Sofia de Sampaio Jalles es socia en Armesto & Asociados, un despacho de árbitros fundado por Juan Fernández-Armesto. Tiene nacionalidad portuguesa y es abogada colegiada en Francia.
Sofia actúa como árbitra y secretaria de tribunales arbitrales en procedimientos arbitrales nacionales e internacionales, ad hoc e institucionales, comerciales y de inversión. Los procedimientos en los que participa suelen estar administrados por la CCI, el CIADI, la CPA, y instituciones arbitrales locales. El listado de arbitrajes en los que actuó se encuentra en anexo.
Entre 2021 y 2025, Sofia fue anualmente reconocida como “Future Leader” en arbitraje internacional por el Lexology Index (antes Who’s Who Legal). Sofia es una de las representantes del ICC YAAF (ICC Young Arbitration and ADR Forum) para Europa y Asia Central entre 2024 y 2026.
Experiencia Profesional
Antes de incorporarse a Armesto & Asociados, Sofia de Sampaio Jalles perteneció al equipo de arbitraje internacional del despacho Dechert (Paris) LLP. Previamente estuvo vinculada al departamento de Fusiones y Adquisiciones del despacho PDGD Avocats en Paris y al despacho portugués Vieira de Almeida & Associados en Lisboa.
Formación
Sofia de Sampaio Jalles realizó sus estudios universitarios en Sciences Po Paris, en Francia, licenciándose en Ciencias Políticas en 2011. Durante su licencia, Sofia de Sampaio Jalles hizo una estancia de un año en King’s College London, en Reino Unido. En 2014 Sofia de Sampaio Jalles obtuvo su Maestría en Derecho Mercantil, con una especialización en resolución de disputas, en Sciences Po Paris.
De 2014 a 2016 Sofia de Sampaio Jalles se incorporó a la Ecole de Formation des Barreaux de la Cour d’appel de Paris, completando su formación como abogado y obteniendo el Certificat d’Aptitude à la Profession d’Avocat (2016).
Languages
• Portugués (lengua materna)
• Español (bilingüe)
• Inglés (bilingüe)
• Francés (bilingüe)
Asociaciones Profesionales
Colegiada en el Barreau de Paris
Representante de ICC YAAF (ICC Young Arbitration and ADR Forum) para Europa y Asia Central (2024-2026)
Miembro del Grupo de Trabajo de Arbitraje con Estados del Centro Internacional de Arbitraje de Madrid – Centro Iberoamericano de Arbitraje (2024-)
Miembro de la Comisión de Examen previo de Laudos del Centro Internacional de Arbitraje de Madrid – Centro Iberoamericano de Arbitraje (2024-)
Miembro de la Comisión de Recusaciones y Autorización de Intervención de Terceros de la Corte de Arbitraje de Madrid (2024-)
Miembro del Host Committee del Congreso ICCA 2026 Madrid (2023-)
Co-Directora de la Tribunal Secretary Network (2023-)
Co-Directora del Programa de Mentoring del Club Español e Iberoamericano de Arbitraje (2022-)
Miembro de la Comisión de Internacionalización del Centro de Arbitraje de la Cámara Portuguesa de Comercio e Industria (2022-)
Miembro del Consejo de Arbitraje de Inversión de la Asociación Portuguesa de Arbitraje (2022-)
Co-Fundadora del Sports Arbitration Moot (2021-)
Miembro del SVAMC AI Task Force’s AI Guidelines Review Committee (2024)
Miembro del Comité Redactor del Glosario Arbitral ALARB (2023-2024)
Miembro de la Task Force for the revision of the IBA Guidelines on Conflicts of Interest in International Arbitration (2023)
Group Advisor del Young ICCA Mentoring Programme (2022-2023)
Co-Directora del IASC (International Arbitration Seminars & Courses) (2022-2024)
Secretaria de la Comisión para la definición del Arbitraje Internacional del Centro Internacional de Arbitraje de Madrid (2020-2021)
Miembro del Comité de Coordinación para la redacción del Código de Buenas Prácticas en Arbitraje Deportivo del Club Español del Arbitraje (2020-2023)
Co-Fundadora de MAD VYAP (Madrid Very Young Arbitration Practitioners) (2019-2021)
Miembro de ICC YAAF
Miembro de Young ICSID
Miembro del CEIA (Club Español e Iberoamericano del Arbitraje)
Miembro de la APA (Asociación Portuguesa de Arbitraje)
Miembro del Young ICCA
As Arbitrator
Mexican Company vs. Mexican and Spanish Companies, Co-Arbitrator, ICC, Mexican Law, Spanish language (2025).
Uruguayan Company vs. Irish Company, President of the Tribunal, ad hoc, Uruguayan Law, Spanish language (2024).
Brazilian Company vs. Brazilian Companies and individuals vs. Portuguese individuals, Co-Arbitrator, ICC, Brazilian Law, Portuguese language (2024).
Spanish Company vs. Portuguese Companies, President of the Tribunal, CCILE, Portuguese Law, Portuguese language (2023).
Swiss Company vs. Panamanian Company, Co-Arbitrator, CIAM, Colombian Law, Spanish language (2022).
Portuguese Company vs. Spanish Company, President of the Tribunal, ad hoc, aircraft management agreement, Portuguese law, English language (2021).
Honduran Company vs. Spanish construction Company, Sole Arbitrator, Corte de Arbitraje de Madrid, construction agreement, Spanish law, Spanish language (2020).
AS SECRETARY OR ASSISTANT TO THE ARBITRAL TRIBUNAL / SOLE ARBITRATOR
Indo Gold PTY Limited (Australia) vs. Republic of India, Administrative Secretary (chairman: J. Fernández-Armesto; co-arbitrators: S. Alexandrov and L. Nageswara Rao), UNCITRAL Rules, administered by the PCA, English language. Counsel to Claimant: Essex Court Chambers, Twenty Essex Chambers, 7 Wentworth Selborne, 3 Verulam Buildings and King & Spalding LLP. Counsel to Respondent: P&A Law Offices and Hogan Lovells International LLP (2024)
Asian Investor vs. European State, Administrative Secretary (chairman: J. Fernández-Armesto; co-arbitrators: S. Jagusch KC and C. von Wobeser), ICC, investment arbitration, English language. Counsel to Claimant: Boies Schiller Flexner. Counsel to Respondent: State’s legal department (2024).
Eastern European public company vs. Eastern European public company, Administrative Secretary (chairman: J. Fernández-Armesto; co-arbitrators: Y. Derains and K. P. Berger), ad hoc, gas supply agreement, Swedish law, English language. Counsel to Claimant: Castrén & Snellman Attorneys and Mannheimer Swartling Advokatbyrå. Counsel to Respondent: Mansors (2022).
Encavis and others vs. Italian Republic, Assistant to the Tribunal (chairman: J. Fernández-Armesto; co-arbitrators: W. Miles QC and A. Mourre), ICSID Case No. ARB/20/39, investment arbitration, English language. Counsel to Claimants: King & Spalding. Counsel to Respondent: Avvocatura dello Stato and Ministero degli Affari Esteri e della Cooperazione Internazionale (2021).
Arab Company and National vs. Arab State, Administrative Secretary to the Arbitral Tribunal (chairman: J. Fernández-Armesto; co-arbitrators: C. Poncet and N. G. Ziadé), OIC Investment Agreement (ICC), English language. Counsel to Claimants: DLA Piper and Dr. Ioannis Konstantinidis. Counsel to Respondent: Mr. Christopher Harris QC and Squire Patton Boggs (2020).
Indian Company v. African State, Administrative Secretary to the Tribunal (chairman: J. