.NET Developer II

Remote US
USD 97k - 182k
CSS HTML Kubernetes API .NET SQL C# JavaScript Docker Vue.js AWS GCP PostgreSQL Git Azure
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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. 

We are actively looking for a .NET Developer II, where this person will responsible for the overall design and delivery of assigned projects and initiatives, which include data integration design and architecture, configuration, documentation, initial deployment, and unit testing across a wide variety of solutions with cloud deployment in mind. This role is on a wider team charged with delivering quality solutions to internal and external stakeholders through effective roadmap, design, construction, and post-implementation analysis to ensure that requirements are fulfilled. This role works closely with more senior developers, while expanding into more critical areas with greater responsibility. This position is open to qualified applicants nationwide. Candidates residing within 50 miles of our San Ramon, CA or San Francisco, CA offices are required to be in the office three days a week (Mondays, Wednesdays, Thursdays).


  • Create and read queries through MS SQL server and/or PostgreSQL.
  • Developing solutions required for B2B and B2C integration projects including web, windows services, client/server, and containerized applications.
  • Successful delivery of end-to-end components and end solutions may include the following components: business requirements, design specifications, functional specifications, development, testing, deployment.
  • Effectively work with other functional parts of the organization.
  • Ability to perform architecture and design and technical specifications.
  • Document all developed solutions to transfer knowledge to others including but not limited to design, code, testing plans and user acceptance criteria, assuring the overall technical quality of the solution.
  • Ability to communicate quickly and effectively with team members on design concerns, functionality specifications, bottlenecks, and development status updates.
  • Additional duties as they arise.

Required Skills:

  • 3-5 years of experience in environment designing and delivering technical projects.
  • 3-5 years of experience developing applications using .NET (C#).
  • 3-5 years ICM/IPCC/UCCE (Avaya, Cisco, Five9) or other relevant contact center/WFM/CTI experience (as role requires).
  • 1-3 years of experience developing applications using .NET Core.
  • .NET 6.0 or higher frameworks, C#, JavaScript, CSS, HTML, JSON.
  • Bitbucket, Gitlab or similar git source code management tools.
  • Solid understanding of microservice architectures with experience designing software with these architectures in mind.
  • Docker and/or Kubernetes experience. Kubernetes preferred.
  • Any experience in modernizing software devops from monolithic manual deployments towards microservice-based CI/CD deployments is a bonus.
  • Working knowledge of .NET Core, VUE, Entity Framework, T-SQL, multi-threading, usability and/or 3rd party APIs.
  • Expertise within the .NET Framework is important as well as full exposure to the software development life cycle.
  • Performance tuning knowledge.
  • Expertise with Visual Studio (2019, 2022) and/or Visual Code.
  • Working knowledge and experience with Fiddler, Insomnia, Postman or similar API testing tool.
  • Solid experience with MS SQL and/or PostgreSQL.
  • Experience with cloud provider services (AWS, GCP, and/or Azure cloud). GCP preferred.
  • GCP BigQuery exposure is a bonus.
  • The individual must have a thorough understanding of multi-tiered server applications including service-oriented systems using .NET WCF and SOAP.
  • Client application development for both web and desktop including interaction design, multi-threading/asynchronous server communication, and usability testing.
  • Comfortable with Microsoft Office products.
  • Expertise with communication transport layers and the concepts behind them.
  • Bachelor’s Degree or comparable work-related experience.



As part of our continued commitment to diversity, equity, and inclusion, Five9 supports pay transparency during the entire recruitment process.  Actual compensation packages are based on several factors that are unique to each candidate including, but not limited to: skill set, depth of experience, certifications, and specific work location. The range displayed reflects the minimum and maximum target for new hire salaries for the job across the United States. Your recruiter can share more about the specific compensation package during your hiring process.

Additionally, the total compensation package for this position may also include an annual performance bonus, stock, and/or other applicable incentive compensation plans.

Our total reward package also includes:

  • Health, dental, and vision coverage, beginning on the first day of employment. Five9 covers 100% of the employee portion of the health, dental and vision coverage and shares a high portion of the dependent cost. We also offer Short & Long-Term Disability, Basic Life Insurance, and a 401k saving plan with employer matching.
  • Access to an innovative mental health support platform that offers personalized care and resources in areas such as: therapy, coaching and self-guided mindfulness exercises for all covered employees and their covered dependents.
  • Generous employee stock purchase plan.
  • Paid Time Off, Company paid holidays, paid volunteer hours and 12 weeks paid parental leave.

All compensation and benefits are subject to the requirements and restrictions set forth in the applicable plan documents and any written agreements between the parties.

The US base salary range for this role is below.
$97,600$182,700 USD

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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