Sr Software Engineer (.Net)

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 looking for a Full Stack .NET Developer with strong expertise in Microsoft technologies and modern front-end frameworks. The role involves building scalable, high-performance web applications using ASP.NET, .NET Core, Web API, SQL, Angular, React and AWS following best engineering practices.

Key Responsibilities

• Develop and maintain web applications using ASP.NET / .NET Core / Web API / SQL


• Build responsive Single Page Applications using Angular and React


• Design and consume RESTful APIs


• Implement microservices and micro-frontend architectures


• Write clean, maintainable, and testable code using SOLID principles and design patterns


• Having experience in AWS cloud stacks, CI/CD Pipelines


• Perform unit testing and support automated testing efforts


• Collaborating with cross-functional and remote teams


• Ensure application performance, security, and scalability

Required Skills & Experience

• 5+ years of experience with Microsoft Technology Stack (ASP.NET, MVC, Web API)


• Strong hands-on experience in React and Understanding of Angular framework for migration projects.


• Experience on cloud technologies and its concepts most preferred AWS.


• Proficiency in SPA architecture


• Strong knowledge of HTML5, CSS3, JavaScript, JSON, jQuery


• Experience with Relational Databases (MS SQL Server Preferred)


• Solid understanding of Data Structures, Design Patterns, and SOLID principles


• Knowledge of multithreading and performance monitoring


• Experience with Unit Testing frameworks


• Familiarity with Git or similar version control tools


• Strong analytical, communication, and problem-solving skills

Preferred Skills

• Experience with .NET Core, .Net Framework, React, Angular, AWS, MS SQL


• Knowledge of BDD/TDD and UI test automation


• Exposure to CI/CD and DevOps tools (Docker, YAML or similar)


• Experience with application security tools


• Strong UI/UX sensibility and attention to detail

Additional Information

• Ability to work independently and in a fast-paced environment


• Flexibility to collaborate across time zones when needed

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.