Finance Transformation Manager - Onestream Consolidation

Location: Katowice – 2 days office/3 days remote

Finance Transformation Manager - OneStream Consolidation

The Opportunity

Join EY GDS Poland’s Finance Consulting Practice, where you will play a pivotal role in building and scaling our OneStream capabilities. As a Senior Manager, you will lead complex OneStream-enabled finance transformation initiatives, with a strong focus on financial consolidation, statutory and management reporting, and the group close. You will develop internal competency, provide solution leadership across the implementation lifecycle, and support go-to-market efforts to position EY as a trusted OneStream transformation partner.

Your Key Responsibilities

• Competency Building: Build and expand the OneStream capability within the team through training, coaching, delivery assets, methodologies, and reusable accelerators.
• Transformation Leadership: Lead end-to-end OneStream transformation programs, from strategy and design through implementation, testing, deployment, and stabilization.
• Consolidation Solution Design: Design and oversee solutions for group consolidation, ownership structures, currency translation, intercompany matching and elimination, journals, allocations, minority interest, and equity accounting.
• Close and Reporting: Improve the financial close and reporting process, including statutory, management, and regulatory reporting requirements.
• OneStream Implementation: Provide functional and solution leadership for OneStream applications, workflows, business rules, data integration, controls, security, dashboards, and reporting.
• Client Advisory: Translate finance requirements into a scalable OneStream architecture and advise clients on process standardization, governance, operating model, and roadmap decisions.
• Go-to-Market Strategy: Shape OneStream offerings, support proposals and RFPs, estimate delivery effort, and present EY’s value proposition to prospective clients.
• Quality and Delivery Governance: Manage scope, risks, dependencies, quality, and senior stakeholder expectations across complex programs.
• Team Leadership: Lead and mentor multidisciplinary teams, strengthening both OneStream platform expertise and consolidation process knowledge.

Skills and Attributes for Success

• OneStream Expertise: Deep functional knowledge of OneStream, including application design, workflows, dimensions, cubes, business rules, data integration, security, reporting, and deployment.
• Financial Consolidation: Strong knowledge of legal and management consolidation, ownership and control, currency translation, intercompany reconciliation and elimination, journals, cash flow, and group reporting.
• Accounting Knowledge: Sound understanding of IFRS and/or local GAAP requirements relevant to consolidation and external reporting.
• Finance Process Design: Ability to redesign close, consolidation, and reporting processes and translate them into effective system requirements and controls.
• Consulting Skills: Strong analytical thinking, structured problem-solving, requirements management, and project delivery capabilities.
• Leadership: Proven ability to lead teams and drive strategic initiatives in complex environments.
• Stakeholder Management: Skilled in engaging CFO, Group Finance, Controlling, Accounting, IT, and other senior stakeholders.
• Communication: Excellent verbal and written communication, workshop facilitation, and executive presentation skills.
• Language Proficiency: Fluent in English; German or French is a plus.

To Qualify for the Role, You Must Have

• Experience: 7+ years in finance transformation, consolidation, group reporting, or EPM consulting.
• OneStream Delivery: Significant hands-on experience delivering OneStream implementations, including at least one end-to-end implementation in a lead functional, solution, or program role.
• Consolidation Experience: Demonstrated experience designing or implementing complex consolidation processes for multinational groups.
• Solution Leadership: Ability to convert business and accounting requirements into a robust OneStream solution design and delivery roadmap.
• Program Leadership: Demonstrated success leading teams, workstreams, and complex client engagements.
• Client Engagement: Strong track record in senior client-facing roles and strategic finance technology advisory.

Good to Have Experience/Exposure

• OneStream Certification: Relevant OneStream certification or formal platform training.
• Extended OneStream Capabilities: Experience with planning, forecasting, account reconciliations, transaction matching, tax provisioning, ESG reporting, or other OneStream solutions.
• Technology Integration: Experience integrating OneStream with SAP S/4HANA, SAP ECC, other ERPs, data warehouses, and master data solutions.
• Accounting Standards: Practical experience with IFRS consolidation and reporting; US GAAP or additional local GAAP knowledge is an advantage.
• Global Experience: Experience managing cross-border projects and working with global finance organizations.
• Language Skills: Proficiency in German or French.

What We Look For

• OneStream Leadership: A leader who can shape and scale OneStream consolidation capabilities within EY and for our clients.
• Innovative Mindset: A proactive approach to simplifying the close, improving controls, and identifying opportunities for automation and innovation.
• Commercial Acumen: Strong business sense and the ability to connect OneStream capabilities with finance strategy and measurable client value.
• Global Collaboration: Willingness to work with EY teams across geographies and industries.

What we offer

EY Global Delivery Services (GDS) is a dynamic and truly global delivery network. We work across nine locations –  Argentina, Hungary, India, the Philippines, Poland, Sri Lanka, Mexico, Spain and the United Kingdom – and with teams from all EY service lines, geographies and sectors, playing a vital role in the delivery of the EY growth strategy. From accountants to coders to advisory consultants, we offer a wide variety of fulfilling career opportunities that span all business disciplines. In GDS, you will collaborate with EY teams on exciting projects and work with well-known brands from across the globe. We’ll introduce you to an ever-expanding ecosystem of people, learning, skills and insights that will stay with you throughout your career.

• Continuous learning: You’ll develop the mindset and skills to navigate whatever comes next.
• Success as defined by you: We’ll provide the tools and flexibility, so you can make a meaningful impact, your way.
• Transformative leadership: We’ll give you the insights, coaching and confidence to be the leader the world needs.
• Diverse and inclusive culture: You’ll be embraced for who you are and empowered to use your voice to help others find theirs.

About EY

EY | Building a better working world

EY exists to build a better working world, helping to create long-term value for clients, people and society and build trust in the capital markets.

Enabled by data and technology, diverse EY teams in over 150 countries provide trust through assurance and help clients grow, transform and operate.

Working across assurance, consulting, law, strategy, tax and transactions, EY teams ask better questions to find new answers for the complex issues facing our world today.

If you can demonstrate that you meet the criteria above, please contact us as soon as possible.

The exceptional EY experience. It’s yours to build.

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