Job Description

Job Title:

Telecom Development Engineer - FreeSWITCH & Kazoo

Department:

Engineering / VoIP Platform

Location:

On-Site Delhi

Employment Type:

Full-time

Experience Level:

5+ years in VoIP/Telecom Development

Role Summary:

We are seeking a highly skilled

Telecom Development Engineer

with hands-on experience in

FreeSWITCH

and

Kazoo

, alongside strong programming skills in

Go

,

Python

, and familiarity with

Cloud Databases

,

RabbitMQ

,

REST APIs

,

Ansible

,

Prometheus

,

Grafana

, and

Git

The ideal candidate will be responsible for developing and maintaining VoIP applications and modules in FreeSWITCH and integrating them into the Kazoo multi-tenant telephony platform using Monster UI.

Key Responsibilities:

Design and Develop Custom FreeSWITCH Modules:

Create scalable, high-performance modules and dialplans in FreeSWITCH using Lua, Go, or C. Work with ESL (Event Socket Library) and mod_xml_curl to extend call handling logic

Kazoo Integration and Configuration:

Deploy FreeSWITCH modules and services into Kazoo via Monster UI and Kazoo APIs. Customize and extend Kazoo applications using Kazoo's AMQP and REST API interfaces.

Application Development:

Build automation tools and microservices using

Go

and

Python

to manage telecom workflows. Develop backend services that interface with SIP, RTP, and Kazoo/FreeSWITCH subsystems.

Infrastructure Automation & Monitoring:

Automate deployments with

Ansible

. Monitor system health using

Prometheus

and

Grafana

. Implement scalable logging, alerting, and system health-checks.

DevOps & Source Control:

Use

Git

for version control and CI/CD workflows. Collaborate on code reviews and participate in agile sprints.

API Integration:

Consume and expose RESTful APIs to support user interface functionality and backend logic. Integrate with third-party systems and internal services using RabbitMQ message queues.

Troubleshooting and Optimization:

Investigate and resolve SIP signaling issues, one-way audio, NAT traversal, and codec mismatches. Optimize RTP stream handling, failover, load balancing, and call quality.

Required Skills & Qualifications:

VoIP Expertise:

Deep understanding of

SIP, RTP, SDP, NAT

, and SIP tracing tools (e.g., sngrep, Wireshark). Experience building and maintaining VoIP platforms using

FreeSWITCH

and

Kazoo

.

Programming Languages:

Proficiency in

Go

(Golang) and

Python

. Familiarity with Lua scripting and C for FreeSWITCH module development.

Messaging & Databases:

Experience with

RabbitMQ

(AMQP) and

Cloud DBs

like CouchDB/Couchbase (used by Kazoo).

Infrastructure Tools:

Strong skills in

Ansible

,

Git

, and CI/CD pipelines. Proficient in

Prometheus

and

Grafana

for system observability.

Web & API Skills:

Proficient in designing and consuming

RESTful APIs

. Experience with Kazoo REST APIs and Monster UI for provisioning and monitoring.

Preferred Qualifications:

Experience working in

multi-tenant VoIP platforms

. Familiarity with

WebRTC

, STUN/TURN, and SBCs (Session Border Controllers). Previous contributions to open-source VoIP projects. Knowledge of

Docker

or containerization for telecom applications.

Key Attributes:

Strong problem-solving skills and ability to work independently. Excellent communication and documentation skills. Passion for scalable systems, performance optimization, and clean architecture. Collaborative mindset and proactive in a team environment.
Job Types: Full-time, Permanent

Pay: ?311,015.97 - ?900,000.00 per year

Benefits:

Cell phone reimbursement Internet reimbursement Paid time off
Work Location: In person

Expected Start Date: 11/08/2025