Senior Engineering Manager - Cloud Networking in London

Overview

We operate at scale - billions of transactions, a global hybrid-cloud footprint, and the kind of network challenges that simply don’t exist in smaller environments. If you care about reliability, automation, and making infrastructure disappear so product teams can focus on customers, this is the place.

Why Join Us

This role sits at the intersection of deep technical networking and genuine people leadership. You’ll own the roadmap, shape how we build our hybrid-cloud network, and grow a team that raises the bar for automation and operational excellence. If you believe a reliable, well-engineered network is the foundation that accelerates delivery across an entire organisation, let's talk.

Mimecast is an AI-First engineering organization. Our teams actively leverage AI-powered development tools across all facets of engineering, from code development to testing, documentation, and operations. We're looking for leaders who don't just use AI tools but champion their adoption and establish new ways of working.

Our AI leadership extends beyond how we build to what we build. Our Mihra AI agent delivers 7x faster threat response for customers, and we're recognized as "Agents of Change" in Human Risk Management. Engineers here work at the intersection of cutting-edge AI tooling and AI-powered security products that protect organizations worldwide.

What You’ll Do

• Lead and grow the team. Hire, mentor, and develop a team of cloud network engineers. Foster a culture of ownership, technical rigor, and continuous improvement.
• Own engineering delivery. Plan, prioritise, execute, and communicate progress on cloud networking initiatives to stakeholders across the business.
• Drive the technical roadmap. Shape Mimecast’s hybrid-cloud network architecture through design, deployment, capacity planning, and performance tuning.
• Be the escalation point. Serve as the senior technical escalation for complex network incidents and architectural decisions within the Cloud Networking team.
• Collaborate cross-functionally. Work with Architecture, Security, Platform, and Product Engineering teams to define network requirements and align on organisational objectives.
• Champion automation. Set the standard for infrastructure-as-code practices. Ensure the team builds scalable, intelligent, and repeatable network automation solutions.
• Manage people operations. Hiring, onboarding, performance management, career development, and retention.
• Establish engineering processes. Build and refine operational runbooks, reliability practices, and engineering processes to support a production-first culture.
• Represent the team. Participate in cross-functional leadership forums and contribute to broader engineering strategy.
• Own vendor and budget management. Manage commercial relationships for networking hardware, software, and services - including procurement, licence renewals, vendor performance evaluation, budgeting, forecasting, and cost optimisation.

What You’ll Bring

• Significant experience managing or leading engineering teams operating large-scale production and hybrid-cloud network environments.
• Solid understanding of advanced networking: routing, switching, firewalls, and load balancers at scale.
• Strong technical grounding in AWS networking services in large distributed production environments - Direct Connect, Transit Gateway, VPCs, ALB/NLB, auto-scaling groups, security groups, RAM, IAM.
• Familiarity with infrastructure-as-code tools such as Terraform, with the judgement to set standards for their use across the team.
• Demonstrated ability to hire, develop, and retain strong engineering talent.
• Track record of delivering complex infrastructure projects on time, managing trade-offs between reliability, velocity, and cost.
• Outstanding communication and collaboration skills, with the ability to translate technical complexity for non-technical stakeholders.
• Experience managing engineering budgets and vendor relationships, including procurement, contract negotiation, and cost-benefit analysis for networking infrastructure and tooling.
• Relevant degree or equivalent experience. Networking certifications (JNCIA, CCNA, AWS Advanced Networking) or equivalent depth of knowledge are a plus.

What Sets You Apart

• You have led teams through significant networking transformation projects.
• You combine hands-on technical credibility with a genuine focus on people leadership and team health.
• You are passionate about NetDevOps and stay current with emerging technologies in cloud networking and automation.
• You have a relentless focus on customer outcomes. Every network decision is measured against its impact on performance and the end-user experience. You see the network as an enabler, delivering the platform that engineering teams need to ship product faster.

What We Bring

• A cybersecurity company operating at genuine global scale. Your work protects tens of thousands of organisations and their people.
• A Cloud Platform organisation that values engineering excellence, automation, and doing things properly.
• Competitive compensation as part of a broader total rewards package including equity, benefits, and wellbeing programmes.
• Investment in your development through training and access to cloud and networking technologies.
• A collaborative culture where technical credibility matters.

Career Growth Opportunities

• Shape the future of hybrid-cloud networking at a company investing heavily in its cloud transformation.
• Build deep expertise across private data centre, AWS, and emerging cloud networking technologies.
• Grow into broader engineering leadership roles.
• Develop commercial and vendor management skills alongside your technical leadership.

The Cloud Networking team exists to make the network an enabler, not a bottleneck. The team’s purpose is to deliver a platform so reliable, performant, and well-abstracted that Product and Engineering teams across Mimecast can ship faster and deliver more for customers. Day to day, you’ll split your time between people leadership and technical leadership. You’ll work closely with peer engineering managers in Cloud Platform and with architects and security teams across the organisation. The expectation is hands-on technical credibility combined with a genuine focus on team health and individual growth.

The base salary range for this position is £92,000−£138,000 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.

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 Affirmative Action Employer, and we’d 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.