Cloud & Telco Engineer – SIP, Reliability

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🇬🇷 Greece – Remote

⏰ Full Time

🟡 Mid-level

🟠 Senior

👷🏻‍♀️ Engineer

👻 Ghost score 15%

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NAIRON GmbH

WebsiteLinkedInAll Job Openings

2 - 10 employees

🤖 Artificial Intelligence

☁️ SaaS

📡 Telecommunications

Artificial Intelligence • SaaS • Telecommunications

NAIRON GmbH is a Swiss-based AI telephony provider that offers an automated voice assistant for 24/7 customer support, replacing traditional phone systems with intelligent, multilingual call handling. Its cloud platform delivers call routing, conversation automation, real-time monitoring, analytics, and integrations with CRMs and knowledge bases, while offering EU/Swiss-aligned data protection and scalability to reduce support costs and improve first-call resolution.

📋 Description

• Run and harden the SIP edge, including Kamailio-based session border controllers, carrier and customer SIP trunks, PBX integrations, TLS, and SRTP • Implement redundancy and failover between zones and providers • Perform graceful draining and releases without dropping calls • Troubleshoot SIP and RTP call quality issues, including NAT traversal, codecs, DTMF, one-way audio, transfers, and re-INVITEs • Run Kubernetes on AWS and European clouds using GitOps, Argo CD, Helm, and Terraform • Handle observability and incident response through metrics, logs, traces, alerting, runbooks, and postmortems • Conduct load testing and capacity planning • Manage cost at the edge • Own reliability problems across the telco edge and cloud infrastructure supporting live calls

🎯 Requirements

• Several years running production infrastructure where downtime is visible to customers, ideally in telecom, VoIP, or real-time media • Production SIP experience: trunks, registrations, REFER, re-INVITE, NAT traversal, RTP, codecs, and DTMF • Experience with SIP proxy routing logic such as Kamailio or OpenSIPS; GUI-only PBX administration is insufficient • Linux networking and packet-level troubleshooting using sngrep, Wireshark, and SIPp • Kubernetes in production • Infrastructure as code using Terraform or similar • English proficiency, written and spoken, as the working language • Calm during incidents and able to identify and document root causes • Ownership of reliability issues through resolution • AWS networking, multi-region or multi-provider setups, RTPengine, FreeSWITCH, Asterisk, LiveKit, WebRTC, carrier interconnects, number porting, and Python or Go are nice to have

🏖️ Benefits

• Flexible work setup: work fully remotely or from a co-working space • Company laptop and phone provided • Small, agile, collaborative team environment • Growth opportunities and ownership of the call path from carrier to AI agent • Permanent employment • 40 hours/week

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