The Firm

The expertise of a large firm on a human scale

Sentinel Legal, a specialized law firm based in Geneva, active in Switzerland and internationally

Rigorous, discreet advice, focused on tangible results and workable solutions.

VigilanceMasteryCommitment
Unique Positioning

What sets us
apart

Sentinel Legal does not position itself as a generalist firm. We work exclusively in targeted areas of expertise that we master: criminal law, new technologies, business law and civil litigation, with a deep understanding of the cross-border (CH-EU), operational and economic dimensions of every mandate.

Our size is an advantage: every case is handled by a partner, never entirely delegated. You benefit from a single, experienced point of contact who understands your situation in its entirety and is fully invested in achieving a result.

Matthias Traussnig and Aurélien Rocher combine experience that is directly useful to their clients: private practice, the Public Prosecutor’s Office, the Big Four, university teaching and immersion in technology ecosystems, Legal Tech, AI, Web3. A combination that gives them pragmatism, high standards and a multidisciplinary view of the most complex situations.

Areas of expertise

We only accept mandates that correspond to our expertise. No dispersion, no compromise.

Your interests, protected

Legal. Economic. Strategic. Your interests, in their entirety.

In Concreto Approach

Your reality first. Not a legal text applied to a standardized file.

Network & Experience

A network of partners in Switzerland, Europe, and internationally, and established links with authorities and regulators.

Areas of expertise for our clients

Over 10 years
by your side

Individuals

Criminal defense, white-collar crime, protection of civil rights, negotiation, and representation — before criminal, civil, and administrative authorities.

Innovation Players

Startups, Web3, AI, Legal Tech — fundraising, FINMA compliance, and legal challenges of digital transformation.

Entrepreneurs & Companies

Entity creation, investment structuring, M&A, shareholders' agreements, recurring legal advice, risk management, commercial litigation, and arbitration.

Financial Sector Professionals

Executives, asset managers, compliance officers — personal liability, FINMA proceedings, civil and criminal liability.

France-Switzerland Cross-Border Clientele

Franco-Swiss investors, holders of foreign currency loans (CHF / EUR), wealth structuring, cross-border contracts, and litigation.

Regulated Entities

Licenses, authorizations, legal opinions, compliance, and institutional litigation — an end-to-end regulatory practice.

Mission

Reflection. Defense. Decision.

Supporting our clients in risk management, dispute prevention, and the strategic defense of their interests.

Vision

Vigilance. Anticipation. Response.

Anticipating risks upstream, staying one step ahead, and intervening with precision when the situation demands it.

Entrance of the building on Quai Gustave-Ador
Meeting room overlooking the harbour
The premises

Our offices on the lake

Meetings take place at the firm, in a period building on Quai Gustave-Ador, facing the Jet d’eau.

Matthias Traussnig
Matthias TraussnigAttorney at law, founder
The team

Our vision,
one shared ambition

Full profiles →

Matthias Traussnig

Attorney-at-law — Geneva Bar FR · EN · DE · Criminal · Web3 · Digital Finance

Aurélien Rocher

Attorney-at-law, Prof., Dr. Iur. — Lyon Bar FR · EN · DE · Digital Law · Corporate Law
Collaboration

Working together,
concretely.

022 512 76 00 Geneva · Français, English, Deutsch Schedule a consultation