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.

About the Team

The

Voice Client Team

is responsible for delivering critical voice call capabilities for our customer call and contact centre solutions. Our focus is on providing high-quality audio and seamless communication experiences. The team develops

native applications for macOS and Windows

, along with

web-based applications

using the latest web technologies.



We work closely with our customers to understand their needs, quickly address concerns, and continuously enhance our products--ensuring exceptional customer experience and measurable business impact.

Role Purpose

The role is focused on identifying customer challenges, leveraging the

Five9 Voice Platform

, and delivering customer value through solution implementation and ongoing support. This position involves close collaboration with cross-functional teams and occasional direct interaction with customers.

Key Responsibilities

Work as part of an agile team to design and develop a

scalable, highly available global voice platform

. Apply

performance and scalability principles

in software development. Collaborate with

Product Managers, Architects, Engineering Leads

, and

QA Engineers

to deliver robust solutions. Mentor and guide junior developers to foster a culture of technical excellence. Participate in code reviews and contribute to continuous improvement initiatives.

Required Skills and Qualifications

5+ years

of experience in

software development

and

VOIP system troubleshooting

. Strong understanding of

WebRTC

(in browsers) and/or

SIP signalling

. Expertise in

JavaScript

, with at least

2 years of hands-on experience

in either

C++

or

Java

. Experience with

debugging, audio media analysis

, and use of

troubleshooting tools

. Proven experience in solving complex technical problems within distributed systems. Familiarity with

Agile/Scrum methodologies

. Strong ownership mindset, proactive attitude, and excellent communication skills.

Bachelor's degree

(or higher) in Computer Science, Engineering, or a related field.

Preferred / Desirable Skills

Understanding of

VOIP protocols

such as

SIP, RTP, RTCP

, and other network protocols. Experience in

Telecom

or

IoT

domains. Background in

Contact Centre, IVR, Virtual Agents

, or

Telecommunication Service Provider

environments.

Additional Information

This position requires

on-call availability

as part of the support rotation.

Key Stakeholders

Product Management Team Customer Support Team Engineering & QA Teams





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.