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.

You’ll join a cross-functional team that owns the user experience for our global voice features. Working side-by-side with designers, product managers, and fellow engineers, you’ll turn product ideas and Figma mock-ups into polished user interfaces, servicing both internal operations teams and customers who rely on our platform.

What you’ll do

Build modern, responsive UIs in React, TypeScript, and JSX—focusing on performance, accessibility (WCAG).
Implement state management patterns (Redux Toolkit, Context, or equivalent) that keep complex data flows predictable and testable.
Collaborate with designers & PMs to translate wireframes into delightful user interactions, advocating for best-in-class UX.
Write clean, scalable code with thorough unit and component tests (Jest, React Testing Library).
Integrate with RESTful APIs securely using JWT/OAuth.
Optimize, profile, and debug across browsers and devices—measuring with Lighthouse, Web Vitals, and bespoke tooling.
Contribute to our design system and help push forward component reusability and theming.
Participate in agile ceremonies: sprint planning, peer reviews, and continuous delivery in GitLab CI/CD.

Nice-to-have full-stack skills
If you enjoy working across the stack, you’ll have opportunities to contribute to our Spring Boot services (Java 21)—but this is not a prerequisite.

What you bring

5+ years of professional front-end development experience, heavy on React + TypeScript.
Knowledge of modern CSS and responsive design principles.
Strong grasp of software design patterns, data structures, and clean-code best practices.
Experience consuming and designing RESTful APIs; comfort with tools like Postman/Insomnia.
Proven record of writing automated tests across the pyramid (unit → E2E).
Familiarity with accessibility standards, performance budgeting, and analytics instrumentation.
Excellent collaboration and communication skills in both Portuguese and English (spoken & written).

Bonus points (but not required):

Java / Spring Boot micro-services.
Experience with Cloud Platforms such as GCP/AWS.
Experience with CI/CD pipelines (GitLab, Jenkins).

Benefits:

Five9 Shares
Bonus Scheme
10% Flex 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.

Software Engineer II - Frontend - Voice

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