Principal Engineer, Software - Billing

At T-Mobile, we invest in YOU!  Our Total Rewards Package ensures that employees get the same big love we give our customers.  All team members receive a competitive base salary and compensation package - this is Total Rewards. Employees enjoy multiple wealth-building opportunities through our annual stock grant, employee stock purchase plan, 401(k), and access to free, year-round money coaches. That’s how we’re UNSTOPPABLE for our employees!

T-Mobile is transforming from a traditional Telco to a next-generation TechCo—and our Billing organization is owning the charge. We are rebuilding our foundational systems to enable world-class experiences not only for today’s wireless services, but also for tomorrow’s technologies like 6G, IoT, and beyond. The Principal Software Engineer serves as a technical leader and strategist, guiding the design and evolution of enterprise-scale telecom billing and operational support systems. You will be responsible for defining architectural standards, leading modernization initiatives, and driving innovation across critical components of a high-availability BSS/OSS platform. Working closely with engineering, product, and operations teams, you will ensure that system solutions are robust, scalable, and aligned with long-term business goals. You’ll engage with both legacy and modern stacks—including C/C++, Java, Oracle PL/SQL, and Linux-based scripting—while mentoring senior engineers and influencing strategic technical decisions. This role requires a strong understanding of telecom domain challenges, a forward-looking mentality, and a dedication to perfection in system design and performance.

*** This position will sit in Frisco, TX, Bellevue, WA, Atlanta, GA, Overland Park, KS, Herndon, VA OR Denver, CO. This is not a remote role - this is a hybrid environment requiring 3 days a week in office.

Job Responsibilities:

• Define and architect scalable, high-performance solutions for telecom billing and OSS/BSS platforms, setting technical direction across development teams.

• Drive end-to-end system design for complex business logic involving rating, charging, invoicing, and customer management in high-availability environments.

• Establish coding and architectural standards for C/C++, Java, PL/SQL, and shell scripting implementations, balancing legacy needs with modern practices.

• Spearhead database performance strategies and enterprise-wide optimization initiatives across Oracle platforms.

• Lead all aspects of and coordinate integration of system modules, batch pipelines, and third-party OSS/BSS tools to deliver cohesive operational solutions.

• Lead critical incident reviews and implement long-term stability measures for production systems processing extensive data volumes.

• Champion modernization efforts, including re-architecture, legacy migration, and microservices enablement.

• Review, influence, and approve technical documentation, operational standards, and development workflows to ensure strategic alignment.

• Code Review and mentoring of other team members

• Designs / builds sophisticated scheduled jobs and micro-services defining new patterns and orchestrations

• Designs / implements advanced data storage mechanisms using relational and non-relational data stores

• Explores, creates and configures cloud services using infrastructure as code. Recommends new cloud services and patterns

• Presents new ideas which improve an existing system/process/service. Presents new ideas which apply new frameworks to improve an existing system/process/service

• Develop a culture of technical excellence through mentorship, cross-team collaboration, and continuous improvement processes.

• Awareness of technology roadmap. Updates job knowledge by tracking and understanding emerging engineering practices. Continuously learns, creates content, and guides others specific subject areas. Informally coaches and contributes to the development of others through mentoring or in house workshops and learning sessions. Mentor and develop engineers across functional teams on technology decisions. Influence technology and policy decisions made at Director+ level across organization. Understand financial decisions, including NPV and ROI, based on customer experience/business drivers.

• Also responsible for other Duties/Projects as assigned by business management as needed.

Education and Work Experience (Required):

• Bachelor's Degree Computer Science or Engineering

• 7+ years full stack web development experience including front end and back end

• 7+ years designing database schemas, writing SQL

• 3+ years DevOps experience with infrastructure as code

• 4+ years using cloud services from AWS, Azure or GCP

• 7+ years technical engineering experience

• 1+ years coaching and mentoring team members

Preferred Qualifications:

• Experience with Amdocs billing systems is preferred.

