Network Testing Engineer Jobs in Seattle, WA (NOW HIRING)

Job Title: Network Engineer, Mobile Core Network Services                       

Location: Bellevue, Washington 98004

Onsite/Remote: Onsite (5 days/week) (Local Candidates)

Previous Cisco Experience Required: Needs to be extremely well-versed in all things Cisco / Cisco products

 Position Overview/Role Summary:

Client is seeking an experienced Network Engineer to support testing, deployment, upgrades, and operational optimization within a mobile core networking environment. This role will focus on validating network solutions, supporting production implementations, consulting on network design, and providing technical expertise during large-scale network initiatives. The ideal candidate brings strong hands-on experience with mobile core technologies, network testing methodologies, and production network support.

Responsibilities:

• Provide technical guidance and advisory support for network enhancements, infrastructure upgrades, and architecture improvements.
• Collaborate with stakeholders to understand testing objectives, technical requirements, and business goals.
• Develop, execute, and document network test plans and communicate results through professional reporting.
• Support the design, implementation, and validation of laboratory environments, feature enhancements, and infrastructure upgrades.
• Create migration documentation and support activities associated with transitioning solutions from laboratory environments into production.
• Provide technical insight during escalation activities and collaborate with support organizations to accelerate service restoration.
• Consult on network architecture with emphasis on resiliency, scalability, performance, and service quality.
• Review and assess proposed network changes for risk, impact, and implementation readiness.
• Support major deployment events and assist with troubleshooting hardware and configuration issues.
• Share technical knowledge through documentation, informal training sessions, and knowledge transfer activities.
• Participate in recurring customer meetings, service reviews, and operational planning discussions.
• Contribute to operational reporting, risk assessments, and future planning activities.

Required Qualifications:

• Experience supporting mobile core network environments, including packet core technologies.
• Strong understanding of 5G networking concepts and call flow analysis.
• Experience developing and executing structured network testing plans.
• Ability to create technical documentation, including test reports, implementation plans, migration guides, and operational reports.
• Experience supporting production network deployments and infrastructure upgrade activities.
• Knowledge of network design principles including resiliency, scalability, fault recovery, and Quality of Service.
• Experience evaluating implementation procedures and conducting change impact assessments.
• Strong troubleshooting skills for network hardware, software, and configuration issues.
• Excellent verbal and written communication skills.
• Ability to work onsite during standard business hours (8 AM - 5 PM)
• Ability to participate in after-hours deployment activities and respond to critical incidents when required.

Preferred:

• Experience working within large enterprise or service provider network environments.
• Experience supporting laboratory to production migration initiatives.
• Previous experience delivering technical workshops, training sessions, or knowledge transfer activities.
• Industry certifications related to networking or telecommunications.
• Experience participating in customer-facing technical reviews and operational governance meetings.

Tools & Technologies:

• Cisco Enhanced Packet Core
• 5G Mobile Networks
• Network Testing and Validation Tools
• Packet Analysis and Troubleshooting Tools
• Network Monitoring Platforms
• Technical Documentation Tools
• Change Management Processes

Working Conditions

• Standard business hours coverage, 5 days per week; occasional overtime coverage may be required and must be approved.
• Onsite presence required; unplanned/unscheduled absences are not permitted without prior formal notice and approval.
• Planned absences (e.g., vacation) require advance written approval to avoid resource overlap.