Cloud & Telco Engineer (SIP / Reliability)

Location: Remote (Greece); candidates must be located in Greece.

Company

hirify.global GmbH is a Swiss startup building AI voice agents that handle business phone calls and web conversations through connected telephony and business tools.

What you will do

• Run and harden Kamailio-based SIP session border controllers, carrier and customer trunks, PBX integrations, TLS, and SRTP.
• Build redundancy, provider and zone failover, graceful draining, and releases that avoid dropped calls.
• Troubleshoot SIP and RTP issues including NAT traversal, codecs, DTMF, one-way audio, transfers, and re-INVITEs.
• Operate Kubernetes on AWS and European clouds using Argo CD, Helm, and Terraform.
• Maintain observability and incident-response practices with metrics, logs, traces, alerting, runbooks, and postmortems.
• Perform load testing, capacity planning, and edge cost optimization.

Requirements

• Several years of experience running production infrastructure where downtime is visible to customers, ideally in telecom, VoIP, or real-time media.
• Production SIP experience with trunks, registrations, REFER, re-INVITE, NAT traversal, RTP, codecs, and DTMF.
• Experience with routing logic in a SIP proxy such as Kamailio or OpenSIPS; GUI-only PBX administration is insufficient.
• Linux networking and packet-level troubleshooting experience with sngrep, Wireshark, and SIPp.
• Production Kubernetes experience and infrastructure as code using Terraform or a similar tool.
• English proficiency is essential in written and spoken communication; English is the working language for all positions.
• Calm incident response, root-cause analysis, written documentation, preference for reliable systems, and ownership through resolution.

Nice to have

• AWS networking including VPC, load balancers, and IAM, plus multi-region or multi-provider setups.
• Experience with RTPengine, FreeSWITCH, Asterisk, LiveKit, or WebRTC.
• Carrier interconnects and number porting in Greece or in the German-speaking markets served.
• Python or Go for tooling and automation.

Culture & Benefits

• Fully remote work or work from a coworking space.
• Company laptop and phone provided for all employees.
• Small, agile, collaborative team with direct impact from individual contributions.
• Opportunity to own the full call path from carrier to AI agent.