Sr Engineer, Software - EPM Platform

T-Mobile•Bellevue, WA

15h•Onsite

About The Position

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.

Requirements

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)
Analytical Thinking
Analytics
Collaboration
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

Nice To Haves

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

Responsibilities

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.
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.
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.
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.