Lawyers with extensive professional experience and academic background

Founded in Lisbon in 2008, our team is the outward expression of many years of experience, based on the international practice of our founding partner Helena Lopes Xavier.

Our team is the reflection of the know-how, experience and dedication of the founding partner, Helena Lopes Xavier.


Helena Lopes Xavier

Founding Partner

Dual-Qualified Lawyer in Portugal (OAP nº 3.623-L) and Brazil (OAB/RJ nº 71.048) 
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professional background

A member of the Portuguese Bar Association since 1975 and the Brazilian Bar Association since 1992, Helena Lopes Xavier has founded and been a part of some of the most prominent law firms in both countries, such as XBB and Mundie Advogados, practicing law in a variety of areas such as Administrative and Regulatory, Telecommunications, Energy, Corporate and Tax. 

Helena Lopes Xavier also has a strong academic background, having lectured Administrative Law classes at the University of Lisbon, School of Law, and researched, as invited guest, at Ludwig Maximilien Universität – Institut für Politik und öffentliches Recht in Munich. 

Active lawyer in telecommunications and information technology law, in administrative and regulatory law, economic law, competition law, international contracts, public procurement, tax law; administrative and tax litigation.

> Lawyer in Brazil and Portugal with transactional experience combined with regulatory and tax law expertise.

> Officer of the Brazilian IT and Communications Law Association (ABDTIC, former ABDI).

> Portuguese Association for Communication Development – APDC.

> Honorary member of the Brazilian Institute for Tax Planning – IBPT.

> Member of the Editorial Board of the Communications Law Review, Editora Revista dos Tribunais [a Thomson Reuters legal publication].

academic background

> Graduated from the Faculty of Law of the University of Lisbon (1975).

> Seminar for Doctoral Students in Legal-Political Sciences, Faculty of Law, University of Lisbon (1977-1978 and 1978-1979).

> Admitted to a PhD in Legal-Political Sciences by the Faculty of Law of the University of Lisbon (1984).

> Member of the Portuguese Bar Association since 1975 and the Brazilian Bar Association since 1992.

> Admitted by the Munich Court (1990-1995).

> Academic and professional experience in Portugal, Germany and Brazil. She gives lectures and classes on specialized topics in various countries. In Portugal, she taught Economic Law, Administrative Law and Administrative Procedural Law.

> Currently, visiting professor at Jurisnova (Faculty of Law at Universidade Nova).

> Member of the Governmental Commission for the elaboration of the New Administrative Code of Portugal (1981-1983).

> In Germany, guest researcher at the Institute of Public Law at the Faculty of Law at the University of Munich (1986-1991).

> Over 200 opinions on regulatory issues. Author of the book “The Special Competition Regime in Telecommunications Law” (ed. Forense), Rio de Janeiro 2003, and several articles published in Brazil and abroad, cited by doctrine and jurisprudence.

associations

> Member of the Portuguese Bar Association
1975 – Present

> Member of the Brazilian Bar Association
1992 – Present

> Admitted to Munich Tribunal
1989 – 1995

languages

English, French, German and Portuguese.

professional background

A member of the Portuguese Bar Association since 1975 and the Brazilian Bar Association since 1992, Helena Lopes Xavier has founded and been a part of some of the most prominent law firms in both countries, such as XBB and Mundie Advogados, practicing law in a variety of areas such as Administrative and Regulatory, Telecommunications, Energy, Corporate and Tax. 

Helena Lopes Xavier also has a strong academic background, having lectured Administrative Law classes at the University of Lisbon, School of Law, and researched, as invited guest, at Ludwig Maximilien Universität – Institut für Politik und öffentliches Recht in Munich. 

Active lawyer in telecommunications and information technology law, in administrative and regulatory law, economic law, competition law, international contracts, public procurement, tax law; administrative and tax litigation.

> Lawyer in Brazil and Portugal with transactional experience combined with regulatory and tax law expertise.

> Officer of the Brazilian IT and Communications Law Association (ABDTIC, former ABDI).

> Portuguese Association for Communication Development – APDC.

> Honorary member of the Brazilian Institute for Tax Planning – IBPT.

