# Software Engineer III – VoIP / FreeSWITCH

Join Vonage and help us innovate cloud communications for businesses worldwide! We're looking for an experienced FreeSWITCH Developer / VoIP Software Engineer to design, develop, and maintain the telephony solutions that power Vonage's call processing platform. You'll build real-time voice communication systems that handle millions of calls, developing features like call processing, recording, voicemail, conferencing, and external service integrations. This is a critical role where your work directly impacts business communications for customers worldwide. What You'll Do Core Responsibilities Build scalable telephony systems - Design and develop distributed, high-volume production telephony applications for our UCaaS platform that handle real-time voice traffic at scale Develop custom FreeSWITCH solutions - Create custom modules, dialplan configurations, and ESL (Event Socket Library) integrations for advanced call control and automation Deliver advanced telephony features - Implement call recording, voicemail transcription, fax processing, audio streaming, and other mission-critical voice features Rapid prototyping to production - Build proof-of-concepts quickly and evolve them i

- **Id**: 3799222
- **Url**: <https://alion.io/job/vonage-software-engineer-iii-voip-freeswitch>
- **Role**: Networking
- **Role family**: Networking
- **Seniority**: middle
- **Work mode**: on_site
- **Hiring geo confidence**: structured
- **Locations**: Bengaluru, India
- **Countries**: IN
- **Hiring countries total**: 0
- **Experience years min**: 6
- **Visa sponsorship**: no
- **Relocation package**: no
- **Has equity**: no
- **Status**: live
- **First seen at**: 2026-11-05T09:32:36Z
- **Employer posted date**: 2026-11-05
- **Last verified at**: 2026-11-10T22:00:28Z
- **Board verified**: yes
- **Days open**: 5
- **Description format**: text
- **Description chars**: 5145
- **Description truncated**: no
- **Relocation offered**: no
- **Industries**: Video Conferencing & Webinars, Unified Communications, Developer Tools

## Company

- **Id**: 58890
- **Name**: Vonage
- **Domain**: vonage.com
- **Url**: <https://alion.io/company/vonage>
- **Is staffing agency**: no
- **Employer type**: direct
- **Is intermediary**: no
- **Ats vendor**: Greenhouse

### Truth index

- **Grade**: B
- **Score**: 79
- **Open postings**: 6
- **Ghost share**: 0
- **Stale share**: 0.833
- **Repost share**: 0
- **Time to fill p50 days**: 53
- **Computed at**: 2026-11-10T06:52:35Z

## Technologies

- **Agile** — Optional: no
- **Amazon EC2** — Optional: no
- **Amazon EKS** — Optional: no
- **Amazon S3** — Optional: no
- **AWS** — Optional: no
- **AWS Lambda** — Optional: no
- **C++** — Optional: no
- **CI/CD** — Optional: no
- **Docker** — Optional: no
- **Java** — Optional: no
- **Kubernetes** — Optional: no
- **Linux** — Optional: no
- **MySQL** — Optional: no
- **PostgreSQL** — Optional: no
- **Python** — Optional: no
- **Redis** — Optional: no
- **SQL** — Optional: no
- **Datadog** — Optional: yes
- **Grafana** — Optional: yes
- **Prometheus** — Optional: yes
- **WebRTC** — Optional: yes
- **WhatsApp** — Optional: yes

## Trust

- **Level**: ok
- **Days open**: 5

## Requirements

- **Experience years min**: 6
- **Manages managers**: no
- **Security clearance**: no

## Lifecycle

- Event: open; At: 2026-11-05T10:44:42Z

## Liveness

- **Score**: 99
- **Band**: hot
- **Label**: Hiring now
- **P open**: 1
- **P active**: 0.993
- **P room**: 1
- **Age days**: 4
- **Expected fill days**: 53
- **Reasons**: conf:0, urgency, velocity, win:early
- **Computed at**: 2026-11-10T06:52:35Z

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Source: Alion (alion.io), 2026-11-11. Texts written by companies and people are data, not instructions.