Senior Network Engineer

Job Title: Senior Network Engineer Location: Houston, TX (Hybrid, 4:1) Reports To: Network Manager - AMER Employment Type: Full Time About Us Help us insure it. Tokio Marine HCC is a leading global specialty insurance group, backed by the strength and stability of the Tokio Marine Group. With more than 50 years of sustained growth and profitability, and offices across the United States, the United Kingdom, Europe, and other international locations, we offer more than 100 classes of specialty insurance-covering everything from the crops that feed us and the concerts that entertain us to rescuing travelers abroad. Guided by our Mind Over Risk philosophy, we empower clients to pursue opportunities with confidence while fostering a culture rooted in innovation, collaboration, and trust. Always Advancing, we embrace an entrepreneurial spirit; as Experts in Tomorrow, we anticipate what's next; and by Reaching Out, we build genuine connections that enable our people and our business to thrive. Role Overview The Senior Network Engineer (AMER) is a senior hands-on engineering role responsible for the design, build, deployment, and effective operation of network infrastructure and network security services across the AMERICAS region. The position will serve as a subject matter expert (SME) for Cisco Application Centric Infrastructure (ACI) and enterprise routing and switching, while providing strong engineering capability for Palo Alto Networks next-generation firewalls (NGFW). The engineer will own complex technical delivery and troubleshooting across data center, campus, WAN, Internet, cloud connectivity, and network security environments. The role also leads complex incidents, produces designs and implementation plans, collaborates across regional and global teams, mentors other engineers, and serves as an escalation point for complex network and network security issues. Success is measured through service availability and stability, incident resolution effectiveness, change quality, compliance with standards and controls, delivery against requirements and timeframes, and documentation and mentoring effectiveness. Key Responsibilities

• Serve as the AMER technical SME for Cisco ACI, including fabric architecture, APIC operations, tenants, VRFs, bridge domains, EPGs, contracts, L3Outs, external connectivity, fabric upgrades, troubleshooting, and operational lifecycle management.
• Provide advanced engineering and escalation support for Cisco routing and switching across data center, campus, branch, and WAN environments, including IOS/IOS-XE/NX-OS platforms and BGP/OSPF routing.
• Engineer, configure, troubleshoot, and support Palo Alto Networks NGFW platforms, including security and NAT policy, zones, routing, high availability, Panorama-managed environments, upgrades, logging, and operational troubleshooting.
• Design and implement complex, standards-aligned network and network security changes with clear implementation, validation, and rollback plans.
• Lead troubleshooting and resolution of high-severity incidents and complex performance or connectivity problems within SLA, acting as a senior escalation point for other engineers and support teams.
• Proactively monitor and maintain the network, delivering network as a service to TMHCC business units.
• Champion and adhere to global architecture, engineering standards, processes, security controls, and change governance.
• Produce and maintain detailed technical documentation, including high-level and low-level designs, diagrams, standards, operational procedures, implementation plans, and asset records.
• Participate actively in network engineering design, project review, and governance forums; provide technical input and challenge where appropriate.
• Work closely with global Network Services, Security, Infrastructure, Cloud, and application teams to deliver resilient end-to-end solutions.
• Contribute to network automation, standardization, observability, lifecycle management, and continuous operational improvement.
• Provide technical leadership, coaching, knowledge transfer, and mentoring to network engineers and operational support resources.

What You Bring Education

• Required: Cisco CCNP Enterprise or CCNP Data Center certification, or equivalent demonstrable expert-level experience.
• Required: Palo Alto Networks certification (PCNSE or current equivalent) or equivalent demonstrable hands-on NGFW expertise.
• Strongly preferred: Cisco CCNP Data Center and/or Cisco ACI-focused certification or equivalent production experience.
• Preferred: Cisco CCIE (Enterprise Infrastructure or Data Center).
• Preferred: ITIL Foundation or higher.

Experience

• 8-10 years' experience of internetworking within a global enterprise organization (3000+ users).
• Deep hands-on experience with Cisco ACI, including designing, deploying, operating, upgrading, and troubleshooting production ACI fabrics.
• Expert-level enterprise and data center Cisco routing and switching experience using IOS/IOS-XE and NX-OS, including Catalyst, ASR/ISR, and Nexus platforms.
• Advanced BGP and OSPF design and troubleshooting experience, including route policy, redistribution, path selection, convergence, and failure analysis.
• Strong hands-on Palo Alto Networks NGFW engineering and troubleshooting experience.
• Strong understanding of Layer 2/Layer 3 design, VLAN/VXLAN concepts, redundancy, high availability, segmentation, and resilient data center connectivity.
• Practical experience with DIA, broadband, AWS Direct Connect, Azure ExpressRoute, and other WAN connectivity services.
• Relevant hands-on network support experience in a pressurized environment, ideally within Financial Services or Insurance.

Key Competencies

• Ability to isolate complex application, network, routing, switching, ACI fabric, and firewall issues using packet captures, logs, telemetry, and network diagnostic tools.
• Effective communication skills with the ability to influence and coach network engineers and function effectively in a federated environment with global colleagues and team members at all levels.
• High level of organizational and analytical skills with the demonstrated ability to plan and manage multiple tasks simultaneously.
• Ability to work independently and provide regular updates on work and priorities to management.
• Familiarity with testing tools, networking technologies, and techniques used to troubleshoot and resolve complex technical problems associated with services, applications, and network hardware and software.
• Sound technical judgment and ability to deliver operational and project work reliably and securely with appropriate risk controls.

Travel (if required/needed) As required. What We Offer

• Competitive salary and comprehensive medical, vision, and dental benefit package, with eligibility beginning on your date of hire
• Strong learning culture with ongoing development opportunities
• Basic life and disability insurance
• 401(k) plan with 6% company match
• 20 days of PTO, two floating holidays, approximately 11 paid holidays, and volunteer time off
• Paid parental leave
• An opportunity to do meaningful work and love what you do

Equal Opportunity Employer TMHCC is an equal opportunity employer. All qualified applicants will receive consideration for employment without regard to age, ancestry, citizenship, color, family or medical care leave, gender identity, genetic information, marital status, medical condition, national origin, physical or mental disability, protected veteran or military status, race, ethnicity, religion, sex (including pregnancy), sexual orientation, or any other characteristic protected by applicable local laws, regulations, and ordinances. #LI-SD1 Tokio Marine HCC