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Five9

Five9

San Ramon, California, United States of America

1K-5K Employees

Tech

Software Engineer II - Backend

Porto, Portugal (Hybrid)

Posted on Feb 11, 2026

Full TimeMid LevelHybridCore - Product Engineering

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. Our team is looking for an energetic Java Software Engineer who is passionate about creating high-performing, scalable, and resilient mission critical back-end services that are the foundation of Five9’s contact center platform.

As a member of the team you will take end-to-end ownership of a solution to deliver services enriching our Contact Center platform and applications. In this highly visible and influential role your work will build the foundation to support the efforts of multiple teams. Your work in building APIs will set the standard across the organization by eliminating inconsistencies and streamlining the efficiency of our core services.   Key Responsibilities: Be part of an agile team to develop scalable, highly available core platform services.

Participate and contribute to requirements analysis. Collaborate with product managers, architects, engineering leaders and test engineers. Understand performance and scalability principles and apply when developing software. Troubleshoot and support current platform in production. This position requires the ability to be part of on-call rotation, troubleshooting issues.   Requirements 3+ years of industry experience in server-side development and integrations. 3+ years of experience in Java.

Strong Computer Science fundamentals in design, data structures, problem solving. Experience with any public cloud platform and microservices is a plus. Deep knowledge and experience in building Spring Framework applications. Experience in implementing RESTful and RPC interfaces. Experience in applying design patterns and separating concerns in a distributed system.

Experience developing and deploying internet scale, distributed services. Experience working with SQL and NoSQL databases and caches. 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.   Benefits: Five9 Shares Bonus Scheme 10% Flexi Benefit Meal Allowance Medical Insurance Life Insurance  25 day Annual Leave + Public Holidays  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.

About Five9

Five9, Inc., together with its subsidiaries, provides cloud software for contact centers in the United States and internationally. The company offers virtual contact center cloud platform that delivers a suite of applications, which enables the breadth of contact center-related customer service, sales, and marketing functions.

Its solution enables its clients to manage these customer interactions across various channels, including voice, video, chat, email, website, social media, click-to-call,...

Job overview

Employment type

Full Time

Experience level

Mid Level

Work type

Hybrid

Department

Core - Product Engineering

Posted

on Feb 11, 2026

About

Job Link

www.five9.com

Financials

Type

public

Annual Revenue

$500M-$1B

Market Cap

$5B+

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