Senior C++ Software Engineer - Global Voice

five9· Voice & Infrastructure - Product Engineering
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📍 Porto, Portugal (Hybrid)

About this role

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 global voice team is looking for a committed, experienced Senior Software Engineer who is passionate about creating high performing, scalable, and resilient mission critical services that are the foundation of Five9’s next generation contact center platform. You will have the opportunity to combine what you already know with new learnings, crafting a bespoke solution that serves our customers and partners. Additionally, for candidates interested in leadership, this role offers an optional, supported pathway to transition into a future engineering management position.

 

Responsibilities:

  • Participate in an Agile scrum team which practices DevOps.
  • Write clean and well-documented code and tests.
  • Deliver your code as part of an overall solution running in the public cloud.
  • Develop and enhance our Media Server to support real-time integrations with Large Language Models (LLMs) and other AI services.
  • (Optional) For those pursuing the management track: Mentor team members, lead technical initiatives, and progressively take on team leadership responsibilities.

 

Required Skills:

  • 5+ years professional experience in software development, with some being written in C and/or C++.
  • Hands-on experience writing software for real-time communications signaling and media protocols (SIP, RTP, etc.).
  • Ability to methodically troubleshoot complex systems.
  • Excellent communication and organization skills, and a sense of ownership.

 

 Technical Skills:

  • Modern C++ (C++17+), RTP/SIP, audio codecs, SIP/SDP, ASR/TTS integration, AI APIs, cloud platforms (AWS/Azure/GCP), CI/CD, containers, SRE principles.

 

Preferred / Nice-to-Have Skills:

  • For the optional management track: Prior experience with technical leadership, a strategic mindset, and a strong desire to grow into an engineering manager role.

 

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.

Frequently Asked Questions

Is the salary disclosed for the Senior C++ Software Engineer - Global Voice position at five9?
The salary for this Senior C++ Software Engineer - Global Voice role at five9 is not publicly listed. Click "Apply Now" to learn more about the compensation package on their official careers page.
Where is the Senior C++ Software Engineer - Global Voice position at five9 located?
This Senior C++ Software Engineer - Global Voice role at five9 is based in Porto, Portugal (Hybrid). The position is listed as on-site or hybrid. Check the full job description or apply directly to confirm the work arrangement.
Which team or department does the Senior C++ Software Engineer - Global Voice at five9 belong to?
This Senior C++ Software Engineer - Global Voice position is part of the Voice & Infrastructure - Product Engineering department at five9. See the full job description for more information about the team structure and responsibilities.
How do I apply for the Senior C++ Software Engineer - Global Voice position at five9?
Click the "Apply Now" button on this page. You will be redirected to five9's official application portal hosted on greenhouse where you can submit your application directly.
When was the Senior C++ Software Engineer - Global Voice job at five9 posted?
This Senior C++ Software Engineer - Global Voice position at five9 was posted on Feb 16, 2026. Apply as soon as possible — early applications are often reviewed first.
Senior C++ Software Engineer - Global Voice
five9
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