Core4ce is seeking a Senior Enterprise Network Services Engineer to design, implement, and maintain secure and scalable enterprise network infrastructures. The ideal candidate will have a strong background in network engineering, security, routing, firewall management, load balancing, and automation. This role requires deep knowledge of TCP/IP networking, encryption protocols, traffic analysis, scripting, and cloud networking. Additionally, the candidate will be responsible for planning IT security projects, troubleshooting complex network issues, and ensuring compliance with security policies. Responsibilities - Design, configure, install, and manage enterprise network infrastructure, including routers, switches, firewalls, and load balancers. - Plan and schedule the installation or modification of network hardware and software. - Implement and maintain secure network configurations across multi-VRF Cisco routers and enterprise environments. - Troubleshoot and analyze TCP/IP network traffic, including TCP 3-way handshake, TCP window scaling, and MSS. - Capture and analyze network packets using TCPDump (Linux) and Flow Monitor Capture (Cisco ASR). - Implement multi-protocol routing solutions with BGP, OSPF, and VRF-based networks. - Use Wireshark, TCPDump, and other diagnostic tools for network performance analysis. - Perform TLS/SSL handshake troubleshooting and security configuration. *This position is designed to be flexible, with responsibilities evolving to meet business needs and enable individual growth. Network Security & Compliance - Configure and maintain firewalls (Palo Alto, Cisco), including security policies, VPNs, and intrusion prevention systems (IPS). - Implement AAA technologies (Cisco ISE, LDAP, OTP) for access management. - Ensure certificate management and encryption, including TLS/SSL and OpenSSL operations. - Install, configure, and troubleshoot digital certificates on F5 LTM/GTM/APM/ASM appliances. - Implement F5 Client Constrained Delegation (C3D) for certificate delegation. - Enable certificate-based authentication using Client-SSL profiles and APM policies. - Performance Monitoring & Troubleshooting - Deploy and maintain network monitoring, alerting, and repair systems in production environments. - Troubleshoot BGP neighbor configurations, VPNv4 unicast summary, and OSPF network participation. - Analyze DUP ACK packets, out-of-order segments, and retransmission issues. - Optimize and troubleshoot load balancing solutions and DNS-based traffic management. Cloud & Virtualization Integration - Manage and support cloud-based network services across Azure, AWS, and Oracle Cloud. - Configure and maintain virtualized network appliances in VMware environments. Automation & Scripting - Utilize Python and BASH scripting for network automation and troubleshooting. - Develop scripts using REST APIs, Syslog, XML, and SNMP for automation. - Use regular expressions (e.g., ".*", "^", "$") for scripting and log parsing. Requirements - Minimum 4 years of hands-on experience as a Network Administrator or Network Security Engineer. - Secret clearance w/Tier 5 investigation - Strong knowledge of OSI and TCP/IP network models, TCP 3-way handshake, and window scaling. - Experience with Palo Alto and Cisco firewalls. - Experience with F5 LTM, GTM, APM, ASM for load balancing and security. - Cisco Certified Network Professional (CCNP) certification or equivalent experience or willingness to get within 45 days of hire Preferred - Strong troubleshooting skills with routing protocols (BGP, OSPF, VRF, LISP). - Familiarity with network packet capture tools (TCPDump, Wireshark). - Understanding of essential network services (DNS, SMTP, NTP, IMAP, SNMP). - Experience in TLS/SSL security, OpenSSL, and certificate management. - Proficiency in scripting languages (Python, BASH) and automation tools. - Experience working with Unix/Linux-based systems. - Experience with network automation (REST APIs, Syslog, XML, SNMP). - Experience deploying and troubleshooting load-balanced services and SSL certificate management. - Familiarity with multi-cloud networking (Azure, AWS, Oracle Cloud). - Experience working with Puppet Labs or SaltStack configuration management Why Work for Us? Core4ce is a team of innovators, self-starters, and critical thinkers—driven by a shared mission to strengthen national security and advance warfighting outcomes. We offer: - 401(k) with 100% company match on the first 6% deferred, with immediate vesting - Comprehensive medical, dental, and vision coverage—employee portion paid 100% by Core4ce - Unlimited access to training and certifications, with no pre-set cap on eligible professional development - Tuition assistance for job-related degrees and courses - Paid parental leave, PTO that grows with tenure, and generous holiday schedules - Got a big idea? At Core4ce, The Forge gives every employee the chance to propose bold innovations and help bring them to life with internal backing. Join us to build a career that matters—supported by a company that invests in you. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex (including pregnancy), national origin, disability, veteran status, age, genetic information, or other legally protected status.

• Lead complex, large-scale Network and Security projects • Create low-level detailed designs that align with the business strategy, the customer’s budget, and operational support capabilities • Perform Network and Security Assessments • Collaborate as part of a multi-functional team with Sales, Pre-Sales, Project Management, and other delivery/engineering resources • Trouble resolution of complex issues and assisting team members in solving problems with their deployments

Req ID: 133592 Region: Americas Country: USA State/Province: Texas City: Richardson General Overview Functional Area: Information Technology (ITM) Career Stream: IT Infrastructure (INFR) Role: Specialist (SPE) Job Title: Specialist, IT Infrastructure Job Code: SPE-ITM-INFR Job Level: Level 08 Direct/Indirect Indicator: Indirect Summary The Specialist, IT Infrastructure - Network Support will install, maintain, upgrade, and continuously improve the site's operating environment, ensuring the ongoing reliability, performance and security of the infrastructure. This includes monitoring and upkeeping the operating environments; responding to incidents & problems, planning for growth, deployment of new technologies as well as design, install, configure, maintain and perform testing of PC/server operating systems, networks, and related utilities and hardware. Other responsibilities include troubleshooting problems as reported by users, supporting Web access and telephony services, and the acquisition, replacement and decommissioning of related equipment, software and services. Detailed Description Performs tasks such as, but not limited to, the following: - Participates in the development of an effective network design and strategy - Provide technical support and perform maintenance - Provides technical guidance to customers and departmental staff on network issues - Perform service monitoring and reporting, with a focus on risk management and compliance - Explore new solutions, enhancements and opportunities for continuous improvement, projects and more - Provides network troubleshooting and effective solutions to network problems while minimizing downtime. - Installing and configuring network equipment to update or fix hardware or software issues - Monitoring computer systems to improve network performance for computer systems and networks - Lead projects and change management initiatives - Manages external service providers and vendors - Configure, maintain, and troubleshoot Internet Proxy to ensure secure and optimized internet access. - Configure, maintain, and troubleshoot VPN to enable secure remote connectivity to internal resources. - Administer and manage application control policies, application controls, and endpoint security configurations to strengthen cybersecurity posture. Knowledge/Skills/Competencies - Strong customer service orientation - Strong analytical, troubleshooting and problem solving skills. - Good communication (both oral and written) and documentation skills. - Good leadership and teamwork skills. - Negotiation and conflict resolution skills. - Good ability to plan projects and tasks. - Good understanding of IT requirements for an end to end solution, including security, business continuity, disaster recovery, risk analysis and preparing business cases. - In-depth knowledge of the Windows OS (server and client) and the desktop operating environment. Linux and other mainstream OS knowledge will be helpful. - Fundamental knowledge of networking concepts - Fundamental knowledge of ITIL 4 Foundation - Advanced knowledge of infrastructure service management & diagnostic tools and processes - Advanced knowledge of end-point security management tools and processes - Experience handling network security issues (viruses, malware, social engineering) - Understanding of IT Infrastructure asset lifecycle management - Plus: Understanding of NIST CSF and 800-171. Physical Demands - Duties of this position are performed in a normal office environment. - Duties may require extended periods of sitting and sustained visual concentration on a computer monitor or on numbers and other detailed data. Repetitive manual movements (e.g., data entry, using a computer mouse, using a calculator, etc.) are frequently required. Typical Experience - 4 to 6 years of relevant experience in a similar role or industry. Typical Education - Bachelor's Degree in related field - Vendor Certifications preferred: CompTIA Security+ or Network+, CheckPoint or FortiGate Firewall, Cisco CCNA or CCNP, Fortinet Certified Professional or Solution Specialist. Notes This job description is not intended to be an exhaustive list of all duties and responsibilities of the position. Employees are held accountable for all duties of the job. Job duties and the % of time identified for any function are subject to change at any time. This is a remote position located in the US. $71,370- $94,574. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability, or status as a protected veteran. Celestica's policy on equal employment opportunity prohibits discrimination based on race, color, creed, religion, national origin, gender, sexual orientation, gender identity, age, marital status, veteran or disability status, or other characteristics protected by law. This policy applies to hiring, promotion, discharge, pay, fringe benefits, job training, classification, referral and other aspects of employment and also states that retaliation against a person who files a charge of discrimination, participates in a discrimination proceeding, or otherwise opposes an unlawful employment practice will not be tolerated. All information will be kept confidential according to EEO guidelines. COMPANY OVERVIEW: Celestica (NYSE, TSX: CLS) enables the world's best brands. Through our recognized customer-centric approach, we partner with leading companies in Aerospace and Defense, Communications, Enterprise, HealthTech, Industrial, Capital Equipment and Energy to deliver solutions for their most complex challenges. As a leader in design, manufacturing, hardware platform and supply chain solutions, Celestica brings global expertise and insight at every stage of product development – from drawing board to full-scale production and after-market services for products from advanced medical devices, to highly engineered aviation systems, to next-generation hardware platform solutions for the Cloud. Headquartered in Toronto, with talented teams spanning 40+ locations in 13 countries across the Americas, Europe and Asia, we imagine, develop and deliver a better future with our customers. Celestica would like to thank all applicants, however, only qualified applicants will be contacted. Celestica does not accept unsolicited resumes from recruitment agencies or fee based recruitment services. This location is a US ITAR facility and these positions will involve the release of export controlled goods either directly to employees or through the employee's movement within the facility. As such, Celestica will require necessary information from all applicants upon an applicant's acceptance of employment to determine if any export control exemptions or licenses must be filed.

Entity: Oracle America, Inc. Job Duties: Support the design, deployment, and operations of a large-scale global Oracle cloud-computing environment. Develop and support network fabric and systems. Develop and implement solutions for network issues, safely executing network changes. Participate in network lifecycle management through network build and/or upgrade projects. May participate in network solution and architecture design process. Participate in operational rotations as either primary or secondary. Provide break-fix support for events and may serve as escalation point for event remediation. Provide root cause analysis as needed. Develop scripts to automate routine tasks for team. May support network vendor software bug fixes. May work at various unanticipated locations throughout U.S. May telecommute. (385.36371) Employer will accept a Bachelor's degree in Computer Science, Engineering, or related technical field and 8 years of experience in the job offered or in a Network Developer-related occupation. *In lieu of a Bachelor's degree, employer will accept 2 years of work experience. Position requires: Cluster Network Engineering; BGP; Python; Virtual Extensible LAN; Network Architecture; Network Monitoring; and Network automation. Only Oracle brings together the data, infrastructure, applications, and expertise to power everything from industry innovations to life-saving care. And with AI embedded across our products and services, we help customers turn that promise into a better future for all. Discover your potential at a company leading the way in AI and cloud solutions that impact billions of lives. True innovation starts when everyone is empowered to contribute. That’s why we’re committed to growing a workforce that promotes opportunities for all with competitive benefits that support our people with flexible medical, life insurance, and retirement options. We also encourage employees to give back to their communities through our volunteer programs. We’re committed to including people with disabilities at all stages of the employment process. If you require accessibility assistance or accommodation for a disability at any point, let us know by emailing accommodation-request_mb@oracle.com or by calling 1-888-404-2494 in the United States. Oracle is an Equal Employment Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, national origin, sexual orientation, gender identity, disability and protected veterans’ status, or any other characteristic protected by law. Oracle will consider for employment qualified applicants with arrest and conviction records pursuant to applicable law.