Senior Software Engineer

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About this role

Senior Software Engineer Porto, Portugal (Hybrid) 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 looking for a Senior .NET Developer who combines deep technical expertise with a passion for code quality, mentorship, and collaborative delivery. In this role you will lead efforts to modernize and evolve our platform, drive engineering best practices, and work alongside product, design, and data teams to ship reliable software at scale. You bring a proven track record in .NET development, a sharp understanding of modern deployment pipelines, and the architectural awareness to build systems that scale across tenancy models and data workloads. Core Responsibilities Technical Leadership & Code Modernization - Lead architectural decisions for migrating a legacy single tenant .NET 8 application into an existing multitenant framework. - Champion clean code principles and drive technical roadmaps that reduce technical debt while maintaining delivery velocity. - Evaluate and introduce tooling, libraries, and frameworks that improve developer experience and system reliability. - Mentor junior and mid-level engineers through pairing, design reviews, and structured knowledge-sharing sessions. Code Review & Quality Assurance - Conduct constructive code reviews that uphold team standards and serve as teaching opportunities. -

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