Senior Network Engineer

Mimecast; Greater London; Hybrid; GBP 70,000 - 90,000; Full time

Job summary

A global technology leader based in Greater London is seeking a Senior Network Engineer to enhance its network infrastructure. The role requires hands-on experience with enterprise network solutions including Juniper and Cisco platforms. Responsibilities include troubleshooting complex network issues, collaborating with IT Security teams, and leading technology upgrades. The ideal candidate holds a Bachelor's degree and possesses strong communication skills in a hybrid work environment.

Benefits

Comprehensive benefits package

Formal learning opportunities

Hybrid working model

Qualifications

• 5+ years of experience in enterprise network engineering.
• Extensive hands-on experience with Juniper platforms.
• Proficiency with Cisco Meraki solutions.
• Experience deploying Aruba wireless infrastructure.

Responsibilities

• Design, build and maintain network infrastructure for global operations.
• Monitor and resolve complex network issues to ensure optimal performance.
• Collaborate with Security teams to implement network security policies.
• Lead network upgrade projects and technology refresh initiatives.

Skills

Enterprise network engineering

Juniper platforms

Cisco Meraki

Aruba wireless infrastructure

Opengear management

SASE solutions

Wireless planning expertise

Network protocols

Network automation

Communication skills

Education

Bachelor's degree in Computer Science or related field

Preferred industry certifications (CCNP, CCIE, JNCP)

Tools

Python

Ansible

Job description

Senior Network Engineer

About the Company

Join a passionate and innovative team dedicated to designing implementing and supporting robust network infrastructure across Mimecast's global corporate operations. We're committed to leveraging cutting‑edge networking technologies, automation tools and best practices to deliver reliable, secure and high‑performance connectivity that enables seamless communications, enhances productivity and provides exceptional user experiences for our worldwide family of Mimecasters.

Role Overview

As a Senior Network Engineer you will be responsible for the day‑to‑day operation, troubleshooting and continuous improvement of Mimecast's global corporate network infrastructure. You'll work with diverse networking platforms including Cisco, Juniper and Aruba to maintain optimal performance and availability. Collaborating closely with IT Security and Workspace teams you'll resolve complex network issues, implement strategic upgrades and leverage automation to enhance operational efficiency across Mimecast worldwide operations.

What You’ll Do

• Design, build and maintain network infrastructure across Mimecast's global office locations including edge routing, enterprise switching and wireless systems to support hybrid workforce connectivity.
• Monitor, troubleshoot and resolve complex network issues affecting LAN/WAN/SD‑WAN/SASE and wireless services ensuring optimal performance and minimal downtime for both on‑site and remote users.
• Configure and maintain out‑of‑band management infrastructure to ensure administrative access and recovery capabilities across all network devices globally.
• Collaborate with Security teams to implement and maintain network security policies, access controls and segmentation strategies that protect corporate assets and user data.
• Partner with Workspace and IT teams to ensure network infrastructure supports collaboration platforms, productivity tools and hybrid work technologies seamlessly.
• Develop and maintain comprehensive network documentation including topology diagrams, configuration standards, runbooks and change management procedures.
• Lead network upgrade projects and technology refresh initiatives, evaluating new solutions and implementing strategic improvements to enhance performance and scalability.
• Leverage automation tools and scripting to streamline network operations, reduce manual tasks and improve configuration consistency across multi‑vendor environments.
• Participate in on‑call operations to provide 24/7 network support for critical incidents affecting Mimecast's global workforce.
• Engage with business stakeholders and end users to understand Mimecast's evolving business needs and continuously enhance the digital user experience.

What You’ll Bring

• A wealth of experience with enterprise network engineering and demonstrated expertise in designing, implementing and supporting large‑scale network infrastructure.
• Extensive hands‑on experience with Juniper platforms including Mist, EX switches and SRX firewalls including configuration, troubleshooting and optimization.
• Strong proficiency with Cisco Meraki solutions for network management, including cloud‑managed switching, wireless and security appliances.
• Proven experience deploying and managing Aruba wireless infrastructure in enterprise environments with multiple sites and diverse user populations.
• Working knowledge of Opengear or similar out‑of‑band management platforms for remote device access and network recovery.
• Experience with SASE (Secure Access Service Edge) and ZTNA (Zero Trust Network Access) solutions supporting secure hybrid cloud and remote workforce connectivity.
• Comprehensive enterprise wireless planning expertise including RF site surveys, heat‑mapping, interference analysis, capacity optimization and adapting to evolving wireless spectrum standards (Wi‑Fi 6/6E/7).
• Strong understanding of network protocols including BGP, OSPF, spanning‑tree, VLANs, VPN technologies and QoS implementations.
• Experience with network automation and scripting using tools such as Python, Ansible or similar technologies to streamline operations and ensure consistency.
• Bachelor's degree in Computer Science, Information Technology or related field or equivalent practical experience. Preferred industry certifications such as CCNP, CCIE, JNCP etc.
• Exceptional communication, interpersonal and collaboration skills with a focus on delivering outstanding user experiences.
• Based in the London, UK office, working in a hybrid environment with flexibility for occasional on‑call support and travel requirements.

What We Bring

Join our Network team to accelerate your career journey working with cutting‑edge technologies and contributing to projects that have real customer impact. You will be immersed in a dynamic environment that recognizes and celebrates your achievements.

MIMECAST offers formal and on‑the‑job learning opportunities, maintains a comprehensive benefits package that helps our employees and their family members to sustain a healthy lifestyle and importantly—working in cross‑functional teams to build your knowledge!

Our Hybrid Model

We provide you with the flexibility to live balanced, healthy lives through our hybrid working model that champions both collaborative teamwork and individual flexibility. Employees are expected to come to the office at least two days per week because working together in person:

• Fosters a culture of collaboration, communication, performance and learning.
• Drives innovation and creativity within and between teams.
• Introduces employees to priorities outside of their immediate realm.
• Ensures important interpersonal relationships and connections with one another and our community!

Belonging at Mimecast

Cybersecurity is a community effort. That's why we're committed to building an inclusive, diverse community that celebrates and welcomes everyone unless they're a cybercriminal of course.

We're proud to be an Equal Opportunity and Affiantitive Action Employer and we encourage you to join us whatever your background. We particularly welcome applicants from traditionally underrepresented groups.

We consider everyone equally: your race, age, religion, sexual orientation, gender identity, ability, marital status, nationality or any other protected characteristic won't affect your application.

Due to certain obligations to our customers an offer of employment will be subject to your successful completion of applicable background checks conducted in accordance with local law.

It is unlawful in Massachusetts to require or administer a lie detector test as a condition of employment or continued employment.

Required Experience : Senior IC

Key Skills: EIGRP, Load Balancing, Routing Protocols, Network Engineering, BGP, LAN, Computer Networking, IPsec, OSPF, Cisco ASA, Juniper, MPLS

The base salary range for this position is plus benefits. This range represents the minimum and maximum new hire compensation for this role. The position may also be eligible for incentive plans and additional benefits in accordance with company policy and local regulations. Our salary ranges are determined by role level and location with individual compensation also dependent on factors such as qualifications, experience and skills. Final offers will reflect these considerations and may vary accordingly.