Juan Ferreira
Fintech, venture finance and cross-border corporate law
- Jurisdictions
- Argentina · New York
- Languages
- Spanish · English
Jarsun, Ferreira & Calvo
The Firm
Deals built to stay out of disputes
A boutique international law firm based in Buenos Aires, for companies, founders, funds and investors operating across Argentina, the United States and Latin America. The team brings together attorneys admitted in Argentina and New York, with experience before ICSID and other international forums.
The people behind the work
Meet the partners
Lara Jarsun
International arbitration and cross-border litigation
- Jurisdictions
- Argentina
- Languages
- Spanish · English · French · Italian
Francisco Calvo
Investment arbitration, international disputes and public law
- Jurisdictions
- Argentina · New York
- Languages
- Spanish · English
Our approach
How we work
Look across jurisdictions
Argentine law, U.S. law and the relevant international frameworks enter the analysis together. In a cross-border matter, looking at a single jurisdiction means seeing half the problem.
Connect law with execution
We advise fintechs, startups, funds and companies where regulation, contracts and commercial execution have to advance as one.
Work directly with a partner
There are no layers between the client and the judgment. The person who knows the file, the strategy and the commercial context is the same partner who picks up the phone.
Bring deals and disputes together
We structure contracts knowing how they get litigated, and we litigate knowing how deals are put together. That back and forth flags risk before it turns into conflict.
Our story
Two practices, one firm
In 2025 we brought the two practices together in a single firm. The reason is easy to state and hard to find in the market: cross-border business, arbitration and complex litigation are connected. A poorly structured deal ends in a dispute, and a dispute is won or lost on how the deal was structured. At large firms that connection sits scattered across departments. We built a boutique around it.
Jarsun, Ferreira & Calvo began with two paths that crossed far from Buenos Aires. Juan Ferreira and Francisco Calvo met in the United States as Fulbright scholars, during their LL.M. studies at Fordham and Columbia. Lara Jarsun and Francisco spent years working together in international arbitration, on investment cases before ICSID and commercial arbitrations under ICC and UNCITRAL rules.
The team's training backs that bet. Lara read international relations and political science at the London School of Economics, where she is now an Assistant Professor. And the investment arbitration practice is completed by Osvaldo Guglielmino as of counsel: former Attorney General of the Argentine Treasury, the office that directs Argentina's defense before ICSID.
Tell us about your matter
Share the context and where the matter stands. A partner reads every inquiry and will tell you plainly whether we are the right firm for it.