Discover the Weefin team

Grégoire Hug began his professional career in 2011 at BNP Paribas Securities Services as an analyst in the Risk and Performance department before becoming the head of the same department in 2016.

In 2018, he embarked on an entrepreneurial adventure and founded WeeFin, a fintech company with the ambition to make sustainable finance more demanding and ambitious.

Marion Aubert co-founded WeeFin to help financial institutions integrate ESG and sustainable finance through advanced software solutions. Leading the company’s international growth, she focuses on expanding into the UK market.

Alongside her operational role, she sits on the Board and Executive Committee, shaping the company’s strategy and governance.In 2025, she was recognized in Forbes 30 Under 30.

Guillaume Klech is one of the co-founders of Weefin and the company's CTO. An engineer by training, he has nearly 20 years of experience, gained in both large industrial groups and the finance sector.

At WeeFin, he leads a technical team whose challenge is to continuously develop our platform so that it can handle growing volumes of data and offer new features that meet our customers' needs, without compromising on security, reliability and availability.

Laura Aich began her career at Edmond de Rothschild as a Middle Officer, before moving on to roles at Natixis Asset Management, Schelcher Prince Gestion, and Meeschaert Amilton AM, where she specialized in process optimization, operational structuring, and organizational transformation.

In 2022, she joined WeeFin as Chief Operating Officer (COO) and member of the Executive Committee, with responsibility for overseeing all operations, structuring growth, and supporting clients.

Before joining WeeFin in July 2025, Matthias Breier worked as ESG Product Manager at CSSP, an ESG reporting company based in Liechtenstein. He then became Product Director, responsible for regulatory reporting at FE fundinfo, a European financial data provider.

He holds a PhD in Business Model Innovation from the University of Lappeenranta in Finland.

Julie Truong joined Weefin as Head of Human Resources in 2022, after working for WWF as HR Manager. She is the driving force behind a positive internal culture and an ambitious employer brand.

Her expertise helped support the company's exponential growth, which has quadrupled its workforce since her arrival (now more than 100 employees).