Leadership team

Our passionate and dedicated leadership team is committed to fostering the growth of our organization with the aim of better serving an expanding community of skilled immigrants and refugees. Their vision serves as a guide for Windmill employees, and collectively, we contribute to building a more inclusive and prosperous Canada.

Shamira Madhany

Secretary, Chair, Loan Committee

Managing Director and Deputy Executive Director, World Education Services

Sharon Castelino

Chief Executive Officer

Sharon brings more than 25 years of executive leadership experience across financial services, lending, credit and risk management and inclusive-finance innovation. She is dedicated to helping skilled immigrants and refugees rebuild their careers and achieve economic security.

Sharon brings more than 25 years of executive leadership experience across financial services, lending, credit and risk management and inclusive-finance innovation. She is dedicated to helping skilled immigrants and refugees rebuild their careers and achieve economic security.

Alex Almanza

National Director and Chief Information Officer

As a seasoned tech industry leader, Alex has a proven track record of building and leading successful teams from the ground up. With nearly a decade of startup experience, he understands the unique challenges and opportunities of growth. He contributed significantly to the success of SkipTheDishes and Neo Financial, two of Canada’s most successful startups, by introducing processes, implementing new technologies, integrating platforms, and supporting other business units to prepare for rapid growth. Born in Uruguay and having lived in the U.S. and Brazil before moving to Canada in 2016, Alex is deeply connected to the immigrant experience, motivating his transition to the nonprofit sector to serve fellow immigrants.

As a seasoned tech industry leader, Alex has a proven track record of building and leading successful teams from the ground up. With nearly a decade of startup experience, he understands the unique challenges and opportunities of growth.

Carrie Church

National Director, Operations

Carrie joined Windmill in March 2014, and was appointed as the National Director, Operations in April 2015. Carrie’s passion and experience for ensuring that the right people are in the right position, and have access to the appropriate tools to meet the needs of our clients, are the driving force behind her work at Windmill.

Prior to her work with Windmill, Carrie spent more than 20 years in the charitable sector in Saskatchewan; leading team development projects; supporting CEOs and Board members; facilitating technology directives; and aligning operational and human resource strategies.

Carrie joined Windmill in March 2014, and was appointed as the National Director, Operations in April 2015. Carrie’s passion and experience for ensuring that the right people are in the right position, and have access to the appropriate tools to meet the needs of our clients, are the driving force behind her work at Windmill.

Sarah Legault

National Director, Philanthropy and Campaigns

Sarah is a seasoned fundraising executive with over 20 years of experience leading strategic philanthropy across some of Canada’s most respected organizations. Most recently, she served as Vice President of Philanthropy at The Royal Canadian Geographical Society, where she helped triple annual giving and guided the development of a new five-year strategic plan. Throughout her career—including senior roles at NEXT Canada, the Rotman School of Management, SickKids Foundation and the Canadian Red Cross—Sarah has built and led high-performing teams, secured major gifts and developed meaningful partnerships with donors, corporate leaders and government stakeholders. Deeply committed to the philanthropic sector, she is passionate about advancing mission-driven work through collaboration, innovation and strategic growth.

Sarah is a seasoned fundraising executive with over 20 years of experience leading strategic philanthropy across some of Canada’s most respected organizations. Most recently, she served as Vice President of Philanthropy at The Royal Canadian Geographical Society, where she helped triple annual giving and guided the development of a new five-year strategic plan.

Linda Luu

National Director, Marketing and Communications

Linda is a marketing leader with years of experience in brand building, advertising, and marketing strategy. Over the years, Linda has worked in different cities and countries, including Singapore, Malaysia, and Canada, with top-tier brands such as McDonald’s, Dyson, and Heinz. Most recently, she worked at the Haskayne School of Business, University of Calgary. The daughter of Vietnamese refugees, Linda is passionate about empowering newcomers to help them build the Canadian dream.


Linda is a marketing leader with years of experience in brand building, advertising, and marketing strategy. Over the years, Linda has worked in different cities and countries, including Singapore, Malaysia, and Canada, with top-tier brands such as McDonald’s, Dyson, and Heinz.

Nami Maraj CPA, CA

National Director and Chief Financial Officer

Nami joined Windmill Microlending as National Director and Chief Financial Officer in spring 2024. She brings over 15 years of experience in finance and accounting to our team, and a comprehensive understanding of risk and control management, financial planning and analysis, and financial reporting thanks to former roles at PricewaterhouseCoopers, OMERS and CanCap Group. At CanCap, she played a pivotal role in managing auto and consumer loan securitization programs alongside managing treasury functions across multiple entities as the Director of Finance.

Originally from Trinidad and Tobago, Nami is thrilled to be able to leverage her accounting experience to enable newcomers to build brighter futures for themselves and their families at Windmill.

Nami joined Windmill Microlending as National Director and Chief Financial Officer in spring 2024. She brings over 15 years of experience in finance and accounting to our team, and a comprehensive understanding of risk and control management, financial planning and analysis, and financial reporting thanks to former roles at PricewaterhouseCoopers, OMERS and CanCap Group.

Samuel Ndayishimye

National Director, Stakeholder Relations & Quebec

Samuel brings over 20 years of experience in public policy, public affairs, leadership development, and organizational management. A graduate of HEC Montréal and former Chief of Staff to a Deputy Minister, he has a proven track record of building trusted relationships across sectors. His journey — from his Rwandan origins, arriving in Canada as a refugee from South Africa, to becoming a senior public servant — reflects a lifelong commitment to helping others reach their full potential.

Samuel brings over 20 years of experience in public policy, public affairs, leadership development, and organizational management. A graduate of HEC Montréal and former Chief of Staff to a Deputy Minister, he has a proven track record of building trusted relationships across sectors.

Join our team

Interested in a career with Windmill?