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Five9

Senior Software Engineer

Five9

Senior Software Engineer on Digital Team designing scalable frontend solutions for Five9's cloud contact center software initiatives. Mentoring engineers and driving best practices in a team-first culture.

Posted 7/14/2026full-timePorto • 🇵🇹 PortugalSeniorWebsite

Core Competencies

Role fit
Core Competencies

Use this summary to align your resume positioning with the role.

Demonstrates expertise in Frontend Development with a strong focus on React and TypeScript, while ensuring adherence to Web Content Accessibility Guidelines (WCAG). Proven ability to mentor engineers, optimize user experiences, and collaborate effectively with design teams using tools like Figma.

Highest-signal resume keywords
ReactTypeScriptWeb Content Accessibility Guidelines (WCAG)Frontend Tooling (Vite, Codemod)Component Libraries

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills
Semantic HTMLCSS (SCSS)JavaScriptTesting (React Testing Library, Enzyme, Cypress, Chromatic)Component LibrariesDesign SystemsDesign Tokens
Soft Skills
Attention to DetailProblem-SolvingExcellent English CommunicationSelf-MotivatedOwnership-Driven
Tools & Technologies
Figma
Certifications & Qualifications
Bachelor’s Degree in Relevant Discipline

Tech Stack

Tools & technologies
CypressJavaScriptReactSCSSTypeScript

About the role

Key responsibilities & impact
  • Design, develop, and maintain frontend software solutions.
  • Focus on building scalable, reliable, and high-performance frontend applications.
  • Optimize user experiences, streamline workflows, and enhance productivity.
  • Develop, maintain, and advance applications and component library across Five9.
  • Conduct software design and development, testing and documentation.
  • Mentor other engineers and drive best practices across Five9.

Requirements

What you’ll need
  • 5+ years of post-internship experience with React and TypeScript.
  • Strong proficiency in semantic HTML, CSS (preferably SCSS), and JavaScript.
  • Experience with component libraries, design systems, and design tokens.
  • Have a keen-eye with attention to detail, and problem-solving skills.
  • Strong expertise in Web Content Accessibility Guidelines (WCAG).
  • Experience with frontend tooling and migration (preferably Vite and Codemod)
  • Experience with testing (e.g. React Testing Library, Enzyme, Cypress, Chromatic).
  • Experience working closely with designers using Figma.
  • Excellent English communication skills, both verbal and written, with a proactive approach to collaboration.
  • Self-motivated, enthusiastic, and ownership-driven, with a strong commitment to delivering solutions.
  • Bachelor’s degree (or equivalent) in relevant discipline.

Benefits

Comp & perks
  • Five9 Shares
  • Bonus Scheme
  • 10% Flexi Benefit
  • Meal Allowance
  • Medical Insurance
  • Life Insurance
  • 25 day Annual Leave + Public Holidays