Knowledge, Skills and Abilities:

• Expected to be able to setup a completely new full stack environment from scratch including build steps and backend infrastructure

• Knowledge of html, css, webpack, JavaScript, at least one front end framework and one backend framework

• Understands web protocols, how full stack applications operate and data flows

• Understanding of database modeling and SQL. Capable of performance tuning and refactoring from one data store to another

• Deep understanding of cloud system parameters, configurations, and how to alter them for desired results

• Good understanding of adjacent processes and workflows

We pride ourselves on encouraging a culture of innovation, advocating for agile methodologies, and promoting transparency in all that we do. Join us in embodying the spirit of the 'Un-carrier' and make a tangible impact!

Our team is dynamic where no day is the same, and we are a diverse and inclusive team passionate about growth and innovation! If you're up to the challenge, apply today!

• At least 18 years of age
• Legally authorized to work in the United States

Travel:
Travel Required (Yes/No): Yes

DOT Regulated:
DOT Regulated Position (Yes/No): No
Safety Sensitive Position (Yes/No): No

Base Pay Range: $133,500 - $240,700

Corporate Bonus Target: 20%

The pay range above is the general base pay range for a successful candidate in the role. The successful candidate’s actual pay will be based on various factors, such as work location, qualifications, and experience, so the actual starting pay will vary within this range.

At T-Mobile, employees in regular, non-temporary roles are eligible for an annual bonus or periodic sales incentive or bonus, based on their role. Most Corporate employees are eligible for a year-end bonus based on company and/or individual performance and which is set at a percentage of the employee’s eligible earnings in the prior year. Certain positions in Customer Care are eligible for monthly bonuses based on individual and/or team performance. To find the pay range for this role based on hiring location, click here.

At T-Mobile, our benefits exemplify the spirit of One Team, Together! A big part of how we care for one another is working to ensure our benefits evolve to meet the needs of our team members. Full and part-time employees have access to the same benefits when eligible. We cover all of the bases, offering medical, dental and vision insurance, a flexible spending account, 401(k), employee stock grants, employee stock purchase plan, paid time off and up to 12 paid holidays - which total about 4 weeks for new full-time employees and about 2.5 weeks for new part-time employees annually - paid parental and family leave, family building benefits, back-up care, enhanced family support, childcare subsidy, tuition assistance, college coaching, short- and long-term disability, voluntary AD&D coverage, voluntary accident coverage, voluntary life insurance, voluntary disability insurance, and voluntary long-term care insurance. We don't stop there - eligible employees can also receive mobile service & home internet discounts, pet insurance, and access to commuter and transit programs! To learn about T-Mobile’s amazing benefits, check out www.t-mobilebenefits.com.

Never stop growing!
As part of the T-Mobile team, you know the Un-carrier doesn’t have a corporate ladder–it’s more like a jungle gym of possibilities! We love helping our employees grow in their careers, because it’s that shared drive to aim high that drives our business and our culture forward. By applying for this career opportunity, you’re living our values while investing in your career growth–and we applaud it. You’re unstoppable!

T-Mobile USA, Inc. is an Equal Opportunity Employer. All decisions concerning the employment relationship will be made without regard to age, race, ethnicity, color, religion, creed, sex, sexual orientation, gender identity or expression, national origin, religious affiliation, marital status, citizenship status, veteran status, the presence of any physical or mental disability, or any other status or characteristic protected by federal, state, or local law. Discrimination, retaliation or harassment based upon any of these factors is wholly inconsistent with how we do business and will not be tolerated.

Talent comes in all forms at the Un-carrier. If you are an individual with a disability and need reasonable accommodation at any point in the application or interview process, please let us know by emailing ApplicantAccommodation@t-mobile.com or calling 1-844-873-9500. Please note, this contact channel is not a means to apply for or inquire about a position and we are unable to respond to non-accommodation related requests.