> Member of the Editorial Board of the Communications Law Review, Editora Revista dos Tribunais [a Thomson Reuters legal publication].

academic background

> Graduated from the Faculty of Law of the University of Lisbon (1975).

> Seminar for Doctoral Students in Legal-Political Sciences, Faculty of Law, University of Lisbon (1977-1978 and 1978-1979).

> Admitted to a PhD in Legal-Political Sciences by the Faculty of Law of the University of Lisbon (1984).

> Member of the Portuguese Bar Association since 1975 and the Brazilian Bar Association since 1992.

> Admitted by the Munich Court (1990-1995).

> Academic and professional experience in Portugal, Germany and Brazil. She gives lectures and classes on specialized topics in various countries. In Portugal, she taught Economic Law, Administrative Law and Administrative Procedural Law.

> Currently, visiting professor at Jurisnova (Faculty of Law at Universidade Nova).

> Member of the Governmental Commission for the elaboration of the New Administrative Code of Portugal (1981-1983).

> In Germany, guest researcher at the Institute of Public Law at the Faculty of Law at the University of Munich (1986-1991).

> Over 200 opinions on regulatory issues. Author of the book “The Special Competition Regime in Telecommunications Law” (ed. Forense), Rio de Janeiro 2003, and several articles published in Brazil and abroad, cited by doctrine and jurisprudence.

associations

> Member of the Portuguese Bar Association
1975 – Present

> Member of the Brazilian Bar Association
1992 – Present

> Admitted to Munich Tribunal
1989 – 1995

languages

English, French, German and Portuguese.


Jônata Guimarães

Partner

Dual-Qualified Lawyer in Portugal (OAP nº 64089-L) and Brazil (OAB/SP nº 433.599)

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academic background

> Master’s in Taxation at Lisbon Accounting and Business School - ISCAL, ongoing, 2022-2024.

> Post-Graduate course in Administrative and Tax Litigation – Theory and Practice promoted by the Institute of Legal and Political Sciences (ICJP) and Institute of Economic, Financial and Tax Law (IDEFF), 2021.

> Post-Graduate course in Tax Law from the Institute of Economic, Financial and Tax Law (IDEFF), ongoing, 2021.

> Undergraduate in Law at Mackenzie Presbyterian University, 2019. 

> Teaching Assistant (TA) of General Law Theory at Mackenzie Presbyterian University, 2018.

other professional background

> 08/2019 – 06/2021: Lawyer at Sacha Calmon - Misabel Derzi Consultores e Advogados;

> 10/2018 – 08/2019: Legal Assistant at Sacha Calmon - Misabel Derzi Consultores e Advogados;

> 04/2018 – 10/2019: Tax Litigation Intern at Sacha Calmon - Misabel Derzi Consultores e Advogados;

> 08/2017 – 09/2017: Tax Litigation Intern at Advocacia Lunardelli; 

> 03/2017 – 08/2017: Tax Advisory Intern at LBMF Advocacia de Negócios;

> 07/2016 – 01/2017: Tax Litigation Intern at Martins, Franco e Texeira Sociedade de Advogados;

> 02/2016 – 03/2016: Tax Litigation Intern at Mussi, Ogawa, Lazzarotti & Sobral.

associations

> Member of the Portuguese Bar Association
2021 – Present

> Member of the Brazilian Bar Association
2019 – Present 

> Member of the Tax Law Commission of the Brazilian Bar Association’s São Paulo Branch 
2022 – Present 

> International Association of Young Portuguese Speaking Lawyers (JALP)
2021 – Present 

> Member of the New Lawyers Commission of the São Paulo Institute of Lawyers (CNA/IASP)
2019 – Present 

> Secretary-General of the Commission of Law Academics from the Brazilian Bar Association’s São Paulo Branch
2020 – 2021 

> Member of the Commission for Young Advocacy of the Brazilian Bar Association’s São Paulo Branch 
2020 – 2021 

> Member of the Special Commission on Sexual and Gender Diversity of the Brazilian Bar Association’s São Paulo Branch
2020 – 2021

languages

English and Portuguese.

academic background

> Master’s in financial and Tax Law at the Faculty of Law of the University of Lisbon, ongoing, 2020-2021.

