Senior Software Engineer at Five9

<div class="content-intro"><p><img src="https://www.five9.com/sites/default/files/2025-02/five9-logo.svg" alt="" width="100" style="max-width: 100%;"></p> <p>Join us in bringing joy to customer experience. &nbsp;Five9 is a leading provider of cloud contact center software, bringing the power of cloud innovation to customers worldwide. &nbsp;&nbsp;</p> <p>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.&nbsp;</p></div><p><strong><span data-contrast="none"><span data-ccp-parastyle="heading 1">About the Role</span></span></strong><span data-ccp-props="{&quot;335559738&quot;:320,&quot;335559739&quot;:120}">&nbsp;</span></p> <p><span data-contrast="none">We are looking for a Senior .NET Developer who combines deep technical&nbsp;expertise&nbsp;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&nbsp;product,&nbsp;design, and data teams to ship reliable software at scale.</span></p> <p><span data-contrast="none">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.</span> <span data-ccp-props="{&quot;335559738&quot;:120}">&nbsp;</span></p> <p><span data-ccp-props="{&quot;335559738&quot;:80,&quot;335559739&quot;:80,&quot;335572079&quot;:1,&quot;335572080&quot;:0,&quot;335572081&quot;:13291988,&quot;469789806&quot;:&quot;single&quot;}">&nbsp;</span></p> <p><strong><span data-contrast="none"><span data-ccp-parastyle="heading 1">Core Responsibilities</span></span></strong><span data-ccp-props="{&quot;335559738&quot;:320,&quot;335559739&quot;:120}">&nbsp;</span></p> <p><strong><span data-contrast="none">Technical Leadership&nbsp;&amp; Code&nbsp;Modernization</span></strong><span data-ccp-props="{&quot;335559738&quot;:240,&quot;335559739&quot;:100}">&nbsp;</span></p> <ul> <li><span data-contrast="none">Lead architectural decisions for migrating&nbsp;a&nbsp;legacy&nbsp;single tenant&nbsp;.NET 8&nbsp;application&nbsp;into&nbsp;an existing multitenant framework.</span><span data-ccp-props="{&quot;335559739&quot;:80}">&nbsp;</span></li> <li><span data-contrast="none">Champion&nbsp;clean&nbsp;code principles and drive technical roadmaps that reduce technical debt while&nbsp;maintaining&nbsp;delivery velocity.</span><span data-ccp-props="{&quot;335559739&quot;:80}">&nbsp;</span></li> <li><span data-contrast="none">Evaluate and introduce tooling, libraries, and frameworks that improve developer experience and system reliability.</span><span data-ccp-props="{&quot;335559739&quot;:80}">&nbsp;</span></li> <li><span data-contrast="none">Mentor junior and mid-level engineers through pairing, design reviews, and structured knowledge-sharing sessions.</span><span data-ccp-props="{&quot;335559739&quot;:80}">&nbsp;</span></li> </ul> <p><span data-ccp-props="{&quot;335559738&quot;:80}">&nbsp;</span></p> <p><strong><span data-contrast="none">Code Review &amp; Quality Assurance</span></strong><span data-ccp-props="{&quot;335559738&quot;:240,&quot;335559739&quot;:100}">&nbsp;</span></p> <ul> <li><span data-contrast="none">Conduct constructive code reviews that uphold team standards and serve as teaching opportunities.</span><span data-ccp-props="{&quot;335559739&quot;:80}">&nbsp;</span></li> <li><span data-contrast="none">Define and enforce coding standards, naming conventions, and architectural guidelines across the team.</span><span data-ccp-props="{&quot;335559739&quot;:80}">&nbsp;</span></li> <li><span data-contrast="none">Identify systemic quality issues through review patterns and proactively propose process improvements.</span><span data-ccp-props="{&quot;335559739&quot;:80}">&nbsp;</span></li> <li><span data-contrast="none">Act as a&nbsp;trusted&nbsp;technical reviewer for high-risk or cross-cutting changes before they reach production.