Senior VoIP Engineer (Remote)

About us !

We believe that professional telephony should be simple and intuitive !

How do we do that? By providing « state of the art » communication solutions to optimize your everyday business calls. 

Onoff is a fast-growing SaaS telecom company that provides communication solutions to businesses worldwide. We work hard to provide professionals with an easy-to-use cloud-based-communication system connected to your favorite tools.

Our team of 100 passionate people works from all around the world, with offices in Paris and Tallinn. We provide our employees an environment where they can grow & flourish along with the company. 

Job Description

We are looking for an experienced VoIP Engineer to join our small team. You are a great match to the team if you are proactive, well organized, with attention to detail, and able to meet deadlines person.

What you will be doing:

Setup & maintaining  and configuration of the Kamailio & FreeSwitch

  • Analysing & troubleshooting the SIP traffic
  • Responding to crashes and system failures
  • Enforcing policies around security, compliance, change control, etc

About you !

We expect you to have: 

  • Excellent knowledge of SIP stack
  • Excellent knowledge of FreeSWITCH or Asterisk platforms
  • Experience with working Kamailio/OpenSIPS, or similar
  • Basic programming knowledge, in languages such as Bash, Lua, Python
  • Basic knowledge of WebRTC


Nice to have

  • Good knowledge of SS7 protocol
  • Good knowledge of SMPP
  • Experience with system and network monitoring solutions
  • Experience with Docker


Recruitement process

  • Interview with Océane, our HR
  • Interview with Dylan, our Team Leader UK

Interested by the opportunity ?

To apply, please click on the link below and send us your CV by email.