Sr. L3 Network Engineer

About the role

Day-to-day: Design and implement Layer 2/3 network architectures on Cisco Catalyst platforms, develop BGP routing strategies, troubleshoot production network issues, mentor junior engineers, and maintain configuration documentation

You'll bring: 8+ years enterprise network engineering, deep Cisco Catalyst 9300 expertise, BGP routing knowledge, microsegmentation design experience, Bachelor's in Computer Science/IT or equivalent, strong problem-solving skills

Good fit if: Experience with Cisco Catalyst 9800 wireless controllers and designing networks in Operational Technology environments

Generated from the recruiter description below. The full posting is the source of truth — always read it before applying.

About Client:
The client is a prominent global technology solutions provider, renowned for its comprehensive range of services and products tailored to meet the diverse needs of businesses.
The company's core focus revolves around assisting organizations in managing and optimizing their IT operations, thereby driving productivity, efficiency, and innovation. It offers an extensive array of services, including strategic consulting, technology implementation, cloud computing, data center management, cybersecurity, software licensing, and hardware procurement.
In addition to its business-to-business (B2B) services, it also serves as a valuable resource for IT professionals and decision-makers, providing valuable insights and thought leadership through its various publications, webinars, and events.

Rate Range: $75-$85/Hr

Job Description:

• We are seeking a Sr. L3 Network Engineer to join our network infrastructure team. This role requires a highly skilled professional with deep expertise in enterprise network design, implementation, and troubleshooting.
• You will be responsible for architecting complex network solutions, optimizing network performance, and ensuring secure, reliable connectivity across our infrastructure.

Key Responsibilities:

• Design and implement advanced Layer 2 and Layer 3 network architectures using Cisco Catalyst platforms
• Develop and deploy BGP routing strategies for both internal and external network connectivity
• Create innovative network solutions to address complex business requirements and technical challenges
• Implement and manage microsegmentation technologies to enhance network security and isolation
• Collaborate with cross-functional teams to translate business needs into scalable network designs
• Troubleshoot and resolve complex network issues in production environments
• Maintain documentation and best practices for network configurations and procedures
• Provide technical guidance and mentorship to junior network engineers

Required Qualifications:

• Strong understanding of Layer 2 protocols and concepts including RSTP, VLANs, Trunk/Access ports, Layer 2 forwarding, and MAC address tables, specifically on the Cisco Catalyst 9300 platform
• Strong understanding of BGP routing protocols, including iBGP and eBGP configurations and optimization
• Proven design experience with the ability to architect solutions and deliver new network features
• Solid fundamental understanding of Layer 3 networks and routing principles
• Hands-on experience designing and implementing microsegmentation technologies such as PVLANs, Trustsec/SGTs, or equivalent security segmentation methods
• Bachelor's degree in Computer Science, Information Technology, or related field, or equivalent professional experience
• 8+ years of enterprise network engineering experience
• Excellent analytical and problem-solving skills
• Strong verbal and written communication abilities

Highly Preferred Qualifications:

• Meaningful experience working with Cisco Catalyst 9800 wireless controllers
• Hands-on experience designing and supporting networks in Operational Technology (OT) environments

Physical Requirements:

• Ability to lift and carry up to 50 pounds regularly
• Capable of standing, walking, and climbing ladders for extended periods
• Comfortable working in data center environments with varying temperatures and noise levels
• Ability to travel up to 20% for site visits, maintenance, and project deployments

Interview Process:

• Please note: No artificial intelligence tools or applications are permitted during the interview process. All assessments and discussions will be conducted using traditional methods only.

Please note that ApTask offers subsidized insurance coverage to our employees.

About ApTask:
ApTask is a leading global provider of workforce solutions and talent acquisition services, dedicated to shaping the future of work. As an African American-owned and Veteran-owned company, ApTask offers a comprehensive suite of services, including staffing and recruitment solutions, managed services, IT consulting, and project management. With a focus on excellence, collaboration, and innovation, ApTask provides unparalleled opportunities for professional growth and development. As a member of the ApTask team, you will have the chance to connect businesses with top-tier professionals, optimize workforce performance, and drive success across diverse industries. Join us at ApTask and be part of our mission to empower organizations to thrive while fostering a diverse and inclusive work environment.

Applicants may be required to attend interviews in person or by video conference. In addition, candidates may be required to present their current state or government issued ID during each interview.

Candidate Data Collection Disclaimer:
At ApTask, we prioritize safeguarding your privacy. As part of our recruitment process, certain Personally Identifiable Information (PII) may be requested by our clients for verification and application purposes. Rest assured, we strictly adhere to confidentiality standards and comply with all relevant data protection laws. Please note that we only collect the necessary information as specified by each client and do not request sensitive details during the initial stages of recruitment.

If you have any concerns or queries about your personal information, please feel free to contact our compliance team at compliance@aptask.com.

Applicant Consent:
By submitting your application, you agree to ApTask's (https://aptask.com) Terms of Use and Privacy Policy, and provide your consent to receive SMS and voice call communications regarding employment opportunities that match your resume and qualifications. You understand that your personal information will be used solely for recruitment purposes and that you can withdraw your consent at any time by contacting us at 732-355-8000 or help@aptask.com. Message frequency may vary. Msg & data rates may apply.

About technology at ApTask

Technology roles at ApTask cover the software, cloud, data, security, and platform-engineering functions that power Fortune 500 digital operations. Our recruiters specialize in high-signal technical calibration — every candidate is validated against the specific stack, framework versions, and deployment context the client runs, not a keyword match. Our largest engagements sit inside AWS, Azure, GCP, Snowflake, Databricks, and modern data-mesh estates. Because we route through Fieldglass, Beeline, Workday VNDLY, and Coupa VMS, technology contractors placed through ApTask carry MBE diversity spend against the client's supplier program while remaining W-2 with full benefits under our payroll.