Network & Voice Engineer: VoIP, CCaaS & SD-WAN Expert

E‑Frontiers; Lisboa; On-site; EUR 38,000 - 58,000; Full time

Job summary

E-Frontiers is seeking a Network & Voice Engineer to support a consultancy with European reach. You will manage daily operation of network and voice services, including VoIP, CCaaS, and SIP-based systems, while coordinating with Level 3 engineers and vendors.

You will optimize QoS, troubleshoot connectivity across LAN/WAN and cloud services, and drive small-to-mid-scale projects, maintaining documentation and ensuring service delivery excellence.

Qualifications

• Strong background in enterprise networking and voice technologies.
• Experience with SIP/RTP, SBCs, dial plans and call routing.
• Hands-on troubleshooting of incidents, escalations, and cross-functional collaboration with vendors.

Responsibilities

• Oversee daily operational support for network and voice services, resolving incidents and fulfilling service requests.
• Perform advanced diagnostics and coordinate with Level 3 engineers and external vendors.
• Administer VoIP and CCaaS solutions including Genesys Cloud CX and Microsoft Teams telephony; manage SIP, RTP, SBCs, dial plans, call routing and contact center workflows.
• Maintain and troubleshoot enterprise connectivity across LAN/WAN, SD-WAN, MPLS, BGP, VPN, wireless, and security environments; support on-premises and cloud services.
• Analyze network and voice performance, optimize QoS configurations for real-time communications, and contribute to capacity planning.
• Implement network and voice infrastructure changes, upgrades, and small-to-medium-scale projects; collaborate with teams and stakeholders to improve service delivery.

Skills

Enterprise networking

Routing & switching

SD-WAN

MPLS & VPN

BGP

Wireless networking

Network security

Voice & UC

SIP & RTP

SBC

Dial plan config

Call routing

QoS

CCaaS platforms

Genesys Cloud

Microsoft Teams telephony

Job description

E-Frontiers is seeking a Network & Voice Engineer to support a consultancy with European reach. You will manage daily operation of network and voice services, including VoIP, CCaaS, and SIP-based systems, while coordinating with Level 3 engineers and vendors.

You will optimize QoS, troubleshoot connectivity across LAN/WAN and cloud services, and drive small-to-mid-scale projects, maintaining documentation and ensuring service delivery excellence.