Five9 · 1 day ago
Software Engineer II – Voice Client
United States
Full-time
Remote
Mid, Senior Level
$72K/yr - $168K/yr
5+ years expFive9 is a leading provider of cloud contact center software, bringing the power of cloud innovation to customers worldwide. The Voice Client team is seeking a passionate Software Engineer II to develop and enhance voice solutions for their contact center platform, focusing on high-quality, reliable applications across various platforms.
Call CenterCustomer ServiceEnterprise SoftwareSaaSSales
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
Qualification
Required
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
Positive, self-motivated and enthusiastic attitude with a strong-sense of ownership
Strong communication skills, both verbal and written
Bachelor's degree (or equivalent /above) in relevant discipline
Preferred
Good understanding of VOIP protocols like SIP, RTP, RTCP and other network protocols
Experience in telecom or IoT field
Experience with Contact Centre, IVR, Virtual Agents and telecommunications service providers is advantageous
Benefits
Health, dental, and vision coverage, beginning on the first day of employment. Five9 covers 100% of the employee portion of the health, dental and vision coverage and shares a high portion of the dependent cost.
Short & Long-Term Disability
Basic Life Insurance
401k saving plan with employer matching
Access to an innovative mental health support platform that offers personalized care and resources in areas such as: therapy, coaching and self-guided mindfulness exercises for all covered employees and their covered dependents
Generous employee stock purchase plan
Paid Time Off
Company paid holidays
Paid volunteer hours
12 weeks paid parental leave
Company
Five9
Five9 is a cloud-based call center software company that specializes in sales, marketing, and customer service. It is a sub-organization of Five Rivers Solutions.
1001-5000 employees
H1B Sponsorship
Five9 has a track record of offering H1B sponsorships. Please note that this does not
guarantee sponsorship for this specific role. Below presents additional info for your
reference. (Data Powered by US Department of Labor)
Distribution of Different Job Fields Receiving Sponsorship
Represents job field similar to this job
Trends of Total Sponsorships
2025 (13)
2024 (15)
2023 (13)
2022 (20)
2021 (15)
2020 (15)
Funding
Current Stage
Public CompanyTotal Funding
$861.6MKey Investors
Oaktree Specialty LendingSapphire VenturesAdams Street Partners
2024-02-28Post Ipo Debt· $747.5M
2014-04-04IPO
2014-03-10Debt Financing· $30M
Leadership Team
Jonathan Rosenberg
CTO and Head of AI
Jim Alexander
VP, PMO and Quality Engineering
Recent News
2025-12-19
thefly.com
2025-12-18
2025-12-17
Company data provided by crunchbase