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Five9

Senior Software Engineer - Frontend

Portugal (Remote)
Level
Senior
Work type
Remote · Portugal only

Not stated in the posting: salary, visa.

Open. First seen 3 October 2026.

About the role

Five9's standard text

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.

Five9 has led the cloud revolution in contact centers, helping organisations transition from legacy premise-based solutions to the cloud. The cloud contact center market has become the hot space for innovation in real-time communications, and is the tip of the spear for the application of Artificial Intelligence, especially Generative AI and Large Language Models (LLM). Our innovative AI team is responsible for developing a suite of leading edge AI products built upon industry-leading AI tech from vendors like OpenAI, Google, and Amazon.

These products include enterprise voice and chatbots (think: ChatGPT for businesses), agent assistance, and conversation analytics. This team - the fastest growing at Five9 - is seeking a talented and experienced Senior Front End React/Redux Software Engineer. In this role, you will be part of the team that builds software that brings AI technologies to users.

Prior AI experience is not required - you will receive on-the-job experience for some of the hottest skills on the market. An ideal candidate for us is an experienced engineer who is passionate about building high performance web platforms and applications, a brilliant problem solver and a creative self-starter.

Key Responsibilities:

  • Implement UX designs by working with UX Designers on a day-to-day basis, using React/Redux based framework.
  • Build custom widgets for dashboards developed using Google Looker Studio plugins.
  • Be part of an agile team to develop a scalable, highly available application platform using modern PaaS platforms such as GCP.
  • Participate and contribute to requirements analysis and grooming.
  • Understand how to leverage PaaS components, such as CDN, noSQL databases when developing software in order to achieve scalability, reliability, and operability.
  • Document and communicate clearly architecture and implementation solutions.
  • Have ownership of your code in production, including on-call, troubleshooting.

Key Skills:

  • 5+ years software development experience.
  • React/Redux focus.
  • Highly proficient in JavaScript and TypeScript.
  • Experience in operational code ownership – on-call, troubleshooting, uptime
  • Experience in applying modern UI design patterns and separating concerns in a distributed system.
  • Must have experience working within an Agile/Scrum team.
  • Positive, self-motivated and enthusiastic attitude with a strong sense of ownership.
  • Strong pro-active communication skills, both verbal and written.
  • Experience in contact center software is a plus but not required.
  • Experience with custom widget development using Google Looker Studio is a plus but not required.

Workplace location: This role is fully remote for candidates who reside outside Porto, Maia, Matosinhos, Gondomar, Valongo e Vila Nova de Gaia. Candidates who reside within those municipalities would be required to work in-office 3 days a week.

Benefits:

  • Five9 Shares
  • Bonus Scheme
  • 10% Flexi Benefit
  • Meal Allowance
  • Medical Insurance
  • Life Insurance
  • 25 day Annual Leave + Public Holidays
Five9's standard text

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.

Five9 is committed to providing reasonable accommodations for qualified individuals with disabilities throughout the application and interview process. If you need assistance or an accommodation due to a disability, please contact us at accommodations@five9.com to request an accommodation. Requests will be handled confidentially and in accordance with applicable law.

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.

What this role asks for

Standard for frontend roles

JavaScript · React · TypeScript

Common in frontend postings at any company.

71% of this description is written for the role. The rest is Five9's standard text, folded away below.

Read against Five9's other open postings on this site.

The team: AI Automation & Architecture

This role is one of 7 open in AI Automation & Architecture.

WHAT THE TEAM WORKS WITH, ACROSS ITS POSTINGS

GCP (6 of 7), Java (5 of 7), LLM (4 of 7), Microservices (4 of 7), NoSQL (4 of 7), Agile (3 of 7), Azure (3 of 7)

OTHER ROLES ON THIS TEAM

From the team and dates on Five9's own job board.

Salary context

6 other open postings titled Senior Software Engineer - Frontend state a salary: median USD 165,000 to USD 240,000 a year.

See Software Engineer salaries in Remote →

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