Network Engineer LAN​/WLAN - Cisco Enterprise

paid holidays, long term disability, tuition reimbursement, flex time, 401(k)

United States, Massachusetts, Waltham

Feb 24, 2026

We're seeking a Network Engineer with deep expertise in Cisco enterprise LAN and WLAN technologies to support a distributed campus and branch network environment. This role demands a balance of architectural thinking and hands‑on execution - someone who can design with foresight, configure with precision, and troubleshoot under pressure. You'll be responsible for maintaining and evolving a multi‑site Cisco network built on high‑availability, security, and scalability principles.

The right engineer has seen networks break, learned from it, and knows how to build them better.

• Design, implement, and support Cisco LAN/WLAN infrastructure across campus and branch offices - including Catalyst switching, ISR/ASR routing, and Catalyst/Aironet/Meraki wireless solutions.
• Perform RF design and wireless site surveys (Ekahau or similar), ensuring optimal WLAN coverage and performance.
• Maintain and optimize Cisco DNA Center, ISE, and WLCs for centralized management and visibility.
• Conduct capacity planning, performance tuning, and QoS optimization for real‑time, and data services.
• Implement and maintain network segmentation, access control, endpoint profiling and security policies in coordination with cybersecurity teams.
• Implement security protocols and ensure compliance with industry standards (e.g., WPA3, 802.1X).
• Manage redundant WAN and SD‑WAN links, ensuring optimal failover and traffic routing across sites.
• Lead network refresh, expansion, and migration projects, from design to deployment.
• Assist in capacity planning and future‑proofing wireless infrastructure for scalability and emerging technologies (e.g., WiFi 6/6E/7, IoT).
• Troubleshoot complex issues across Layer 1‑7, providing deep‑dive analysis and long‑term remediation.
• Develop and maintain accurate network documentation – diagrams, configurations, and operational procedures.
• Participate in on‑call rotation and provide Tier 2/3 support for escalated network issues.
• Research, test, and recommend new LAN/WLAN technologies, network automation, and monitoring improvements.

• 5 + years of experience supporting enterprise Cisco networks (campus and branch).
• Expert‑level understanding of Cisco LAN technologies: VLANs, STP, Ether Channel, VTP, QoS, 802.1X, DHCP snooping, IP helper, etc.
• Strong knowledge of Cisco routing protocols: OSPF, EIGRP, and BGP; VRF and VXLAN experience a plus.
• Proficiency with WLAN standards (802.11a/b/g/n/ac/ax), wireless security (WPA2/3, 802.1X), and RF troubleshooting.
• Hands‑on experience with Cisco DNA Center, ISE, and WLC platforms.
• Familiarity with Cisco Meraki cloud‑managed networking is advantageous.
• Understanding of network automation and scripting (Python, Ansible, or REST APIs).
• Experience integrating with Cisco Secure Access (ISE/NAC) and implementing zero‑trust principles.
• Skilled with network monitoring and visibility tools such as Solar Winds, Net Flow, or Cisco Thousand Eyes.
• Excellent communication and documentation skills; able to translate technical insight into clear action.

• CCNP Enterprise or higher (e.g., CCIE Enterprise Infrastructure – a strong plus)
• CWNA / CWDP or equivalent WLAN certification
• Cisco Certified Specialist in Enterprise Design or Wireless Implementation
• Experience with Cisco DNA Center, and ISE.
• Exposure to cloud networking (Azure, AWS) and SD‑WAN technologies.
• ITIL Foundation or similar process certification – a plus
• Knowledge of network automation tools (Python, Ansible) – is a plus.

• The network hums quietly – stable, secure, and optimized.
• Campus and branch users experience seamless connectivity, whether wired or wireless.
• You proactively identify issues before users notice them.
• Automation and visibility tools reduce manual intervention and increase uptime.
• You're a trusted voice in design discussions and a reliable partner during incident response.

Inclusion statement In order to provide equal employment and advancement opportunities to all individuals, employment decisions at 3DS are based on merit,…