Principal Network Engineer

Principal Network Engineer

The work people build is worth protecting and its harder to protect than it used to be. AI agents now move at machine speed with human-level access and a small slip-up can become a very public one. We disrupt cybercriminal activity before that happens. We think fast go big and always demand more of ourselves. We work hard deliver and repeat. We grow with real determination and put success well within reach. We push each other to be better and expect to be pushed back in a community built on respect where everyone is counted. Work Protected.

Mimecasts Infrastructure & Operations/IT team is looking for a Principal Network Engineer to own the day-to-day operation troubleshooting and continuous improvement of our global corporate network. This role is based in Lexington MA on a hybrid schedule with a minimum of two days per week in the office and reports to the Senior Director IT Infrastructure. Youll work hands-on across Cisco Juniper and Aruba platforms partnering closely with IT Security and Workspace teams to resolve complex issues drive strategic upgrades and use automation to raise operational efficiency worldwide. Youll help deliver the reliable secure high-performance connectivity that keeps every Mimecaster wherever they work seamlessly connected.

• Own the design build and maintenance of network infrastructure across Mimecasts global office locations including edge routing enterprise switching wireless and out-of-band management to support a hybrid workforce.

• Monitor troubleshoot and resolve complex issues across LAN WAN SD-WAN SASE and wireless services ensuring optimal performance and minimal downtime for on-site and remote users.

• Partner with Security 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 seamlessly supports collaboration platforms productivity tools and hybrid work technologies.

• Own 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 driving strategic improvements to performance and scalability.

• Leverage automation and scripting to streamline network operations reduce manual effort and improve configuration consistency across multi-vendor environments.

• Engage with business stakeholders and end users to understand evolving needs and continuously enhance the digital user experience.

• Demonstrated mastery of enterprise network engineering with a track record independently designing implementing and supporting large-scale multi-site network infrastructure with minimal oversight.

• Extensive hands-on expertise with Juniper platforms including Mist EX switches and SRX firewalls spanning configuration troubleshooting and optimization.

• Strong proficiency with Cisco Meraki solutions for cloud-managed switching wireless and security appliances.

• Proven ability deploying and managing Aruba wireless infrastructure across 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 and ZTNA 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 evolving Wi-Fi 6/6E/7 standards.

• Solid command of core network protocols BGP OSPF spanning tree VLANs VPN technologies and QoS.

• Skilled in network automation and scripting (Python Ansible or similar) to streamline operations and ensure configuration consistency.

• Bachelors degree in Computer Science Information Technology or a related field or equivalent practical experience; CCNP CCIE JNCP or similar certifications preferred.

• Exceptional communication interpersonal and cross-functional collaboration skills with a focus on delivering an outstanding user experience.

The base salary range for this position is 144000 - 216000 USD 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.

Belonging at Mimecast

Cybersecurity is a community effort. Thats why were committed to building an inclusive diverse community that celebrates and welcomes everyone unless theyre a cybercriminal of course.

Were proud to be an Equal Opportunity and Affirmative Action Employer and wed 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 wont affect your application.

If you require any adjustments or accommodations due to a disability or any other reason that may help you in your interview process please let us know by emailing

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.