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Senior Software Engineer - Backend | Cloud

at Five9

Porto, Portugal (Hybrid), Portugal

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 and experienced Senior 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 expert knowledge of building APIs will set the standard across the organisation 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 and architecture.
  • Collaborate with product managers, architects, engineering leaders and test engineers.
  • Understand performance and scalability principles and apply when developing software.
  • Document and communicate clearly architecture and implementation solutions.
  • Troubleshoot and support current platform in production.



  • 7+ years of industry experience in server-side development.
  • 3+ years of Java backend development.
  • Strong Computer Science fundamentals in design, data structures, algorithms, problem solving and complexity analysis.
  • Experience in designing and implementing RESTful and RPC interfaces.
  • Experience in applying design patterns and separating concerns in a distributed system.
  • Experience architecting, developing and deploying internet scale, distributed and mission critical services.
  • Strong understanding of event-driven systems.
  • Deep knowledge and experience in building Spring Framework applications.
  • 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.
  • Experience with any public cloud platform is a plus.


  • Five9 Shares
  • Bonus Scheme
  • 10% Flex Benefits
  • Meal Allowance
  • Medical Insurance
  • Life Insurance
  • 25 day Annual Leave + Public Holidays
#LI-RM1 #LI-Hybrid

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. 

Our headquarters are located in the San Francisco Bay Area with global hubs in the United Kingdom, Germany, Philippines, Portugal, and Australia. 

View our privacy policy, including our privacy notice to California residents here:  

Note: Five9 will never request that an applicant send money as a prerequisite for commencing employment with Five9.


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