---
title: 'Software Engineer III – VoIP / FreeSWITCH at Vonage'
canonical: 'https://feeny.ai/job/software-engineer-iii-voip-freeswitch-vonage-bengaluru-vxnyjdd8xffs'
type: 'job'
last_seen: '2026-11-11'
---

# Software Engineer III – VoIP / FreeSWITCH at Vonage

- **Company:** Vonage
- **Location:** Bengaluru, India
- **Work type:** hybrid
- **Posted:** 2026-11-05
- **Last confirmed live:** 2026-11-11
- **Apply:** https://job-boards.greenhouse.io/vonage/jobs/8922289002

## Job description

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 into production-ready, maintainable code
- Drive technical innovation — Evaluate emerging telephony technologies and recommend architectural improvements that enhance our platform capabilities
- Mentor and lead — Guide team members on design patterns, best practices, and telephony architecture decisions

Day-to-Day Collaboration

- Participate in the full agile development lifecycle: sprint planning, design reviews, standups, and demos
- Respond promptly to production incidents affecting customers and business operations
- Work independently on end-to-end feature delivery while contributing to broader team goals
- Partner closely with Product Management, QA, and Operations teams to deliver cohesive solutions
- Communicate progress, blockers, and technical decisions clearly with engineering leadership

## What You'll Bring

Required Experience & Skills

Telephony & VoIP Expertise (Must-Have)

- 6+ years of software development experience
- 3+ years hands-on experience with telephony platforms: FreeSWITCH, Asterisk, or similar open-source PBX systems
- Deep understanding of:
- SIP (Session Initiation Protocol) and RTP protocols
- VoIP architecture and NAT traversal techniques (STUN, ICE, TURN)
- Audio codecs (G.711, Opus, etc.)
- Dialplan development and call flow design

Programming & Development

- Strong proficiency in Java, C/C++, Python, and SQL
- Experience with CI/CD pipelines and modern development workflows
- Infrastructure as Code practices
- Containerization with Docker and Kubernetes

Cloud & Infrastructure

- Hands-on experience with AWS services: EC2, EKS, Lambda, S3, SNS, SQS, CloudFront
- Linux systems expertise: performance tuning, networking, file systems
- Database experience with:
- Relational: MySQL, PostgreSQL
- NoSQL: Redis, MongoDB

Problem-Solving & Debugging

- Proven troubleshooting skills in complex, distributed production environments
- Systematic debugging approach for real-time communication systems
- Experience analyzing performance bottlenecks and system failures

## Nice to Have

- Experience with WebRTC
- Familiarity with Kamailio, OpenSIPS, or other SIP proxies
- Knowledge of PSTN interconnection and carrier integrations
- Previous UCaaS or CPaaS platform experience
- Contributions to open-source telephony projects
- Experience with monitoring and observability tools (Prometheus, Grafana, Datadog)

## Why This Role Matters

As a FreeSWITCH Developer at Vonage, you'll work on voice infrastructure that powers critical business communications globally. Your code will directly enable features that millions of users depend on daily, and you'll have the opportunity to shape the architecture of next-generation voice platforms.

Work Style

- Ownership mindset — Take features from concept to production
- Collaborative approach — Work across teams while driving your work independently
- Customer focus — Balance feature velocity with reliability and user experience
- Continuous improvement — Stay current with telephony trends and share knowledge with the team

## #LI-CK1

There’s no perfect candidate. You don't need all the preferred qualifications to make a valuable impact on our team. Our employees and customers come from diverse backgrounds, so if you're passionate about what you could achieve at Vonage, we'd love to hear from you.

To learn how we process your personal data during the recruitment process, please refer to our [Privacy Notice](https://www.vonage.com/legal/careers-privacy-notice/).

Who we are:

Vonage is a global cloud communications leader. And your talent will further help brands - such as Airbnb, Viber, WhatsApp, and Snapchat - accelerate their digital transformation through our fully programmable-based unified communications, contact center solutions, and communications APIs. Ready to innovate? Then join us today.

Note: The purpose of this profile is to provide a general summary of essential responsibilities for the position and is not meant as an exhaustive list. Assignments may differ for individuals within the same role based on business conditions, departmental need or geographic location.

