Senior Network Engineer/Consultant Cisco ACI & Enterprise Networking

About 3M DATA

3M DATA specializes in building technological foundations for projects across the Middle East. The company provides integrated, future-ready solutions by combining expertise in Next-Gen Cloud Architecture, digital infrastructure, cybersecurity, and managed services. 3M DATA focuses on innovation to enable clients to achieve outcomes in digital technology. The organization supports complex digital initiatives, offering an environment for professionals working on projects that shape the region’s digital future.

Role Overview

As a Senior Network Engineer/Consultant Cisco ACI & Enterprise Networking at 3M DATA in Riyadh, Saudi Arabia, you will manage complex enterprise networking and data center infrastructure. This full-time role involves architecture, administration, security, troubleshooting, migrations, and lifecycle management across traditional enterprise networking and production multi-site Cisco ACI environments. The position requires advanced engineering expertise, technical leadership, and infrastructure security guidance, suitable for a professional with over 10 years of experience who can lead and mentor.

Key Responsibilities

• Administer, configure, and maintain production multi-site Cisco ACI fabrics via the APIC cluster.
• Manage the ACI policy model, including Tenants, Application Profiles, Bridge Domains, EPGs, Contracts, and micro-segmentation.
• Design and implement L4–L7 service graphs for firewall and load balancer integration.
• Design, configure, and troubleshoot L3Out connectivity with enterprise backbones, data center edges, and external routing domains.
• Ensure secure, resilient, and optimized connectivity across data centers and sites.
• Own end-to-end traffic flow design and security across north–south and east–west traffic.
• Implement segmentation and Zero Trust principles using ACI contracts, micro-segmentation, firewalls, and Policy-Based Redirect (PBR).
• Align firewall rules, ACLs, and ACI policies to ensure security and application performance.
• Identify security weaknesses, assess architectural risks, and drive infrastructure hardening.
• Troubleshoot complex traffic flows across ACI, firewalls, load balancers, and enterprise routing environments.
• Continuously monitor Cisco and other vendor security advisories, CVEs, PSIRTs, and emerging threats.
• Proactively assess vulnerabilities and drive remediation through patching, configuration hardening, policy adjustments, and compensating controls.
• Communicate security risks, potential business impact, and recommended remediation actions to stakeholders.
• Provide Tier 3/4 engineering expertise and technical ownership of complex enterprise routing environments.
• Design, configure, and troubleshoot BGP, OSPF, EIGRP, MPLS, VXLAN, and Data Center Interconnect (DCI).
• Manage Cisco Nexus (NX-OS) and Catalyst (IOS/IOS-XE) infrastructure, including VLANs, LAG, vPC, and high-availability architectures.
• Lead network migrations, modernization initiatives, and integration projects across traditional and software-defined networking environments.
• Plan and execute production upgrades and patching across Cisco NX-OS, IOS-XE, and ACI platforms.
• Lead maintenance activities and complex changes while minimizing service disruption and operational risk.
• Own technical change management, network documentation, and root-cause analysis for major incidents.
• Identify opportunities to improve network resilience, performance, security, and operational efficiency.
• Recommend improvements to network architecture, security posture, and infrastructure roadmaps.

Technical Leadership and Mentoring

• Mentor junior and mid-level engineers through hands-on coaching, troubleshooting sessions, and architecture reviews.
• Establish technical standards for configurations, documentation, and change management.
• Act as the senior technical escalation point for complex networking and infrastructure security challenges.
• Build the technical capability and confidence of the wider engineering team.

Qualifications and Experience

• Over 10 years of experience in network engineering and consulting.
• Demonstrated ability to take ownership of complex technical challenges and drive improvements.
• Experience in both traditional enterprise networking and production multi-site Cisco ACI environments.

Work Environment and Commitment

This role operates within a mission-critical networking environment. In addition to standard working hours, the successful candidate must be available for scheduled after-hours maintenance, planned and emergency changes, and critical incident support when required, including evenings, weekends, and public holidays.