lead the evolution of our high‑speed, highly available network infrastructure in our London headquarters. You will drive data center enhancements, design and operate containerised and public cloud platforms, and partner with software teams to deliver scalable services.

You will mentor peers and maintain comprehensive network documentation and standards. You will apply advanced routing, switching, and DNS expertise in a fast-paced fintech

Qualifications

• 10+ years in a Senior Network Engineering role, managing medium to large-scale networks.
• Advanced routing and switching knowledge with hands-on leadership.
• Deep TCP/IP understanding across diverse hardware and software.
• Experience with BGP, VXLAN, and vPCs in production environments.

Responsibilities

• Act as the technical lead for data center network enhancements and standardisation.
• Design, implement, and operate containerisation and public cloud platforms.
• Collaborate to design, implement, and manage IG's network to meet availability and performance demands.
• Use automation and DevOps practices to improve network reliability, security and resiliency.
• Partner with development to deliver enhanced services and features for customers.
• Mentor engineers and foster a culture of learning and technical excellence.
• Maintain up-to-date network documentation and diagrams.

Skills

10+ years experience

Routing & Switching

TCP/IP

BGP

VxLAN

vPCs

DNS platforms

Infoblox

Arista Campus

CVaaS

AGNI

DNS security RPZ/DFP

F5 LTM/AFM

Tools

Infoblox

Arista

AGNI

CVaaS

F5 LTM/AFM

Job description

Job Title Senior Network Engineer Job Description About IG Group IG Group is a FTSE 100 fintech operating across five continents, serving over 1.4m customers and handling billions of dollars in transactions – built on scale, trust, and proof. We didn't pivot to innovation; it's how we've always operated. What that means for the people who work here is real: genuinely complex problems to solve, the technology and resources to tackle them properly, and the kind of scope that's rare in established businesses. The bar is high – bring a curious and forward-thinking mindset and we'll give you the platform to define what comes next. Join us at IG – the future gets built here.

As a Senior Network Engineer, you will play a key role in building and enhancing the infrastructure that powers our fast-growing retail brokerage business, while also supporting a variety of other business initiatives. We are passionate about maintaining the speed, stability, and performance of our back-end systems, which directly impacts the experience of our client-facing applications. Our architecture is constantly evolving to meet new technical challenges, but always with a focus on practicality, performance, and scalability. The IG family of companies is committed to empowering individual investors and traders by providing educational media, intuitive and powerful trading software, high-speed order execution, competitive pricing, and innovative financial products. Our engineers have access to a wide range of tools and technologies, offering the opportunity to tackle diverse problems while honing expertise in specific areas. We are looking for self-motivated, engineering-driven professionals who are pragmatic, enjoy working in a fast-paced environment, and take pride in creating and operating large-scale, highly available, high-performance systems. With a lean team and a management philosophy that values autonomy, you’ll have the freedom to shape impactful solutions. In this role, you'll ensure the reliability and efficiency of IG’s network infrastructure by staying ahead of evolving networking technologies, proactively identifying potential issues, and leading multiple tasks and projects. Our goal is to maintain the most stable, performant network possible to deliver the best experience for our customers. This position is based in our London headquarters.

Key Responsibilities:

• Act as the technical lead for the enhancement of our data center facilities, ensuring seamless network integration and standardisation across IG.
• Lead Networks in the design, implementation, and operation of containerisation and public cloud platforms.
• Work collaboratively within the wider network team to design, implement, and manage the groups network infrastructure, ensuring it meets business demands for availability and performance.
• Leverage automation technologies and adopt a DevOps style approach to enhance the efficiency, security, and resiliency of the network environment.
• Partner closely with the development team to deliver enhanced services and features that drive value for our customers.
• Mentor and coach engineers, fostering a culture of learning, growth, and technical excellence within the team.
• Maintain comprehensive and up-to-date network documentation and diagrams, creating new materials where necessary to ensure clarity and consistency.

Skills & Qualifications:

• 10+ years of experience in a Senior Network Engineering role, with demonstrable expertise in managing medium to large-scale network infrastructures.
• Advanced knowledge of routing and switching concepts, with hands-on experience in managing complex network environments.
• In-depth understanding of the TCP/IP stack and experience with a broad range of networking hardware and software, including Switches, Routers, Firewalls, IPS/IDS, and Linux.
• Extensive experience working with protocols such as BGP, VxLAN, and vPCs, with a proven history of managing mission-critical production network infrastructure.
• Strong working knowledge of enterprise DNS platforms (e.g. Infoblox), including DNS architecture, DHCP/IPAM integration, and DNS security (RPZ/DFP).
• Proven hands‑on experience with Arista Campus and Data Centre platforms, including AGNI (network access control/policy) and CVaaS for network telemetry and lifecycle management.
• Familiarity with F5 platforms (LTM/AFM) is advantageous, to support continuity of existing application delivery infrastructure.
• Ability to respond quickly and effectively to high‑pressure incidents, maintaining composure while troubleshooting and resolving issues.
• Demonstrated ownership and commitment to continuously improving network infrastructure, constantly striving to achieve higher levels of reliability, security, and performance.
• Strong experience in collaborating across both technical and business divisions to drive the successful delivery of large-scale enterprise projects.
• Advanced experience designing, building, and maintaining cloud network infrastructure in public cloud environments such as AWS or GCP.

Number of openings 0 Looking for a career at a company that will support you, challenge you and help you grow? IG Group can provide that. IG Group is a FTSE 100 fintech operating across five continents, serving over 1.3m customers and handling billions of dollars in transactions – built on scale, trust, and proof. We didn't pivot to innovation; it's how we've always operated. What that means for the people who work here is real: genuinely complex problems to solve, the technology and resources to tackle them properly, and the kind of scope that's rare in established businesses. The bar is high – bring a curious and forward-thinking mindset and we'll give you the platform to define what comes next. Join us at IG – the future gets built here.

The Perks Your growth fuels our success! Thrive with tailored development programs, mentoring opportunities with leaders, and clear career progression. Expand your network through committees, sports and social clubs. Enjoy extra time off for volunteering and community work. Learn more about the Perks here! Join us for this exciting journey.