> Post-Graduate course in Administrative and Tax Litigation – Theory and Practice promoted by the Institute of Legal and Political Sciences (ICJP) and Institute of Economic, Financial and Tax Law (IDEFF), 2021.

> Post-Graduate course in Tax Law from the Institute of Economic, Financial and Tax Law (IDEFF), ongoing, 2021.

> Undergraduate in Law at Mackenzie Presbyterian University, 2019. 

> Teaching Assistant (TA) of General Law Theory at Mackenzie Presbyterian University, 2018.

other professional background

> 08/2019 – 06/2021: Lawyer at Sacha Calmon - Misabel Derzi Consultores e Advogados;

> 10/2018 – 08/2019: Legal Assistant at Sacha Calmon - Misabel Derzi Consultores e Advogados;

> 04/2018 – 10/2019: Tax Litigation Intern at Sacha Calmon - Misabel Derzi Consultores e Advogados;

> 08/2017 – 09/2017: Tax Litigation Intern at Advocacia Lunardelli; 

> 03/2017 – 08/2017: Tax Advisory Intern at LBMF Advocacia de Negócios;

> 07/2016 – 01/2017: Tax Litigation Intern at Martins, Franco e Texeira Sociedade de Advogados;

> 02/2016 – 03/2016: Tax Litigation Intern at Mussi, Ogawa, Lazzarotti & Sobral.

associations

> Member of the Portuguese Bar Association
2021 – Present

> Member of the Brazilian Bar Association
2019 – Present 

> Member of the Tax Law Commission of the Brazilian Bar Association’s São Paulo Branch 
2022 – Present 

> International Association of Young Portuguese Speaking Lawyers (JALP)
2021 – Present 

> Member of the New Lawyers Commission of the São Paulo Institute of Lawyers (CNA/IASP)
2019 – Present 

> Secretary-General of the Commission of Law Academics from the Brazilian Bar Association’s São Paulo Branch
2020 – 2021 

> Member of the Commission for Young Advocacy of the Brazilian Bar Association’s São Paulo Branch 
2020 – 2021 

> Member of the Special Commission on Sexual and Gender Diversity of the Brazilian Bar Association’s São Paulo Branch
2020 – 2021

languages

English and Portuguese.


Gabriela Matera Torres

Sócia
Gestora de Equipa

Advogada em Portugal (OAP 66358-L) e no Brasil (OAB/RJ 237.470)

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experiência profissional e académica

> Advogada Júnior na MLuís Advogados Associados (11/2021 – 02/2022)

> Estagiária de Regulatório e Societário na BR Distribuidora (01/2020 – 05/2021)

> Estagiária de Empresarial na BR Distribuidora (06/2019 – 12/2019)

> Estagiária de Arbitragem na Batista Martins Advogados (12/2017 – 05/2019)

> Estagiária de Contencioso Cível na Chediak Advogados (12/2016 – 04/2017)

> Estagiária no Tribunal de Justiça do Estado do Rio de Janeiro (09/2015 – 11/2016)

> Co-autora do artigo “Obras intelectuais criadas por IAs e por entes não humanos” no livro “Direito e Globalização, Estudos em Homenagem ao Professor Carlos Eduardo Adriano Japiassú” (2019)

habilitações académicas

> Licenciatura pela Faculdade de Direito da Universidade do Estado do Rio de Janeiro (2021)

associações

> Membro da Ordem dos Advogados Portugueses
2022 - Presente

> Membro da Ordem dos Advogados do Brasil
2021 - Presente

> Diretora no Comitê de Jovens Mediadores do Centro Brasileiro de Mediação e Arbitragem (CJM/CBMA)
2018 - 2019

línguas

Inglês, Francês e Português.

experiência profissional e académica

> Advogada Júnior na MLuís Advogados Associados (11/2021 – 02/2022) 

> Estagiária de Regulatório e Societário na BR Distribuidora (01/2020 – 05/2021)

> Estagiária de Empresarial na BR Distribuidora (06/2019 – 12/2019)

