Upstream

Senior Network Engineer

Upstream

full-time

Posted on:

Location Type: Hybrid

Location: Gerakas • Greece

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Job Level

Senior

Tech Stack

AWSAzureCloudFirewallsGoogle Cloud PlatformSwitchingVMware

About the role

  • Technical Leadership & Mentorship: Act as a lead for complex projects; provide technical guidance and mentorship to mid-level and junior engineers to foster a culture of continuous learning.
  • Infrastructure Architecture: Design, implement, and evolve resilient LAN/WAN and Data Center architectures (Cisco Nexus, VPC) that align with business growth.
  • Network Automation: Drive operational efficiency by implementing automation techniques (e.g., dynamic routing link backup).
  • Security & Compliance: Lead the hardening of network security postures. Manage Next-Gen Firewalls (Fortinet, Check Point, FortiGate, NAC (Aruba ClearPass/Cisco ISE), and Zero Trust frameworks.
  • Lifecycle Management: Proactively manage the lifecycle of network assets, including capacity planning, security advisories, firmware orchestration, and performance tuning.
  • Cloud Integration: Design and manage hybrid-cloud connectivity (AWS/Azure/GCP), ensuring seamless integration between on-premise data centers and cloud VPCs.
  • Escalation Support: Serve as the final escalation point (L3) for complex network outages, participating in an on-call rotation to ensure 24/7 service availability.
  • Vendor & Stakeholder Management: Collaborate with external vendors and internal DevOps/System teams to integrate network solutions.

Requirements

  • 8+ years of hands-on experience in enterprise-grade network environments.
  • BSc/MSc in Computer Science, Network Engineering, or a related field.
  • **Core Networking**: Expert-level command of switching and routing protocols (**BGP, OSPF, EIGRP, STP, LACP, HSRP**).
  • **Network Security**: Deep expertise in **NGFW** (FortiGate, Check Point, Cisco ASA / FTD), **VPN technologies** (IPsec, SSL), and **SD-WAN **implementation.
  • **Wireless & Access Control**: Advanced knowledge of Enterprise WiFi (**Aruba Central**) and Identity Management (**ClearPass or Cisco ISE**).
  • **Application Delivery**: Experience with L4-L7 Load Balancing (**F5 BIG-IP LTM**) and Web Application Firewalls (**F5 Big-IP AWAF/FortiWeb**).
  • **Cloud & Virtualization**: Proven experience with **Cloud Networking** (VPC, Subnetting, Network ACL/Security Groups, Site-to-Site VPN with on-premises DCs, ExpressRoute) and Virtualization (VMware NSX, VRFs, VDOMs, VSX, FPR).
  • **Certifications**: Professional level certification (e.g., **CCNP, NSE 4-7, CCSA-CCSE**) are required; Expert level (CCIE) is a significant plus.
  • **Fluent**: Excellent command of both Greek and English (written and verbal) is essential for this role.
Benefits
  • We offer a competitive base salary and benefits, directly dependent on the candidate’s qualifications and skills.
  • The real excitement comes from working closely with a dynamic, smart, agile, and highly motivated team in a competitive and fast-paced environment.
  • Upstream is an equal-opportunity employer.
Applicant Tracking System Keywords

Tip: use these terms in your resume and cover letter to boost ATS matches.

Hard Skills & Tools
LAN/WAN architectureData Center architecturenetwork automationBGPOSPFEIGRPSTPLACPHSRPNGFW
Soft Skills
technical leadershipmentorshipcollaborationproblem-solvingcommunication
Certifications
CCNPNSE 4-7CCSA-CCSECCIE