Senior Telephony & Sip Systems Engineer (Remote) - Remote

Senior Telephony & Sip Systems Engineer (Remote) - Remote
Viseu
Viseu, Viseu District, Portugal

We're looking for a Senior Telephony & SIP Engineer to join a short‑term freelance project (3 months, fully remote) for a growing tech company building modern, reliable, time‑aligned voice systems.

What You'll Do

Design and maintain Vo
IP systems based on SIP/RTP/SRTP.

Work with Asterisk, Free
SWITCH, Open
SIPS or Kamailio.

Build media services in Go or Python (Fast
API).

Integrate call events and audio streams with Fast
API backends and Next. Js frontends.

Operate cloud infrastructure on AWS + Kubernetes (EKS) using Terraform.

Monitor and troubleshoot SIP traffic using Wireshark, sngrep, tcpdump.

Implement security best practices: TLS/SRTP, fraud prevention, SIP hardening.

Collaborate with teams on integrations with Twilio, Telnyx, Signal
Wire, CRMs, IVRs, etc.

Must‑Have Requirements

5+ years working with Vo
IP, SIP, RTP, media servers.

Hands‑on experience with Asterisk / Free
SWITCH.

Strong knowledge of networking (VLANs, Qo
S, VPN, DNS, NAT traversal, STUN/TURN/ICE).

Experience building media systems in Go or Python (Fast
API).

Solid Linux and scripting background (Bash/Python).

Experience with AWS, Kubernetes (EKS), Terraform.

Proficient using SIP diagnostics tools.

English: full professional proficiency.

Nice to Have

Vo
IP/SIP certifications, CCNA/CCNP, RHCE.

Web
RTC and UCaa
S experience.

High‑availability voice architectures.

Docker, Ansible, SBCs.

Why This Project

3‑month freelance engagement.

100% remote.

Modern infrastructure: AWS + EKS + Terraform.

High autonomy and direct production impact.

Technical challenges with media and latency systems.

#J-18808-Ljbffr