Senior Telephony/VoIP Engineer for TTNC

Dnipro, Kharkiv, Lviv, Kyiv, remote

Daxx is looking for a Senior Telephony/VoIP Engineer to join the TTNC development team in Dnipro/Kharkiv/Lviv/Kyiv/remote.

Project description:

TTNC is a multi-award-winning Communications Provider based in Chelmsford, Essex.

Founded in 2004, we provide Virtual Numbers, Call Management, Cloud PBX, SIP Trunks, SMS & Call Tracking Services to over 16,000 businesses that range from sole-traders and small businesses, through to large corporations and agencies.

TTNC started from a desire to put power and flexibility into the hands of the customer. We continue to put our customers first and ensure we provide a fair, honest service with no hidden surprises.


  • Leading the design and development of our telephony platform
  • Developing new features and enhancements to existing VoIP services
  • Responding to escalated support queries
  • Maintain our VoIP network
  • Monitor the network to ensure a high level of uptime
  • Monitor and analyse traffic usage pattern


  • 3+ years’ professional experience with FreeSWITCH 
  • 3+ years’ professional experience with an SBC (Kamailio/OpenSIPS) 
  • Experience working with FreeSWITCH’s ESL
  • Developing FreeSWITCH modules (ideally in LUA)
  • Protocols; SIP, RTP, SRTP, DNS
  • Debugging SIP applications with tools like Homer, tcpdump, wireshark, sngrep
  • Monitoring tools such as Centreon and Prometheus
  • Developing scripts in PHP
  • Databases (Mariadb, etcd, redis)
  • Git or similar version control
  • Good command of English

Will be a plus:

These skills would be nice to have but not essential.

  • Linux
  • Docker
  • Experience writing REST APIs
  • Firewalls and VPN

Daxx offers:

  • Direct cooperation with the customer
  • Dedicated HR / Client Manager
  • Competitive salary, medical insurance, 20 working vacation days
  • Regular corporate events, team buildings, etc.
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Tatiana Gramma

Tatiana Gramma

Kyiv Recruiter

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