> Estagiária de Arbitragem na Batista Martins Advogados (12/2017 – 05/2019)

> Estagiária de Contencioso Cível na Chediak Advogados (12/2016 – 04/2017)

> Estagiária no Tribunal de Justiça do Estado do Rio de Janeiro (09/2015 – 11/2016)

> Co-autora do artigo “Obras intelectuais criadas por IAs e por entes não humanos” no livro “Direito e Globalização, Estudos em Homenagem ao Professor Carlos Eduardo Adriano Japiassú” (2019)

habilitações académicas

> Licenciatura pela Faculdade de Direito da Universidade do Estado do Rio de Janeiro (2021)

associações

> Membro da Ordem dos Advogados Portugueses
2022 - Presente

> Membro da Ordem dos Advogados do Brasil
2021 - Presente

> Membro da Ordem dos Advogados do Brasil
2018 - 2019

línguas

Inglês, Francês e Português.


Betina Treiger Grupenmacher

Brazilian Tax Law Counsel

OAB/PR nº 14.840

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professional background

> Lawyer adjunct professor in the undergraduate and postgraduate courses (master's and doctorate) in Tax Law at the Federal University of Paraná and coordinator of the Specialization Course in Tax Law at the Brazilian Institute of Tax Studies – IBET, in Paraná. 

> Advisor to the Taxpayers Council of the Municipality of Curitiba for approximately 10 years 

> Legal advisor to the Budget Committee of the Legislative Assembly of Paraná. 

> She holds a postgraduate degree from the University of Salamanca in Spain and from the Universidad Austral in Argentina. 

> Lecturer at various events. 

> Author of numerous articles in the field of Tax Law - “Efficacy and Applicability of Constitutional Limitations on the Power to Tax” and “International Treaties on Tax Matters and Internal Order”. Coordinator of the projects “Cooperativas e Tributação” and “Tax Law and the New Civil Code”.

> President of the Paraná Tax Law Institute and of IETRE – Tax Studies and International Economic Relations Institute. 

> Professor of Tax Law at the Federal University of Paraná.

academic background

> Graduated from the Pontifical Catholic University of São Paulo. 

> Masters from the Pontifical Catholic University of São Paulo.

> Doctor from the Federal University of Paraná. 

> Post Doctor from the University of Lisbon.

languages

English and Portuguese.

professional background

> Lawyer adjunct professor in the undergraduate and postgraduate courses (master's and doctorate) in Tax Law at the Federal University of Paraná and coordinator of the Specialization Course in Tax Law at the Brazilian Institute of Tax Studies – IBET, in Paraná. 

> Advisor to the Taxpayers Council of the Municipality of Curitiba for approximately 10 years 

> Legal advisor to the Budget Committee of the Legislative Assembly of Paraná. 

> She holds a postgraduate degree from the University of Salamanca in Spain and from the Universidad Austral in Argentina. 

> Lecturer at various events. 

> Author of numerous articles in the field of Tax Law - “Efficacy and Applicability of Constitutional Limitations on the Power to Tax” and “International Treaties on Tax Matters and Internal Order”. Coordinator of the projects “Cooperativas e Tributação” and “Tax Law and the New Civil Code”.

> President of the Paraná Tax Law Institute and of IETRE – Tax Studies and International Economic Relations Institute. 

> Professor of Tax Law at the Federal University of Paraná.

academic background

> Graduated from the Pontifical Catholic University of São Paulo. 

> Masters from the Pontifical Catholic University of São Paulo.

> Doctor from the Federal University of Paraná. 

> Post Doctor from the University of Lisbon.

languages

English and Portuguese.

Lisbon - Portugal

  • Rua João Penha 10 r/c
    1250-131 Lisboa

  • + 351 213 869 333

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São Paulo - Brazil

  • Av. Pres. Juscelino Kubitschek 1455 - 
    4. andar
    CEP 04543-011

  • +55 11 3280 0044

  • + 55 21 98829 4789

Curitiba - Brazil

  • Rua Carneiro Lobo 729 - Batel
    CEP 80240-240

  • +55 41 3016 9466


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