Contacts

E-Mail is a preferred contact.
If you have ideas, job offers or product questions, feel free to contact.

For employers

My rate starts at $25/h, but the final one will depend on the task difficulty and urgency.
As I've already mentioned, experience and the software stack allow me to reduce development and implementation time (which leads to savings). In additional, it enables to build complete local systems where you're independent of any external services and its subscriptions.
All my VoIP solutions based on FreeSWITCH/Baresip/Kamailio, all these products quite familiar for me, especially FreeSWITCH. My acquaintance with FreeSWITCH began when I worked on ISP (see CV) and we were looking for something flexible and powerful instead of Asterisk.
As far as I remember, FreeSWITCH didn't even have a G729 codec at that time, so I had to write from scratch...
So, over the years I've deeply dug in its guts and able to implement projects of any complexity.

The short list of services:

• Designing solutions from scratch or based on existing ones

  - custom VoIP applications (Freeswitch, Baresip, emPBX) - communication and broadcasting services (VoIP, IM, DVBx, HLS/DASH etc),
  - interactive voice systems (call processing IVR, click-to-call, etc),
  - audio/video processing/analytics systems (TTS/SST, computer vision, identification, ...),
  - radio comminications and signal processing,
  - neural based solutions.
  

• Setup and integration

  - Deploing Freeswitch with required dependencies (DNS, Radius, LDAP, SBC [Kamailio], etc)
  - Deploing VoIP services: call-center, conferencing, etc (multi-tenant scenarios with involving hiloading)
  - integration with: Twilio, Google, AWS, OpenAI, Viber, etc
  

Dev stack:

• Java

  Backend: JavaSE, ActiveMQ / RabbitMQ, PostgreSQL / MySQL, Jetty/Tomcat, Nginx/Apache...
  Frontend: HTML, CSS, Javascript (jquery / qooxdoo), JSON-RPC, XML-RPC, SOAP, ...
  Desktop: Swing

• Perl

  Backend: Perl5, PostgreSQL / MySQL, Nginx/Apache or builtin Perl webserver...
  Frontend: HTML, CSS, Javascript (jquery / qooxdoo), JSON-RPC ...

• C

  Backend: libre, apr, wstk...
  Frontend: HTML, CSS, Javascript (jquery / qooxdoo), JSON-RPC ...

• VoIP development

  Freeswitch, Baresip, Kamailio, SIP, WebRTC

• Embedded development

  OS: OpwnWRT, FreeBSD, VxWorks, baremetal
  SoC: STM32, Allwinner
  Lang: Pure C, ASM

• ML development

  Frameworks: DL4J, DJL
  Auxiliary soft: OpenCV, ONNX, SOD, ...