Cloud & Telco Engineer – SIP, Reliability

This is a fully remote position, open to applicants in Greece.

📋 Description

• Operate and secure the SIP edge, employing Kamailio-based session border controllers, carrier and customer SIP trunks, PBX integrations, as well as TLS and SRTP.

• Establish redundancy and failover mechanisms between different zones and providers.

• Execute graceful draining and releases without interrupting ongoing calls.

• Diagnose SIP and RTP call quality challenges, addressing issues such as NAT traversal, codecs, DTMF, one-way audio, transfers, and re-INVITEs.

• Manage Kubernetes deployments on AWS and European clouds utilizing GitOps, Argo CD, Helm, and Terraform.

• Oversee observability and incident response through metrics, logs, traces, alerting, runbooks, and postmortems.

• Carry out load testing and capacity planning.

• Control costs at the edge.

• Take ownership of reliability challenges across the telco edge and cloud infrastructure supporting live calls.

⛳️ Requirements

• Several years of experience managing production infrastructure where downtime is noticeable to customers, preferably in telecom, VoIP, or real-time media.

• Proficient in production SIP: trunks, registrations, REFER, re-INVITE, NAT traversal, RTP, codecs, and DTMF.

• Familiarity with SIP proxy routing logic, such as Kamailio or OpenSIPS; experience with GUI-only PBX administration is inadequate.

• Expertise in Linux networking and packet-level troubleshooting using tools like sngrep, Wireshark, and SIPp.

• Experience with Kubernetes in a production environment.

• Knowledge of infrastructure as code, utilizing Terraform or similar tools.

• Proficiency in English, both written and spoken, as it is the working language.

• Ability to maintain composure during incidents and effectively identify and document root causes.

• Demonstrated ownership of reliability issues through to resolution.

• Familiarity with AWS networking, multi-region or multi-provider setups, RTPengine, FreeSWITCH, Asterisk, LiveKit, WebRTC, carrier interconnects, number porting, and proficiency in Python or Go is advantageous.

🏝️ Benefits

• Flexible work arrangement: option to work fully remotely or from a co-working space.

• Company laptop and phone provided.

• Small, agile, and collaborative team environment.

• Opportunities for growth and ownership of the call path from carrier to AI agent.

• Permanent employment.

• 40 hours/week.