Linux System Administrator – VoIP (Telecom)

Voiceflex; Greater London; On-site; GBP 50,000 - 80,000; Full time

Job summary

An established industry player is seeking a skilled Linux System Administrator to manage and optimize VoIP servers in a dynamic telecom environment. This role involves deploying and configuring systems, ensuring high availability, and collaborating with cross-functional teams to deliver top-notch telecom services. If you have a passion for technology and a proven track record in Linux administration, this is an exciting opportunity to make a significant impact in a forward-thinking company. Join a team where your expertise will be valued and your contributions will drive innovation in the telecom sector.

Qualifications

• 6+ years of experience in Linux System Administration within telecom or VoIP.
• Strong knowledge of Asterisk, Kamailio, and FreeSWITCH essential.
• Proficiency in shell scripting and MySQL replication strategies.

Responsibilities

• Manage Linux-based VoIP servers for telecom operations.
• Deploy and optimize Asterisk, Kamailio, and FreeSWITCH systems.
• Ensure uptime and reliability of VoIP infrastructure.

Skills

Linux System Administration

Asterisk

Kamailio

FreeSWITCH

MySQL Replication

Shell Scripting (Bash)

Network Protocols (DNS, IP, SNMP)

VoIP Protocols (SIP, RTP, SDP)

Performance Monitoring

Database Query Writing

Tools

Corosync

Pacemaker

DRDB

Libvirt

KVM

tcpdump

Wireshark

Icinga

Cacti

Prometheus

Grafana

Ansible

Terraform

Job description

Voiceflex Greater London, England, United Kingdom

Voiceflex Greater London, England, United Kingdom

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• Manage and maintain Linux-based VoIP servers supporting large-scale telecom operations.
• Set up and configuration of Highly available platforms using Corosync/Pacemaker/DRDB
• Deployment and configuration of systems using Llibvirt / KVM
• Deploy, configure, and optimize, Kamailio, Asterisk and FreeSWITCH in production environments.
• Implement and maintain MySQL replication strategies (master-slave and multi-master setups).
• Troubleshoot configuration, call quality issues, latency, and signaling anomalies.
• Automate routine tasks with scripts and configuration management tools.
• Ensure 24/7 uptime and reliability of VoIP infrastructure through proactive monitoring and incident response.
• Collaborate with network, NOC, and development teams to support telecom service delivery.
• Building of packages and maintaining repositories.
• Monitoring and maintenance of co-located hardware.

Required Skills and Experience

• 6+ years of experience as a Linux System Administrator in a telecom or VoIP environment.
• Strong working knowledge of Asterisk, Kamailio, and FreeSWITCH.
• Solid understanding of Network protocols (DNS, IP, SNMP)
• Good understanding of VoIP protocols (SIP, RTP, SDP) and NAT traversal techniques.
• Hands-on experience with MySQL replication and performance tuning.
• Writing of database queries to analyse data
• Proficiency in shell scripting (Bash); experience with Python or Perl is a plus.
• Experience with network tools (tcpdump, Wireshark, iptables) and performance monitoring systems.
• Ability to support production systems in a high-availability environment using tools like Icinga, Cacti, Prometheus and Graphana.
• Ability to manage and configure email systems.

Preferred Qualifications

• Experience with telecom platforms.
• Familiarity with cloud hosting environments (AWS, Azure) and virtualization (KVM, Xen VMware).
• Knowledge of DevOps practices, CI/CD, and infrastructure automation tools (e.g., Ansible, Terraform).
• Awareness and experience with Redis.

Seniority level

• Seniority level

  Mid-Senior level

Employment type

• Employment type

  Full-time

Job function

• Job function

  Information Technology

• Industries

  Telecommunications

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