Senior Software Engineer

Porto - Portugal

Monthly Salary: Not Disclosed

Posted on: 13 hours ago

Vacancies: 1 Vacancy

Job Summary

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 Developer who combines deep technicalexpertisewith a passion for code quality mentorship and collaborative this role you will lead efforts to modernize and evolve our platform drive engineering best practices and work alongsideproductdesign and data teams to ship reliable software at scale.

You bring a proven track record 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& CodeModernization

Lead architectural decisions for migratingalegacysingle 8applicationintoan existing multitenant framework.
Championcleancode principles and drive technical roadmaps that reduce technical debt whilemaintainingdelivery 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.
Define and enforce coding standards naming conventions and architectural guidelines across the team.
Identify systemic quality issues through review patterns and proactively propose process improvements.
Act as atrustedtechnical reviewer for high-risk or cross-cutting changes before they reach production.

Cross-Functional Collaboration

Partner closelywith stakeholdersto translate business requirements intoaccuratetechnical estimates and clear implementation plans.
Collaborate with data engineers on warehouse integrations and backend data pipelines ensuring scalable and maintainable interfaces.
Work with DevOps and platform teams to define deployment patterns and promote infrastructure-as-code practices.
Facilitate cross-team alignment through clear written communication architectural decision records (ADRs) and documentation.

Quality Engineering & Testing with TDD

Apply test-driven development (TDD) as a core engineering discipline writing unit integration and contract tests before implementation.
Design andmaintaintest suites that give the team confidence to refactor and deployfrequently.
Championa shift-left testing culture by embedding quality practices into every stage of development not just QA cycles.
Ensure test coverage benchmarks are defined tracked and continuously improved.

Communication & Process Leadership

Lead sprint ceremonies including planning retrospectives and backlog grooming with clarity and accountability.
Produce high-quality technical documentation including runbooks API contracts and onboarding guides.
Surface blockers and dependencies early communicating status and risk proactively to stakeholders.
Contribute to a culture of psychological safety where candid constructive feedback is the norm.

Required Qualifications

5 years of professional software development experience with a focus .
.NETproficiency including Core Entity Framework Core and the runtime ecosystem.
Demonstrated experience modernizing legacy web applications refactoring re-architecting or re-platforming from oldermonolithic web applications to modern platform fabrics.
Solid understanding of CI/CD pipelines including pipeline design automated test gating artifact management and deployment strategies (blue/green canary rolling).
Clear understanding ofsingle-tenancyvs. multi-tenancy architecture patterns andthe trade-offs in security isolation scalability and cost.
Experience with test-driven development and a strong testing philosophy covering unit integration and end-to-end coverage.
Strong written and verbal communication skills; able to write clear technical documentation and lead design discussions.

Preferred Qualifications

Claude code Copilot or the leverage of any AI platform to increase production outputis astrongplus.
Experience with large-scale data warehousing solutions; GoogleBigQueryexperience is a strong plus.
Frontend experience with 3 componentarchitecture Composition API and state management patterns.
Familiarity with observability tooling such asOpenTelemetry Prometheus Datadog or similar.
Experience working in a platform or multi-product engineering environment.

Benefits:

Five9 Shares
Bonus Scheme
10% Flexi Benefit
Meal Allowance
Medical Insurance
Life Insurance
25 day Annual Leave Public Holidays

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: Five9 will never request that an applicant send money as a prerequisite for commencing employment with Five9.

Required Experience:

Senior IC

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 journ...