## About Vonage

## Company Overview
- **One-liner**: Vonage provides a cloud-based communications platform offering unified communications, contact centers, and programmable APIs for businesses and developers.
- **Entity Type**: Private (Acquired by Ericsson in 2022)
- **Headquarters**: Holmdel, New Jersey, USA
- **Founded**: 2001
- **Founders**: Jeff Pulver, Craig Walker, and other co-founders

## Core Business
- **Primary industry**: Cloud communications, Unified Communications as a Service (UCaaS), Contact Center as a Service (CCaaS), Communications Platform as a Service (CPaaS)
- **Target customers**: B2B – enterprises, SMBs, developers
- **Mission statement**: Accelerate the world’s ability to connect

## Products & Services
- **[Vonage Communications Platform (VCP)]**: Fully programmable platform integrating Video, Voice, Chat, Messaging, and Verification into existing workflows.
- **[Vonage Business Communications]**: Cloud-based unified communications solution for businesses (phone, messaging, video meetings).
- **[Vonage Contact Center]**: AI-powered contact center solution for customer service and engagement.
- **[Vonage APIs]**: Developer-friendly APIs for voice, SMS, video, and verification (built on the same platform).

## Market Standing
- **Valuation/Market Cap**: Acquired by Ericsson for $6.2 billion in 2022. Current valuation not publicly disclosed (subsidiary).
- **Key Metrics**: 
  - Over 2,000 employees
  - Over 1.6 million registered developers
  - 236 US patents (71 patents in other countries)
  - 25 billion minutes and messages terminated yearly
  - Serves over 100,000 businesses worldwide (source: [vonage.com](https://www.vonage.com/about-us/))
- **Notable Investors/Partners**: Parent company – Ericsson; integration with Ericsson’s network APIs and 5G strategy.
- **Growth Signals**: Continued expansion of programmable communications portfolio; growing developer community (1.6M+ registered); global office presence in US, Europe, and Asia.

## Competitive Advantages
- **Only provider combining UCaaS, CCaaS, and CPaaS on a single, fully programmable platform** – unmatched flexibility for customers to choose applications, APIs, or both.
- **Strong developer ecosystem** with over 1.6 million registered developers and extensive API documentation.
- **Patented technology** and deep expertise in real-time communications (Voice, Video, Messaging).
- **Global reach** with offices across US, Europe, and Asia and a hybrid/remote workforce.

## Strategic Focus
- Integration with Ericsson’s 5G and network API strategy to enable next-generation communications.
- Continued innovation in AI-powered contact centers, conversational experiences, and cloud-native communications.
- Expanding self-service capabilities and developer tools to accelerate time-to-market for enterprise customers.

## Why Work Here
- **Hybrid & remote-first culture**: “The majority of our roles are flexible… powered by our own Vonage solutions” (source: [vonage.com/careers](https://www.vonage.com/careers/)). Core office hubs available globally.
- **Award-winning culture** (“The Vonage Way”) built on values: Accountability, Collaboration, Trust, Excellence.
- **Strong DE&I commitment**: Employee Resource Groups (e.g., Women of Vonage, V+ Pride, The Black Experience, Wellness & Mental Health); inclusive hiring and development practices.
- **Benefits**: Medical/Dental/Vision, Health Savings Account, tuition reimbursement, paid time off, maternity/paternity leave, auto/home/pet insurance, retirement plan, legal plan, and paid volunteering days.
- **Learning & development**: Enriching opportunities to grow in career; encouragement of diverse perspectives.
- **Global community**: Over 2,000 employees across 16+ countries with a focus on collaboration and innovation.

## Sources
1. [vonage.com - About Us](https://www.vonage.com/about-us/)
2. [vonage.com - Life at Vonage](https://www.vonage.com/careers/life-at-vonage/)
3. [vonage.com - Careers](https://www.vonage.com/careers/)
4. [vonage.com - Homepage](https://www.vonage.com/)
5. [job-boards.greenhouse.io - Vonage Jobs](https://job-boards.greenhouse.io/vonage)

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