Natasha Sirén-Senior Manager – Financial Reporting and Finance Transformation
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Experience
Senior Manager – Financial Reporting and Finance Transformation
Theta Global Advisors LLP
- Lead cross-sector financial transformation programs for FTSE 100 and public sector clients, specialising in IFRS 16 implementations, financial reporting optimisation, and GAAP conversions.
- Built and currently lead the firm's Leasing Practice, advising on complex lease accounting and data challenges, and implementing software solutions for both IFRS 16 and ASC 842.
- Serve as engagement lead, managing delivery teams, vendor relations, and senior stakeholder alignment.
- Drive commercial growth by developing new service offerings in accounting advisory and deal-related engagements.
- Deliver measurable outcomes including cost savings, improved audit readiness, and sustainable process improvements.
Independent GBS Advisor
Independent GBS Advisor
- Successfully framed and led business development opportunities for multinational clients through an independent practice.
- Led feasibility studies, benchmarking, and GBS/SSC implementations while partnering with a network of associates.
- Balanced advisory work with a career break to support family needs and personal development.
Senior Consultant / Project Manager
The Hackett Group
- Led global finance transformation projects, generating up to £50m in cost savings and significant process efficiencies.
- Directed projects from feasibility to implementation with a focus on performance optimisation and best practice adoption.
- Contributed to the development of GBS and SSC intellectual capital, including thought leadership and benchmarking tools.
Project Manager (Contract)
Technicolor
- Delivered business analysis and reporting enhancements to optimise operational workflows, data reliability, and production throughput leading the inflow of new work into production facilities.
- Standardised operating procedures and led cross-functional process improvement initiatives.
Programme & Financial Management Consultant (Contract)
EDF Energy (UK)
- Managed programme governance, reporting, and financial planning for £1.2m data centre consolidation initiative.
- Led business case modelling and stakeholder engagement for major sustainability-driven ITDR investment.
Senior Consultant, Finance Transformation
Deloitte MCS Ltd (UK)
- Delivered finance operating model and shared services design projects as part of Deloitte's consulting practice.
- Gained exposure to high-profile client engagements and developed foundational consulting skills.
Senior Manager Shared Services – Europe
Carphone Warehouse Group
- Directed SSC operations for European subsidiaries, overseeing financial controls, reporting, and regional finance teams.
- Led shared services design and optimisation projects contributing to 30% cost reductions.
- Oversaw GAAP reporting and consolidation, enhancing process reliability and local stakeholder integration.
Industry experience
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Experienced in Professional Services, Energy, Utilities, Retail, and Media and Entertainment.
Business area experience
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Experienced in Project Management, Finance, Accounting, Strategy, Sales, and Business Intelligence.
Summary
Multilingual Chartered Management Accountant (ACMA, CGMA) and MBA-qualified executive with over 20 years’ international experience delivering complex finance transformation and financial reporting projects across a wide range of industries. Proven leadership in managing multi-million-pound change initiatives across private and public sectors, with a focus on driving operational excellence, digital innovation, and sustainable business impact. Expert in stakeholder engagement, cross-functional leadership, and delivering pragmatic solutions that align financial strategy with business goals.
Languages
Education
Buckinghamshire Chilterns University College
MBA · High Wycombe, United Kingdom · Distinction
Buckinghamshire Chilterns University College
BA in Business Studies · Business Studies · High Wycombe, United Kingdom · 2:1
Certifications & licenses
ACMA
Chartered Institute of Management Accountants
CGMA
Chartered Institute of Management Accountants
Statistics
Experience
Expertise
Qualifications
Profile
Frequently asked questions
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Natasha speaks the following languages: Finnish (Native), German (Advanced), English (Advanced), Spanish (Elementary).
Natasha has at least 20 years of experience. During this time, Natasha has worked in at least 7 different roles and for 7 different companies. The average length of individual experience is 3 years and 10 months. Note that Natasha may not have shared all experience and actually has more experience.
Based on recent experience, Natasha would be well-suited for roles such as: Senior Manager – Financial Reporting and Finance Transformation, Independent GBS Advisor, Senior Consultant / Project Manager.
Natasha's most recent position is Senior Manager – Financial Reporting and Finance Transformation at Theta Global Advisors LLP.
In recent years, Natasha has worked for Theta Global Advisors LLP.
Natasha is most experienced in industries like Professional Services, Energy, and Utilities. Natasha also has some experience in Retail and Media and Entertainment.
Natasha is most experienced in business areas like Project Management, Finance, and Accounting. Natasha also has some experience in Strategy, Sales, and Business Intelligence.
Natasha has recently worked in industries like Professional Services.
Natasha has recently worked in business areas like Accounting, Finance, and Project Management.
Natasha holds a Master from Buckinghamshire Chilterns University College and a Bachelor in Business Studies from Buckinghamshire Chilterns University College.
Natasha has 2 certificates. These include: ACMA and CGMA.
The availability of Natasha needs to be confirmed.
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