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.

About the Role

We are actively looking for a Senior Software Engineer with experience working with Auth Systems, Security & Google Cloud Platform, to join our team. Five9 delivers market-leading up-time for its Contact Center application while constantly delivering new features and capabilities to highly demanding enterprise customers. This requires that Five9 continually enhances, updates and modernizes the Platform Services that the Contact Center Application runs on. This position requires excellent understanding of cloud software: how it's built, deployed, tested and managed.

Key Responsibilities

Contribute to the next generation of Five9’s modern SaaS platform enabling AI-driven customer engagement. Design and develop highly available, scalable, and reliable microservices infrastructure. Build and enhance Identity & Access Management (IAM) systems supporting OAuth, security tokens, SSO, federation, and customer/partner identities. Apply cloud and open-source technologies to solve complex platform challenges. Gain deep understanding of existing systems and contribute to architectural improvements. Troubleshoot production issues and provide operational support across the software stack. Collaborate with cross-functional engineering teams and drive technical excellence. Required Skills & Experience Strong expertise in Java, APIs, Spring Security, and Web Authentication. Hands-on experience with SSO, SAML, OAuth, Federation, IDP, and CI/CD for identity platforms. Ownership of production uptime, reliability, SLAs/SLOs, and incident response. Participation in 24/7 on-call rotation for identity-related systems. Experience in performance tuning microservices and database queries. Familiarity with distributed databases such as CockroachDB or Cassandra. Experience with cloud platforms (GCP preferred). Good to Have Experience with Okta IAM. Exposure to large-scale SaaS environments and platform modernization initiatives. 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.