Senior Software Engineer - Fullstack

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Quick Summary

Key Responsibilities

Be part of an agile team to develop a scalable, highly available cloud contact center software using Java and single-page JavaScript. Collaborate with Product Managers, Architects,

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OtherSoftware EngineerSoftware Engineering

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. 

We are developing a next-generation solution focused on Salesforce integrations, including OpenCTI and Service Cloud Voice. The role involves building and maintaining Java-based backend microservices using gRPC and REST, along with JavaScript for Salesforce integrations. If you enjoy working on real-world integration challenges, writing clean and reliable code, and delivering high-quality user experiences, this role is for you. 
 
 
Key Responsibilities:
  • Be part of an agile team to develop a scalable, highly available cloud contact center software using Java and single-page JavaScript.
  • Collaborate with Product Managers, Architects, Engineering leaders and Test Engineers.
  • Deliver scalable software in both private cloud and public cloud settings (AWS and Google Cloud Platform).
  • Deliver using containers (docker, Kubernetes) using CI/CD in a DevOps model.
  • Bring a positive attitude to the team, helping mentor more junior engineers, drive our standards, show ownership and an obsession for our customers.

 

Required Skills:
  • 2+ years of professional experience developing Java applications – including delivering RESTful and gRPC apis. 
  • 5+ years of professional or open-source experience writing JavaScript MVC.
  • Agile coding experience, working in small teams making a big impact fast.
  • Familiarity with standard javascript async patterns (events, closures, callbacks, promises, error handling, etc.).
  • Strong CS fundamentals and an object oriented language (think an undergrad CS degree, or similar amount of work experience).
  • Positive, self-motivated and enthusiastic with a strong sense of ownership.
 
Appreciated Skills:
  • Experience with Salesforce integrations as OpenCTI and Service Cloud Voice.
  • Experience with Voice applications and/or SIP Protocols.
  • Experience with Contact Center or Call Center software.
  • 1+ years of professional or open-source experience with a JavaScript MVC toolkit such as React, Dojo, AngularJS, Backbone.js, Knockout or Ember.js.
  • 1+ years of experience delivering production software using Containers (Docker or similar).
  • 1+ years of experience delivering production software into Public Cloud.
  • Experience in a modern consumer environment (Pinterest, Box, Quora, Facebook...) and/or open source projects (contributed to node.js, dojo toolkit, NPM modules, etc).
  • Experience with GIT SCM.
  • Passion for user experience and strong design experience.
  • Experience with a data visualization package (Highcharts, d3.js, etc.).

 

What We Offer

~1 min read
Five9 Shares
Bonus Scheme
10% Flex Benefit
Meal Allowance
Medical Insurance
Life Insurance
25 day Annual Leave + Public Holidays

Listing Details

First seen
April 3, 2026
Last seen
April 26, 2026

Posting Health

Days active
23
Repost count
0
Trust Level
32%
Scored at
April 26, 2026

Signal breakdown

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Five9
Five9
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Five9 is a leading provider of cloud contact centre software.

Employees
3k+
Founded
2001
Domain
five9.com
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Five9Senior Software Engineer - Fullstack