Senior Network Engineer

Customized Energy Solutions (CES) is a global energy services and technology company that helps market participants operate, comply, and compete in deregulated electricity and natural gas markets. Founded in 1998 and headquartered in Philadelphia, CES works with utilities, independent power producers, energy suppliers, developers, asset owners, and investors across North America and globally.

CES delivers market intelligence, regulatory and market design support, asset and portfolio management, retail market operations, and energy technology solutions. Our teams track and interpret ISO/RTO rules and policy developments, support resource planning and market participation, manage operational and settlement processes, and develop proprietary software platforms—including CES BLUE, GOLD, RED, GRIDBOOST, and CoMETS—that help clients manage risk, optimize performance, and respond effectively to market change.

CES is committed to advancing transparent, efficient, and non-discriminatory energy markets while delivering practical, high-quality solutions marked by integrity, rigor, and long-term client value.

CES has been nationally and regionally recognized for sustained growth and innovation, including listings on theInc. 500|5000andPhiladelphia Business Journal’s Top 100 Companies, as well as aBest Places to Work designation with Hall of Fame status for five or more consecutive years.

With headquarters in Philadelphia and offices across the U.S., Canada, Japan, India, and Vietnam, CES offers a collaborative, flexible, and globally connected work environment for professionals passionate about the future of energy.

The Senior Network Engineer is a hands-on technical leader responsible for designing, implementing, securing, and supporting CES’s enterprise network infrastructure across North America, India, Vietnam, and Japan. This position reports to the Senior Cloud and Network Security Architect.

The role serves as the primary owner of on-premises routing, switching, firewall, and network security platforms and supports their integration with CES’s cloud and hybrid environments. The successful candidate must be able to manage competing priorities, lead complex network projects, and maintain reliable day-to-day operations.

This position works directly with internal stakeholders and external clients to address connectivity requirements, resolve service-impacting issues, and communicate clearly with both technical and non-technical audiences.

This is an on-site position based at CES’s Philadelphia headquarters. A hybrid work arrangement may be considered in the future based on operational needs and demonstrated performance.

• Design, implement, upgrade, and maintain routing and switching infrastructure across CES locations.
• Manage a multi-site, multi-circuit WAN environment with appropriate redundancy, availability, and failover.
• Configure and support advanced routing protocols, including BGP, OSPF, and EIGRP.
• Establish and maintain network standards, configuration baselines, and change management procedures.
• Lead network projects from requirements and planning through implementation, validation, and post-implementation review.
• Evaluate and recommend network technologies, vendors, and platforms based on business, security, and growth requirements.

• Manage Cisco ASA, Cisco Firepower/FMC, Palo Alto Networks, and other network security platforms.
• Administer Cisco ISE, including 802.1X, NAC, RADIUS/TACACS+, guest access, and endpoint profiling.
• Configure and maintain F5 BIG-IP load balancers and web application firewalls.
• Develop and maintain firewall rules, access control policies, and network segmentation strategies.
• Serve as the senior escalation point for firewall and network security incidents.

• Manage primary and failover circuits, carrier relationships, SLA performance, and connectivity issues.
• Design and maintain site-to-site, DMVPN, and remote-access VPN infrastructure.
• Implement QoS policies for business-critical traffic.
• Integrate on-premises networks with AWS, Azure, and other cloud environments using Direct Connect, Express Route, Transit…