Sr Engineer, Software - EPM Platform

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!

Job Overview
This role is responsible for designing, building, and supporting scalable OneStream planning solutions that enable enterprise financial planning and forecasting capabilities for our FP&A Business Partners. The Senior Engineer will work closely with FP&A, Data, and our EPM Platform Engineering teams to build and expand connected planning solutions using OneStream and related technologies.
This is a hands-on engineering role focused on solution development, planning platform expansion, and modernization initiatives. The ideal candidate brings strong EPM Platform implementation experience, FP&A domain knowledge, and the ability to translate business requirements into scalable technical solutions. You'll be expected to drive design decisions, not just implement them.

Job Responsibilities:

Planning Solution Engineering

• Design, develop, and enhance OneStream Planning solutions supporting enterprise planning models across revenue, customers, capex, workforce, and other planning domains.
• Lead end-to-end solution design from requirements through deployment, including technical documentation and peer review.
• Build scalable planning applications supporting forecasting, workforce planning, and connected planning capabilities.
• Develop driver-based planning models, scenario analysis, and rolling forecast capabilities.
• Translate FP&A business requirements into scalable, enterprise-grade OneStream planning solutions.

Development & Platform Engineering

• Develop and maintain Business Rules and calculations using VB.NET/C# scripting and native OneStream capabilities.
• Build and maintain Cube Views, Dashboards, and Data Entry Forms, Extensible Dimensionality(XD), routines to support planning workflows.
• Build and maintain Workflow profiles, Task Groups, and Workflow Steps to orchestrate the end-to-end planning process including input, review, and approval cycles.
• Implement error handling, logging, and diagnostic routines within Business Rules using OneStream's Logging API and BRUtils methods.
• Support application performance optimization, cube tuning, metadata management, security and usability improvements.
• Contribute to scalable application design, reusable components, and engineering best practices.
• Participate in new capability development and platform expansion initiatives.

Integrations & Data Management

• Design and support integrations using OneStream Data Management Rules, Data Integration connectors, and related integration frameworks.
• Configure Data Integration connectors (File-based, JDBC, REST API, Boomi) to load Actuals, master data, and reference data from various ERP and HR systems such as SAP, Oracle, Workday, and Salesforce.
• Support master data synchronization workflows including automated dimension member updates, hierarchy refreshes, and member attribute maintenance.
• Partner with Data and FP&A teams to improve data quality, reconciliation, and planning workflows.

Collaboration & Delivery

• Collaborate with global engineering teams, FP&A stakeholders, and cross-functional partners to deliver high-quality planning solutions.
• Support Agile delivery practices and continuous improvement initiatives.
• Comfortable presenting trade-off analyses to non-technical finance leaders.
• Mentor team members through technical guidance and knowledge sharing.
• Create and maintain technical documentation, system designs, and operational procedures.
• Opportunity to contribute to broader platform strategy as the team scales.

Education and Work Experience:

• Bachelor's Degree plus 5 years of related work experience OR Advanced degree with 3 years of related experience (Required)
• Acceptable areas of study include Computer Science, Software Engineering, Information Management or equivalent experience in field (Required)
• 4-7 years Technical engineering experience. (Required)

Preferred:

• Software engineering or EPM Platform experience (OneStream) Planning experience, including Business Rules development, Cube Views, Dashboards, and Data Management.
• Proven experience owning end-to-end solution design for enterprise EPM implementations.
• Strong analytical, problem-solving, and communication skills.
• Ability to facilitate requirements workshops with FP&A stakeholders and translate outputs into technical design documents.
• Experience with OneStream MarketPlace solutions (e.g., Specialty Planning, Reporting Packages, Workforce Planning).
• Experience with workforce planning, long-range planning, or connected planning initiatives.
• Familiarity with OneStream AI/ML capabilities or exposure to AI-assisted planning workflows and GenAI tools supporting productivity.
• OneStream certification or formal OneStream training.
• Familiarity with Agile/DevOps and CI/CD practices applied to EPM platform development.
• Prior experience with Oracle EPBCS, SAP BPC, or Anaplan as a point of comparison/migration context.
• Exposure to financial consolidation workflows including intercompany eliminations, currency translation, and minority interest.
• 1+ year experience with Oracle EPBCS suite of products

Knowledge, Skills and Abilities:

• Analytical Thinking
• Analytics
• Collaboratio
• Communication
• Customer Service
• Mentorship
• Programming Languages
• Software Design
• Software Development
• System Integration
• Technical Writing

• 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: $113,600 - $205,000

Corporate Bonus Target: 15%

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, https://paylookup.t-mobile.com/paylookup?reqID=REQ352995¶dox=1

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 [email protected] 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.