Thiago Luís Sombra > Mattos Filho > Brasilia, Brazil > Lawyer Profile

Mattos Filho
BRASILIA, DF, CEP 70316-109

Work Department





Thiago’s practice focuses on technology, compliance and public law, particularly in regard to anti-corruption investigations conducted by public authorities and regulators, data protection, cybersecurity and digital platforms. He also advises clients on administrative law issues with a focus on infrastructure, assisting with contracting state-owned companies, administrative sanctioning procedures, concessions, public tenders, and administrative contracts in general.



Portuguese, English and Italian.


Thiago is a member of the International Association of Privacy Professionals (IAPP), the Global Digital Economy Committee of the International Chamber of Commerce (ICC), the Technology Committee of the British Chamber of Commerce and the Brazil-Canada Chamber of Commerce. He is also a member of the Federal Senate’s Commission of Jurists for drafting a bill on artificial intelligence and is CIPP/Europe-certified by the International Association of Privacy Professionals.


  • Bachelor of Laws – Centro Universitário de Brasília
  • Master’s in Private Law – Pontifícia Universidade Católica (PUC-SP)
  • Doctorate in Law, Technology and Regulation – Universidade de Brasília (UnB)
  • Post-Doctoral Fellow in Anti-Corruption – Universidade de São Paulo (UsP)
  • Specialization in Cyberlaw, focusing on privacy protection and data protection – London School of Economics
  • Postgraduate Degree in Private Law – Università degli Studi di Camerino, Italy
  • Leadership Executive Program – Singularity University

Lawyer Rankings

Brazil > TMT: Cybersecurity and data privacy

(Next Generation Partners)

Thiago Luís SombraMattos Filho

Mattos Filho has established a strong reputation in data protection and cybersecurity in Brazil, offering clients a ‘holistic view‘, with ‘excellent service and quality’. The team covers the gamut of privacy and security matters across a number of industries, including healthcare, insurance, technology, financial services, retail, education and telecoms. While the Brazilian Data Protection Law (LGPD) is key for a lot of clients, the team also advises on regional compliance strategies, undertakes risk assessments, assesses cloud computing issues, and provides counselling on major data incidents and litigation. Within the team, Fabio Ferreira Kujawski is well known for his expertise in the technology space in Brazil, particularly in his transactional and consulting work. Paulo Brancher is also a technology, telecoms and intellectual property expert. Thiago Luís Sombra is also of note within the team, especially in data privacy and cybersecurity matters from a regulatory, liability and contractual perspective and before the courts. The team also boasts strength at the associate level, with Jaqueline Simas de Oliveira praised by clients for her ‘excellent technical knowledge’. Isabela Fernandes is also noted.

Brazil > TMT: Tech, innovation and digital business

‘Providing clear and concise opinions’, the technology, innovation and digital business team at Mattos Filho leverages its full-service capabilities to provide a comprehensive offering to assist clients in structuring and implementing their digital and technology strategies in Brazil and Latin America. The group has extensive regulatory expertise, providing advice on digital platforms, online marketplaces, cloud computing, artificial intelligence (AI) and Internet of Things (IoT). Coupled with this expertise, the team also provides corporate and tax advice, particularly in technology-related M&A, start-up financing and IT public procurement. Fabio Ferreira Kujawski and Paulo Brancher combine their expertise in civil and consumer law, regularly advising clients and providing strategic counselling for technology companies on their operations and expansion within the relevant Brazilian regulatory frameworks. Thiago Luís Sombra is also of note for his technology litigation experience, representing clients before the regulatory agencies and public authorities. Lisa Worcman is the go-to individual in the team for tax-related tech and digital matters. Luiz Felipe Di Sessa joined the team in March 2022 from Cescon, Barrieu, Flesch & Barreto Advogados, further bolstering the team’s capabilities.

Brazil > City focus - Brasilia > Public law and regulation

The public law and regulation team at Mattos Filho stands out for its expertise in the technology sector, where it attracts a strong following from high-profile companies such as Oracle, Google and Microsoft. Public tenders, public contracts and administrative and judicial disputes are among the department’s areas of expertise. Recently, the group has been particularly busy assisting clients from the banking sector with changes in the constitutional provisions related to the court-ordered debt payments (precatórios) regime. A key contact for matters involving PPPs, concessions, sanction proceedings and litigation at the superior courts is Thiago Luís Sombra, whose expertise spans public law, anti-corruption and technology.

Brazil > Compliance

Household name local and international companies turn to Mattos Filho‘s compliance and corporate ethics department for assistance in settlement negotiations, investigations and crisis management. Recently, the team has been particularly active in private corruption and fraud investigations, as well as internal investigations into workplace issues and harassment, often working alongside colleagues in the labour, white-collar criminal law and antitrust departments. The department also assists in M&A and debt and equity capital market transactions, which the firm is regularly involved in; its advice in this space includes compliance due diligence and risk management. Key practitioners in the team include anti-corruption and corporate integrity expert Renato Tastardi Portella; Thiago Jabor Pinheiro, whose broad practice takes in investigations and enforcement actions in connection with corruption, bid rigging and other forms of corporate misconduct; crisis management specialist Kevin Michael Altit, who draws on over 30 years of experience; and technology, public law and compliance partner Thiago Luís Sombra. Marcel Ribas, dual qualified in both Brazil and New York, was promoted to partner in April 2021; he has experience in cross-border investigations and FCPA enforcement. Luiza Mussoi Cattley, Laura Carneiro de Mello Senra and Romero Cabral da Costa Neto are names to note at the senior associate level.

Brazil > Public law

Renowned law firm’ Mattos Filho fields a public law team ‘of experienced lawyers prepared to promptly meet client demands’. With a multidisciplinary approach, the group is well positioned to act for the largest domestic and foreign clients facing complex challenges in the context of public tenders, concessions of public services, PPPs, regulatory issues and administrative proceedings. Clients operating in a multitude of industries, ranging from airports, railways and toll roads to public sanitation, technology, education, construction, insurance and financial services, instruct the team on a regular basis in the negotiation of administrative contracts, public procurement, administrative sanctioning proceedings, judicial lawsuits and M&A involving companies subject to government regulation. Fully dedicated to public law matters, André Luiz Freire ‘has in-depth technical knowledge’ and is often retained in public concessions, biddings and cases involving audit courts. Based in Brasília, Thiago Luís Sombra devotes his time to anti-corruption, technology and public law issues, and has substantial litigation experience before the superior courts. Henrique Lago Da Silveira, who is a key point of contact for clients from the education sector, leads on mandates involving state-owned companies and administrative proceedings. Raul Dias dos Santos Neto is another noteworthy practitioner focusing on concessions, public bids and state-owned corporation divestments, among other areas.