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Five9

Five9

San Ramon, California, United States of America

1K-5K Employees

Tech

Senior C++ Software Engineer - Global Voice

Porto, Portugal (Hybrid)

Posted on Feb 16, 2026

Full TimeSeniorHybridVoice & 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. Our global voice team is looking for a committed, experienced Senior Software Engineer who is passionate about creating high performing, scalable, and resilient mission critical services that are the foundation of Five9’s next generation contact center platform.

You will have the opportunity to combine what you already know with new learnings, crafting a bespoke solution that serves our customers and partners.   Responsibilities: Participate in an Agile scrum team which practices DevOps. Write clean and well-documented code and tests. Deliver your code as part of an overall solution running in the public cloud.   Required Skills: 5+ years professional experience in software development, with some being written in C and/or C++.

Hands-on experience writing software for real-time communications signaling and media protocols (SIP, RTP, etc.). Ability to methodically troubleshoot complex systems. Excellent communication and organization skills, and a sense of ownership.    Technical Skills: Modern C++ (C++17+), RTP/SIP, audio codecs, SIP/SDP, ASR/TTS integration, AI APIs, cloud platforms (AWS/Azure/GCP), CI/CD, containers, SRE principlesb   Benefits: Five9 Shares Bonus Scheme 10% Flexi Benefit Meal Allowance Medical Insurance Life Insurance  25 day Annual Leave + Public Holidays  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

Senior

Work type

Hybrid

Department

Voice & Infrastructure - Product Engineering

Posted

on Feb 16, 2026

About

Job Link

www.five9.com

Financials

Type

public

Annual Revenue

$500M-$1B

Market Cap

$5B+

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