Principal Software Engineer - Tax Technology

T-Mobile•Bellevue, WA

4d•$133,500 - $240,700•Onsite

About The Position

This role is essential for designing, implementing, and deploying scalable software solutions that meet customer requirements and support high availability environments. It involves collaborating with engineers to develop software components using technologies such as virtualization, microservices, software-defined networking, network functions virtualization, and big data platforms. The role requires applying judgment to resolve sophisticated technical issues and making recommendations for software architecture and design. Success is measured by the effectiveness of software solutions, technical leadership contributions, and the ability to influence technology decisions. The work impacts the organization by enabling sophisticated software capabilities that improve operational efficiency and customer experience. The Principal Software Engineer - Tax Technology serves as a senior technical resource responsible for driving software engineering execution across tax technology platforms and solutions. This role partners with architecture, product, tax, finance, security, infrastructure, and enterprise technology teams to deliver scalable, secure, and resilient software solutions that support tax calculation, compliance, reporting, and enterprise integrations. This role translates architectural direction into high-quality engineering outcomes while supporting modernization, automation, reliability, and operational excellence across the Tax Technology ecosystem. The role also helps advance engineering maturity by mentoring engineers, promoting consistent development practices, and identifying practical uses of AI-assisted engineering tools in alignment with enterprise governance, security, and compliance expectations. We are a team that encourages innovation and advocates an agile and open approach, truly working and playing in the Un-carrier way!

Requirements

Bachelor's Degree plus 7 years of related work experience OR Advanced degree with 5 years of related experience (Required)
Acceptable areas of study include Computer Science or Engineering (Required)
7-10 years Technical engineering experience. (Required)
Analytical Thinking (Required)
Analytics (Required)
Collaboration (Required)
Communication (Required)
Customer Service (Required)
Leadership (Required)
Software Development (Required)
Technical Writing (Required)
Enterprise application development, integration, and platform engineering.
Modern software development methodologies, DevOps practices, and software delivery lifecycle management.
Cloud platforms, distributed systems, and enterprise integration technologies.
Ability to mentor engineers and influence technical outcomes without direct authority.
Ability to operate effectively in ambiguous environments and drive clarity, alignment, and execution.
Ability to build partnerships across technical and business organizations.
At least 18 years of age
Legally authorized to work in the United States

Nice To Haves

Experience leading technical implementation efforts across complex enterprise software environments.
Experience mentoring engineers and influencing technical direction across multiple teams or initiatives.
Experience with indirect tax platforms such as Vertex O-Series, Vertex Edge, or similar tax technology solutions.
Experience supporting telecommunications, financial, compliance, or other highly regulated business environments.
Experience integrating enterprise platforms such as billing systems, ERP platforms, financial systems, and external service providers.
Experience with .NET Core/.NET, Angular, API development, and enterprise integration patterns.
Experience with SQL Server, AWS RDS, database design, and enterprise data integration.
Experience with cloud-native and hybrid deployments across AWS, Azure, Oracle Cloud, and on-premises environments.
Experience with containerization, orchestration platforms, CI/CD pipelines, automated testing, observability, or infrastructure automation.
Experience leveraging AI-assisted development tools or implementing AI-enabled business solutions.
Experience supporting application modernization, cloud adoption, platform consolidation, or legacy system rationalization.

Responsibilities

Drive engineering projects to deliver software solutions that meet technical requirements and quality standards.
Provide technical leadership by mentoring engineers and influencing technology and policy decisions across the organization.
Evaluate and apply technology strategies that align with business goals and system requirements.
Develop innovative software designs and improvements that improve existing systems and processes.
Produce clear technical documentation and architecture descriptions for internal and external partners.
Lead technical execution for Tax Technology initiatives supporting tax calculation, compliance, reporting, and related business processes.
Partner with architecture leadership to translate target-state architecture and design decisions into effective engineering solutions and implementation plans.
Design, build, and support backend services, APIs, integration layers, orchestration services, and supporting data platforms that enable end-to-end tax workflows.
Support integrations between tax platforms and enterprise applications, including billing systems, ERP platforms, exemption services, financial systems, and external service providers.
Ensure software solutions meet performance, scalability, availability, security, and maintainability requirements.
Promote reusable frameworks, engineering accelerators, automated testing, CI/CD, observability, reliability, and operational excellence practices.
Contribute technical expertise and recommendations supporting modernization initiatives, platform investments, delivery practices, and engineering standards.
Evaluate new technologies, including AI-assisted engineering capabilities, and recommend practical applications that align with business objectives and enterprise standards.
Communicate sophisticated technical concepts and recommendaoptimallytively to technical and non-technical stakeholders.
Also responsible for other duties/projects as assigned by business management as needed.