</span><span data-ccp-props="{&quot;335559739&quot;:80}">&nbsp;</span></li> </ul> <p><span data-ccp-props="{&quot;335559738&quot;:80}">&nbsp;</span></p> <p><strong><span data-contrast="none">Cross-Functional Collaboration</span></strong><span data-ccp-props="{&quot;335559738&quot;:240,&quot;335559739&quot;:100}">&nbsp;</span></p> <ul> <li><span data-contrast="none">Partner closely&nbsp;with stakeholders&nbsp;to translate business requirements into&nbsp;accurate&nbsp;technical estimates and clear implementation plans.</span><span data-ccp-props="{&quot;335559739&quot;:80}">&nbsp;</span></li> <li><span data-contrast="none">Collaborate with data engineers on warehouse integrations and backend data pipelines, ensuring scalable and maintainable interfaces.</span><span data-ccp-props="{&quot;335559739&quot;:80}">&nbsp;</span></li> <li><span data-contrast="none">Work with DevOps and platform teams to define deployment patterns and promote infrastructure-as-code practices.</span><span data-ccp-props="{&quot;335559739&quot;:80}">&nbsp;</span></li> <li><span data-contrast="none">Facilitate cross-team alignment through clear written communication, architectural decision records (ADRs), and documentation.</span><span data-ccp-props="{&quot;335559739&quot;:80}">&nbsp;</span></li> </ul> <p><span data-ccp-props="{&quot;335559738&quot;:80}">&nbsp;</span></p> <p><strong><span data-contrast="none">Quality Engineering &amp; Testing with TDD</span></strong><span data-ccp-props="{&quot;335559738&quot;:240,&quot;335559739&quot;:100}">&nbsp;</span></p> <ul> <li><span data-contrast="none">Apply test-driven development (TDD) as a core engineering discipline, writing unit, integration, and contract tests before implementation.</span><span data-ccp-props="{&quot;335559739&quot;:80}">&nbsp;</span></li> <li><span data-contrast="none">Design and&nbsp;maintain&nbsp;test suites that give the team confidence to refactor and deploy&nbsp;frequently.</span><span data-ccp-props="{&quot;335559739&quot;:80}">&nbsp;</span></li> <li><span data-contrast="none">Champion&nbsp;a shift-left testing culture by embedding quality practices into every stage of development, not just QA cycles.</span><span data-ccp-props="{&quot;335559739&quot;:80}">&nbsp;</span></li> <li><span data-contrast="none">Ensure test coverage benchmarks are defined, tracked, and continuously improved.</span><span data-ccp-props="{&quot;335559739&quot;:80}">&nbsp;</span></li> </ul> <p><span data-ccp-props="{&quot;335559738&quot;:80}">&nbsp;</span></p> <p><strong><span data-contrast="none">Communication &amp; Process Leadership</span></strong><span data-ccp-props="{&quot;335559738&quot;:240,&quot;335559739&quot;:100}">&nbsp;</span></p> <ul> <li><span data-contrast="none">Lead sprint ceremonies including planning, retrospectives, and backlog grooming with clarity and accountability.</span><span data-ccp-props="{&quot;335559739&quot;:80}">&nbsp;</span></li> <li><span data-contrast="none">Produce high-quality technical documentation including runbooks, API contracts, and onboarding guides.</span><span data-ccp-props="{&quot;335559739&quot;:80}">&nbsp;</span></li> <li><span data-contrast="none">Surface blockers and dependencies early, communicating status and risk proactively to stakeholders.</span><span data-ccp-props="{&quot;335559739&quot;:80}">&nbsp;</span></li> <li><span data-contrast="none">Contribute to a culture of psychological safety where candid, constructive feedback is the norm.</span><span data-ccp-props="{&quot;335559739&quot;:80}">&nbsp;</span></li> </ul> <p><span data-ccp-props="{&quot;335559738&quot;:120}">&nbsp;</span></p> <p><strong><span data-contrast="none"><span data-ccp-parastyle="heading 1">Required Qualifications</span></span></strong><span data-ccp-props="{&quot;335559738&quot;:320,&quot;335559739&quot;:120}">&nbsp;</span></p> <ul> <li><span data-contrast="none">5+ years of professional software development experience with a focus on .NET.