Five9 · 23 hours ago
Senior Full Stack Engineer
United States
Full-time
Remote
Mid, Senior Level
$90K/yr - $250K/yr
5+ years expFive9 is a leading provider of cloud contact center software, bringing the power of cloud innovation to customers worldwide. They are seeking a highly skilled Full Stack Software Engineer to join their engineering team and help build and scale Five9’s global voice platform, focusing on developing and enhancing mission-critical services and user experiences across backend and frontend systems.
Call CenterCustomer ServiceEnterprise SoftwareSaaSSales
Responsibilities
Be part of an agile team to develop a scalable, highly available global voice platform
Collaborate with Product Managers, Architects, Engineering leaders and Test Engineers Understand performance and scalability principles and apply them when developing software
Troubleshoot and support current platform in production (we embrace DevOps) Designs, develops, troubleshoots, debugs, and implements software code using JavaScript, Java, Spring, and related technologies
Write unit and functional tests, be able to document and communicate clearly
Qualification
Required
5+ years of industry experience in backend development (Java)
5+ years of industry experience in frontend development (JavaScript, TypeScript, React)
Deep knowledge and experience with frameworks such as Spring
Hands on experience in designing and implementing scalable, high performing Microservices providing REST APIs
Strong expertise in web development technologies, including HTML, CSS, and modern front-end frameworks
Experience working with cloud platforms such as GCP or AWS
Expertise in server-side technologies and databases (SQL or NoSQL)
Experience working on complex problems spanning multiple products 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
Preferred
Hands-on experience with Kubernetes for container orchestration
Knowledge of real-time communications (SIP, RTP, etc.)
Experience with Backbone
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