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Software Engineer II – Voice Client

Five9

$72,500 - $168,300
Oct 14, 2025
Remote, US
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Five9 is seeking a Software Engineer II to help build and enhance the voice solutions that power their industry-leading contact center platform, bringing joy to customer experience.

Requirements

  • 5+ years of industry experience in software development and troubleshooting VOIP systems.
  • Great understanding on WebRTC in browser and/or SIP signalling.
  • Proficient and expert in JavaScript. Additionally have a minimum of two years of practical experience in the second language between C++ and Java.
  • Experience in troubleshooting tools, audio media analysis and good debugging skills.
  • Experience working on complex problems and systems.
  • Experience working within an Agile/Scrum team.
  • Good understanding of VOIP protocols like SIP, RTP, RTCP and other network protocols.

Responsibilities

  • Be part of an agile team to develop a scalable, highly available global voice platform.
  • Understand performance and scalability principles and apply when developing software.
  • Collaborate with Product Managers, Architects, Engineering leaders and test engineers.
  • Mentor and train junior team members.

Other

  • Bachelor’s degree (or equivalent /above) in relevant discipline.
  • Positive, self-motivated and enthusiastic attitude with a strong-sense of ownership.
  • Strong communication skills, both verbal and written.
  • Work Location: This role is fully remote for candidates who reside outside the 50 mile radius of our San Ramon office.
  • 3 days a week (M, W, TH) in our San Ramon office for candidates who reside within 50 miles of our San Ramon location.