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Five9

Five9

San Ramon, California, United States of America

1K-5K Employees

Tech

Software Engineer II - VoIP – Global Voice | India

India, Bengaluru

Posted on Mar 31, 2026

Full TimeMid LevelOn SiteVoice & Infrastructure - Product Engineering

Job Description

Join us in bringing joy to customer experience.  Five9 is a leading provider of cloud contact center software, bringing the power of cloud innovation to customers worldwide.    Living our values everyday results in our team-first culture and enables us to innovate, grow, and thrive while enjoying the journey together.

We celebrate diversity and foster an inclusive environment, empowering our employees to be their authentic selves.  Join us in bringing joy to customer experience. Five9 is a leading provider of cloud contact center software, bringing the power of cloud innovation to customers worldwide. Living our values every day results in our team-first culture and enables us to innovate, grow, and thrive while enjoying the journey together.

We celebrate diversity and foster an inclusive environment, empowering our employees to be their authentic selves. Position Overview Our Global Voice Team is looking for a committed, experienced VoIP Engineer who is passionate about creating high-performing, scalable, and resilient mission-critical services that are the foundation of Five9’s next-generation CCaaS voice platform.

As a member of the team, you will play a key role in shaping the architecture and future of our voice core solution.

Responsibilities

Participate in the design and definition of the Proxy Servers architecture for the CCaaS voice core solution Write clean, maintainable code and automated tests for the Proxy Servers Participate in an Agile Scrum team that practices DevOps Ensure services are scalable, resilient, and performant while running in the public cloud Required Skills 3+ years of professional experience in VoIP and software development Deep knowledge and hands-on experience with OpenSIPS or Kamailio open-source software Expert-level knowledge of real-time communications signaling and media protocols (SIP, RTP, etc.) Ability to methodically troubleshoot complex, distributed voice systems Excellent communication and organizational skills, with a strong sense of ownership Technical Skills OpenSIPS Kamailio SIP, RTP VoIP Proxy Servers CCaaS Cloud Platforms (AWS / Azure / GCP) CI/CD Containers SRE principles Scripting languages (Python, Bash, etc.) Go Five9 embraces diversity and is committed to building a team that represents a variety of backgrounds, perspectives, and skills.

The more inclusive we are, the better we are. Five9 is an equal opportunity employer.  View our privacy policy, including our privacy notice to California residents here: https://www.five9.com/pt-pt/legal.   Note: Five9 will never request that an applicant send money as a prerequisite for commencing employment with Five9.

About Five9

Five9, Inc., together with its subsidiaries, provides cloud software for contact centers in the United States and internationally. The company offers virtual contact center cloud platform that delivers a suite of applications, which enables the breadth of contact center-related customer service, sales, and marketing functions.

Its solution enables its clients to manage these customer interactions across various channels, including voice, video, chat, email, website, social media, click-to-call,...

Job overview

Employment type

Full Time

Experience level

Mid Level

Work type

On Site

Department

Voice & Infrastructure - Product Engineering

Posted

on Mar 31, 2026

About

Job Link

www.five9.com

Financials

Type

public

Annual Revenue

$500M-$1B

Market Cap

$5B+

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