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Randstad Logo Randstad · IT - Administration

Application Support Engineer

United Kingdom, Sheffield · Job Posted May 29, 2026
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Job Description

We are seeking a highly specialized Application Support Engineer to provide comprehensive SME consultancy and production support for our Kamailio and PJSIP infrastructure. You will handle everything from incident management and root cause analysis (RCA) to performance tuning, patching, and lifecycle upgrades for our voice/SIP platforms.

Job Responsibility

  • Provide L2/L3 incident support, bug-fix patching, and vulnerability remediation
  • Analyze configuration changes and ensure seamless integration with upstream/downstream SIP platforms
  • Troubleshoot PJSIP-based transcription connectors and tune system performance
  • Deliver documentation, operational runbooks, and knowledge transfer
  • Participate in governance and offer best-practice guidance for monitoring and system resilience

Requirements

  • Kamailio Expertise: Strong background in SIP routing logic, dispatcher/failover configuration, load balancing, and multi-node/clustered high-availability deployments
  • PJSIP Expertise: Deep understanding of PJSIP library/services, SIP stack behavior, signaling session stability, and media session troubleshooting
  • Troubleshooting: Expert level at analyzing SIP headers, routing failures, loop scenarios, and interoperability issues
  • Voice Integration: Experience with SIPREC and voice transcription chains
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