Senior Network Engineer

About Us (Ensono) Ensono is an expert technology adviser and managed service provider. As a relentless ally, we accelerate clients’ digital transformation to achieve business outcomes that stand to last. Our dedicated team helps organizations optimize today’s systems across any hybrid environment with services such as consulting, mainframe and application modernization, public cloud migration and cloud-native development. With certified experts in AWS, Azure and Google Cloud and recognized as Microsoft Datacenter Transformation Partner of the Year, Ensono has over 3500+ associates globally and is headquartered in greater Chicago. We care about your success, offering comprehensive strategic and managed services for mission-critical applications. Our Advisory and Consulting services can help upfront with an application strategy or find the right places for your applications – whether it’s public, multi or hybrid cloud, or mainframe. And because we span across all mission-critical platforms, we can meet you wherever you are in your digital transformation journey, with 24/7 support when you need it. We are your relentless ally, flexing with you when challenges emerge so you don’t feel stuck in place. With cross-platform certifications and decades of experience, our technology experts have become an extension of your team so you’re continuously innovating – doing more with less while remaining secure. And that’s just the beginning. Job Summary We are seeking a highly skilled and experienced Senior Network Engineer with a minimum of 10 years of relevant experience in networking. The ideal candidate will be responsible for managing and supporting complex network infrastructures, handling major incident issues, and working in rotational shifts. This role requires deep technical expertise across routers, switches, firewalls, load balancers, Cisco ACI, and VMware NSX-T. This role contains 80% operational and 20% build and deployment work. Key Responsibilities Manage and maintain Datacenter network infrastructure. Handle major incident issues and perform root cause analysis. Participate in rotational shifts to ensure 24/7 network support. Collaborate with cross-functional teams for project implementation and support. Skills and Requirements Routers (Must Have) In-depth knowledge & hands-on experience on OSPF, EIGRP, BGP routing protocols. Good understanding of MPLS. Good understanding of hardware of different types of router models. Switches (Must Have) Hands-on experience on datacenter switches like Cisco Nexus 9K, 7K, 5K, 3K, 2K & Catalyst switches. Good understanding of switching protocols like FHRP, STP, VLAN. Good understanding of hardware of different types of switch models, SFP, Cable Types. Firewalls (Must Have) In-depth knowledge of traffic flow through firewall. IPsec VPN, SSL VPN. Hands-on experience on configuration of ACL, Security Policies, NAT. Hands-on experience on packet capture and analysis. Good understanding of Next Generation firewalls. Hands-on experience on Palo Alto or Fortigate or Cisco ASA firewalls. Load Balancers (Must Have) Hands-on experience on F5 or Netscaler or AVI load balancer. Hands-on experience on configuration of VIP, Pool, Node. Good understanding of load balancing methods. Good understanding of Sticky session methods. Good understanding of traffic handling by load balancer. Good to have knowledge on Global load balancing. Cisco ACI (Good to Have) Good understanding of Leaf/Spine architecture. Good understanding of Tenants, EPG, VXLAN. Basic knowledge on automation, Ansible. VMware NSX-T (Good to Have) Understanding of NSX-T architecture. Understanding of ESG, DLR, T0 & T1 gateway, DFW. Understanding of NSX Manager. Basic knowledge on VMware vSphere, vROPS. Certifications (Good to Have) Cisco CCNA/CCNP, Palo Alto PCNSE. Additional Skills and Responsibilities Hands-on experience with lifecycle management, including software upgrades, hardware refresh activities, and maintaining network devices on stable, vendor-supported software versions. Participate in major incident war rooms, provide technical analysis during outage situations, and contribute to root cause analysis (RCA) activities. Prepare, maintain, and update Low-Level Design (LLD) diagrams and network documentation. Review and maintain CMDB accuracy, monitoring coverage, and device configuration backup compliance; identify and remediate any operational gaps. Excellent verbal and written communication skills with proven experience managing client interactions, facilitating incident bridge calls, conducting project review meetings, and coordinating with cross-functional teams and external vendors. Shit Timing - 24/7 rotational shift. We are an equal opportunity employer. All qualified applicants will be considered for employment without regard to caste, colour, creed, religion, gender, gender identity, sexual orientation, age, disability, HIV status, or any other status protected by law. Candidates with disabilities who require accommodations during the recruitment process are encouraged to contact our Talent Acquisition team to place a request.