Recommended expert

Natasha Sirén

Senior Manager – Financial Reporting and Finance Transformation

Natasha Sirén
United Kingdom

Experience

Jul 2018 - Present
7 years 8 months

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.
Jan 2014 - Jun 2018
4 years 6 months

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.
Feb 2010 - Nov 2013
3 years 10 months

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.
Sep 2009 - Feb 2010
6 months

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.
Sep 2007 - May 2009
1 year 9 months

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.
Mar 2007 - Oct 2007
8 months

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.
Feb 2006 - Mar 2007
1 year 2 months

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.

Industries Experience

See where this freelancer has spent most of their professional time. Longer bars indicate deeper hands-on experience, while shorter ones reflect targeted or project-based work.

Experienced in Professional Services (16.5 years), Energy (1.5 years), Utilities (1.5 years), Retail (1 year), and Media and Entertainment (0.5 years).

Professional Services
Energy
Utilities
Retail
Media and Entertainment

Business Areas Experience

The graph below provides a cumulative view of the freelancer's experience across multiple business areas, calculated from completed and active engagements. It highlights the areas where the freelancer has most frequently contributed to planning, execution, and delivery of business outcomes.

Experienced in Project Management (19 years), Finance (14.5 years), Accounting (8.5 years), Strategy (5 years), Sales (4.5 years), and Business Intelligence (4 years).

Project Management
Finance
Accounting
Strategy
Sales
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

Finnish
Native
German
Advanced
English
Advanced
Spanish
Elementary

Education

Oct 2002 - Jun 2003

Buckinghamshire Chilterns University College

MBA · High Wycombe, United Kingdom · Distinction

Oct 1998 - Jun 2001

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

Profile

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Frequently asked questions

Do you have questions? Here you can find further information.

What languages does Natasha speak?

Natasha speaks the following languages: Finnish (Native), German (Advanced), English (Advanced), Spanish (Elementary).

How many years of experience does Natasha have?

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 9 months. Note that Natasha may not have shared all experience and actually has more experience.

What roles would Natasha be best suited for?

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.

What is Natasha's latest experience?

Natasha's most recent position is Senior Manager – Financial Reporting and Finance Transformation at Theta Global Advisors LLP.

What companies has Natasha worked for in recent years?

In recent years, Natasha has worked for Theta Global Advisors LLP.

Which industries is Natasha most experienced in?

Natasha is most experienced in industries like Professional Services, Energy, and Utility Services. Natasha also has some experience in Retail, Media and Entertainment and Publishing.

Which business areas is Natasha most experienced in?

Natasha is most experienced in business areas like Project Management, Finance, and Accounting. Natasha also has some experience in Strategy and Planning, Sales, and Business Intelligence.

Which industries has Natasha worked in recently?

Natasha has recently worked in industries like Professional Services.

Which business areas has Natasha worked in recently?

Natasha has recently worked in business areas like Accounting, Finance, and Project Management.

What is Natasha's education?

Natasha holds a Master from Buckinghamshire Chilterns University College and a Bachelor in Business Studies from Buckinghamshire Chilterns University College.

Does Natasha have any certificates?

Natasha has 2 certificates. These include: ACMA and CGMA.

What is the availability of Natasha?

Natasha is immediately available part-time for suitable projects.

What is the rate of Natasha?

Natasha's rate depends on the specific project requirements. Please use the Meet button on the profile to schedule a meeting and discuss the details.

How to hire Natasha?

To hire Natasha, click the Meet button on the profile to request a meeting and discuss your project needs.