Synthflow AI is an enterprise AI agent platform that unifies customer operations across voice, chat, and messaging. Our agents handle routine interactions at scale so teams can focus on high-value work.
Over 20M hours of operations automated
60% more calls answered vs. non-AI operators
150M interactions handled, 99.99% uptime
Backed by Accel, Atlantic Labs, and Singular. Trusted by 1,000+ customers. Recognized as one of the most promising companies in Germany.
We’re looking for a hands-on VoIP Engineer to help build, maintain, and improve our telephony infrastructure, with a focus on Kamailio and RTPEngine. You’ll work on SIP routing, media handling, and production troubleshooting to keep our voice services reliable and performant.
This role is a good fit for someone with practical Kamailio and RTPEngine experience, working knowledge of FreeSWITCH, and strong Linux and SIP/RTP debugging skills.
Your Responsibilities
Deploy, configure, and maintain Kamailio and RTPEngine
Troubleshoot SIP signaling, RTP media, and call quality issues
Support FreeSWITCH services and Linux-based telephony infrastructure
Improve call routing, load balancing, failover, and monitoring
Manage configurations in Git and document operational changes
What We’re Looking For
Hands-on experience with Kamailio and RTPEngine
Strong SIP/RTP debugging skills using tools like sngrep, tcpdump, or Wireshark
Working knowledge of FreeSWITCH
Solid Linux administration and networking skills
Experience with Git and collaborative change management
Nice to have: GCP, Kubernetes, Python or Go, and Bash scripting
Founded in Berlin in 2023 by serial entrepreneurs Albert Astabatsyan, Hakob Astabatsyan, and Sassun Mirzakhan-Saky, Synthflow AI democratizes access to advanced voice AI with a no-code platform that lets enterprises easily create, deploy and scale natural-sounding, cost-effective voice agents tailored to their business needs.
Source: Synthflow AI job board (Deel).
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