Network & Voice Engineer - Freelance

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

At E-Frontiers we're on the lookout for a Network & Voice engineer to join a consultancy company based in several european regions.

As N&V Engineer you will:

Oversee daily operational support for network and voice services, resolving incidents, fulfilling service requests, and managing escalations. Perform advanced diagnostics and coordinate with Level 3 engineers and external vendors to address complex technical challenges.

Administer and support VoIP and CCaaS solutions, including Genesys Cloud CX and Microsoft Teams telephony. Manage SIP, RTP, SBCs, dial plans, call routing, and contact center workflows to maintain service availability and voice quality.

Maintain and troubleshoot enterprise connectivity across LAN/WAN, SD-WAN, MPLS, BGP, VPN, wireless, and security environments, supporting both on-premises infrastructure and cloud-based services.

Analyze network and voice performance, optimize QoS configurations for real-time communications, contribute to capacity planning, and implement proactive measures to prevent service degradation.

Implement network and voice infrastructure changes, upgrades, and small-to-medium-scale projects, ensuring smooth deployments and contributing to the evolution of existing platforms.

• Collaborate with engineering teams, service providers, and business stakeholders to resolve complex issues, maintain technical documentation, streamline operational processes, and drive continuous service improvement.
  

Required skills:

Strong technical background in enterprise networking, including routing and switching, SD-WAN, MPLS, BGP, VPN, wireless technologies, and network security, with hands-on experience diagnosing and resolving complex connectivity issues.

Experienced in voice and unified communications technologies, covering SIP, RTP, SBC, dial plan configuration, call routing, QoS, telephony troubleshooting, and contact center workflows, alongside CCaaS platforms such as Genesys Cloud and Microsoft Teams telephony.

Skilled in managing operational incidents, performing root cause analysis, monitoring service health, and troubleshooting issues across Level 2 and selected Level 3 scenarios, with the ability to work autonomously and support critical incident resolution.

• Effective in coordinating technical activities, maintaining clear documentation, and communicating with stakeholders, while working closely with senior engineers, third-party providers, and cross-functional teams to implement solutions and improve service delivery.