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VoIP & Telecom · India
FS

Hire FreeSWITCH Developers

FreeSWITCH specialists with deep telecom expertise. Class 4 and Class 5 softswitch, IVR, dialplans, ESL apps, custom modules in C.

Hire a FreeSWITCH Developer → See All 22 Roles
Skill Set

What our FreeSWITCH Developers know cold

Every engineer you hire from RG INSYS is benchmarked on these areas before they touch your codebase.

FreeSWITCH Core

  • FreeSWITCH 1.10 / 1.12 LTS
  • Dialplans (XML, mod_dptools)
  • ESL (Event Socket Library)
  • mod_xml_curl, mod_lua, mod_perl

Telephony

  • SIP signalling and SDP negotiation
  • RTP, SRTP, RTCP, codec selection (Opus, G.711, G.729)
  • T.38 fax, DTMF, MOH
  • WebRTC <-> SIP gateway

Architecture

  • Class 4 and Class 5 softswitch design
  • High availability with mod_redis, RabbitMQ
  • FreeSWITCH on Docker and Kubernetes
  • CDR pipelines to PostgreSQL / ClickHouse

Custom Modules

  • FreeSWITCH C module development
  • Integration with billing, CRM, AI/STT
  • Mediaproxy / RTPProxy / RTPEngine
  • Performance tuning at carrier scale
What They Build

Real work delivered, not hypothetical

Sample Engagements

Recent FreeSWITCH Developer work at RG INSYS

Designed a FreeSWITCH softswitch handling 5,000 concurrent calls for a UK ITSP, with HA and zero downtime upgrades.
Built an AI voice bot pipeline connecting FreeSWITCH ESL to Whisper STT, GPT-4, and ElevenLabs TTS for a healthcare triage line.
Delivered a CRM integrated contact centre with screen pop and call disposition for a 200 seat operation.
Engagement Models

Three ways to hire your FreeSWITCH Developer

Switch models anytime. No long lock ins. 2 week trial available.

Hourly
From $40/hr

For short tasks, code reviews, urgent fixes, or proof of concepts.

  • Minimum 20 hours/week
  • Weekly time tracking and reporting
  • Cancel anytime with 1 week notice
Most Popular
Dedicated FreeSWITCH Developer
From $4,800/month

A full time FreeSWITCH Developer dedicated to you, embedded in your standups and tools.

  • 160 hours/month, fixed monthly cost
  • Direct Slack, Jira, GitHub access
  • Daily standups in your timezone
  • 2 week free trial available
Dedicated Team
From $9,500/month

FreeSWITCH Developer + supporting roles (frontend, backend, DevOps, QA) under one tech lead.

  • 2 to 8 engineers + tech lead included
  • Sprint planning every 2 weeks
  • Code reviews and CI/CD pipelines included
Why RG INSYS

A FreeSWITCH Developer who codes with AI from day one

Hiring a FreeSWITCH Developer from RG INSYS is different from a typical staffing engagement. Every engineer on our bench uses Claude Code, Cursor IDE, and GitHub Copilot daily. That is not a sales line, it is a hard requirement on day one of the contract.

For you that means three things. Faster shipping, the AI handles the boilerplate so the engineer focuses on architecture, edge cases, and your domain. Lower cost, you get senior India based engineers at the rate of UK or US juniors. Higher quality, AI generated tests run on every PR before human review, and our internal benchmarks show roughly 2.5× to 3× output uplift on production codebases.

If the engineer is not the right fit in the first 2 weeks you pay nothing for the trial period and we replace them at no cost. NDAs are signed before any disclosure and full IP is assigned to you, the code lives in your repos under your accounts.

FAQ

Common questions about hiring a FreeSWITCH Developer

How quickly can a FreeSWITCH Developer start?

Most FreeSWITCH Developer roles ship a 2 to 3 person shortlist within 48 hours of a signed NDA. The chosen engineer typically starts within 5 to 10 working days, depending on your interview pace.

What level of seniority do you provide?

Our default is mid to senior (4+ years of production experience). We also have principal engineers for architecture work and tech leads available on request, both at higher monthly rates.

Can the FreeSWITCH Developer work in our timezone?

Yes. Engineers commit to a flexible 8 hour day with at least 4 hours overlap with your team. UK, EU, US East/West, UAE, and Australia are all supported.

Do you replace the engineer if it's not a fit?

Yes. The first 2 weeks are a paid trial. If you decide not to continue, you pay nothing for the trial and we replace the engineer at no cost.

Who owns the IP and the code?

You do. Every engagement includes a full IP assignment clause and an NDA. The code lives in your repos, on your infrastructure, under your accounts. We do not retain copies after handover.

What happens if the engineer is on leave or sick?

Planned leave is communicated 2 weeks in advance and is covered by a backup engineer briefed by the primary. Unplanned sickness is handled the same way. You never pay for time the engineer isn't producing.

Free shortlist within 48 hours

Ready to hire your
FreeSWITCH Developer?

Tell us the role, stack, and timezone. We'll send a 2 to 3 person shortlist with CVs, GitHub, and rates within 48 hours. Free 2 week trial available.

Hire a FreeSWITCH Developer →

Typical response within 4 business hours · NDA on request before any disclosure

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