</span><span data-ccp-props="{&quot;335559739&quot;:80}">&nbsp;</span></li> <li><span data-contrast="none">.NET&nbsp;proficiency, including ASP.NET Core, Entity Framework Core, and the modern .NET runtime ecosystem.</span><span data-ccp-props="{&quot;335559739&quot;:80}">&nbsp;</span></li> <li><span data-contrast="none">Demonstrated experience modernizing legacy web applications — refactoring, re-architecting, or re-platforming from older&nbsp;monolithic web applications to modern platform fabrics.</span><span data-ccp-props="{&quot;335559739&quot;:80}">&nbsp;</span></li> <li><span data-contrast="none">Solid understanding of CI/CD pipelines, including pipeline design, automated test gating, artifact management, and deployment strategies (blue/green, canary, rolling).</span><span data-ccp-props="{&quot;335559739&quot;:80}">&nbsp;</span></li> <li><span data-contrast="none">Clear understanding of&nbsp;single-tenancy&nbsp;vs. multi-tenancy architecture patterns and&nbsp;the trade-offs in security, isolation, scalability, and cost.</span><span data-ccp-props="{&quot;335559739&quot;:80}">&nbsp;</span></li> <li><span data-contrast="none">Experience with test-driven development and a strong testing philosophy covering unit, integration, and end-to-end coverage.</span><span data-ccp-props="{&quot;335559739&quot;:80}">&nbsp;</span></li> <li><span data-contrast="none">Strong written and verbal communication skills; able to write clear technical documentation and lead design discussions.</span><span data-ccp-props="{&quot;335559739&quot;:80}">&nbsp;</span></li> </ul> <p><span data-ccp-props="{&quot;335559738&quot;:120}">&nbsp;</span></p> <p><strong><span data-contrast="none"><span data-ccp-parastyle="heading 1">Preferred Qualifications</span></span></strong><span data-ccp-props="{&quot;335559738&quot;:320,&quot;335559739&quot;:120}">&nbsp;</span></p> <ul> <li><span data-contrast="none">Claude code, Copilot, or the leverage of any AI platform to increase production output&nbsp;is a&nbsp;strong&nbsp;plus.</span><span data-ccp-props="{&quot;335559739&quot;:80}">&nbsp;</span></li> <li><span data-contrast="none">Experience with large-scale data warehousing solutions; Google&nbsp;BigQuery&nbsp;experience is a strong plus.</span><span data-ccp-props="{&quot;335559739&quot;:80}">&nbsp;</span></li> <li><span data-contrast="none">Frontend experience with Vue.js 3 —&nbsp;component&nbsp;architecture, Composition API, and state management patterns.</span><span data-ccp-props="{&quot;335559739&quot;:80}">&nbsp;</span></li> <li><span data-contrast="none">Familiarity with observability tooling such as&nbsp;OpenTelemetry, Prometheus, Datadog, or similar.</span><span data-ccp-props="{&quot;335559739&quot;:80}">&nbsp;</span></li> <li><span data-contrast="none">Experience working in a platform or multi-product engineering environment.</span><span data-ccp-props="{&quot;335559739&quot;:80}">&nbsp;</span></li> </ul> <p>&nbsp;</p> <p><strong>Benefits:</strong></p> <ul> <li>Five9 Shares</li> <li>Bonus Scheme</li> <li>10% Flexi Benefit</li> <li>Meal Allowance</li> <li>Medical Insurance</li> <li>Life Insurance&nbsp;</li> <li>25 day Annual Leave + Public Holidays</li> </ul> <p>&nbsp;</p><div class="content-conclusion"><p><span data-contrast="auto">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.</span><span data-ccp-props="{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:240}">&nbsp;</span></p> <hr> <p><span data-ccp-props="{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:240}">View our privacy policy, including our privacy notice to California residents here:&nbsp;<a href="https://www.five9.com/pt-pt/legal" target="_blank">https://www.five9.com/pt-pt/legal</a>.&nbsp;&nbsp;<br></span></p> <p><span data-ccp-props="{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:240}">Note: Five9 will never request that an applicant send money as a prerequisite for commencing employment with Five9.</span></p></div>