Lead VOIP Engineer

Job Title; Lead VOIP Engineer

Location: Dublin

Contract to Perm Opportunity

Job Description

We are seeking an experienced Lead VOIP Engineer to guide the architecture and technical direction of our next-generation voice infrastructure. This role involves building carrier-grade systems that ensure high availability, low latency, and global scalability, enabling mission-critical voice communication within our CCaaS platform. The position is hands-on and requires leadership in architecture, best practices, and collaboration across Engineering, DevOps, Product, and QA teams.

Responsibilities

• Design and implement VOIP infrastructure using FreeSWITCH, OpenSIPs, and RTPEngine.
• Architect session border controllers, NAT traversal, load balancing, and failover strategies.
• Define standards for call routing and audio quality optimisation, including codecs and jitter.
• Lead initiatives to enhance scalability, observability, security, and resiliency of voice infrastructure.
• Troubleshoot live traffic and provide technical leadership during major incidents.
• Collaborate with Backend and API teams to design provisioning, billing, and call analytics APIs.
• Evaluate and onboard open-source tools or commercial carriers as needed.
• Coach and mentor junior and lead engineers in VoIP best practices.

Essential Skills

• 12+ years of hands-on experience in Telephony, VoIP, or CPaaS domain.
• Strong knowledge of VoIP Protocols such as SIP/SDP, RTP/RTCP, and Networking fundamentals.
• Hands-on experience with Session Border Controller, Media Servers, and WebRTC.
• Expert-level understanding of SIP, RTP, NAT traversal, and VoIP security.
• Hands-on development experience with FreeSWITCH, OpenSIPs, and RTPEngine.
• experience designing carrier-grade telephony platforms serving millions of calls.
• Strong systems programming and debugging skills in C/C++.
• Strong troubleshooting skills with experience in network monitoring and debugging tools.
• Familiarity with distributed systems and cloud-based deployments (AWS, GCP, Azure).
• Excellent problem-solving, debugging, and performance tuning skills.

Additional Skills & Qualifications

• Hands-on C/C++ development for Real Time systems.
• experience with VoIP protocols: SIP signalling, SDP negotiation, RTP/RTCP media handling.
• Knowledge of contact center or CPaaS platforms, including PSTN/SIP trunking and global carrier integrations.

closely with cross-functional teams to build and maintain robust communication platforms, ensuring the highest standards of performance and security.

Dublin, Ireland

Trading as TEKsystems. Allegis Group Limited. Level 1, The Chase, Carmanhall Road, Sandyford, Dublin 18, Ireland. No. 909257. TEKsystems is a company within the Allegis Group network of companies (collectively referred to as "Allegis Group"). Aerotek, Aston Carter, EASi, Talentis Solutions, TEKsystems, Stamford Consultants and The Stamford Group are Allegis Group brands. If you apply, your personal data will be processed as described in the Allegis Group Online Privacy Notice available at our website.

To access our Online Privacy Notice, which explains what information we may collect, use, share, and store about you, and describes your rights and choices about this, please go our website.

We are part of a global network of companies and as a result, the personal data you provide will be shared within Allegis Group and transferred and processed outside the UK, Switzerland and European Economic Area subject to the protections described in the Allegis Group Online Privacy Notice. We store personal data in the UK, EEA, Switzerland and the USA. If you would like to exercise your privacy rights, please visit the "Contacting Us" section of our Online Privacy Notice on our website for details on how to contact us. To protect your privacy and security, we may take steps to verify your identity, such as a password and user ID if there is an account associated with your request, or identifying information such as your address or date of birth, before proceeding with your request. commitments under the UK Data Protection Act, EU-U.S. Privacy Shield or the Swiss-U.S. Privacy Shield.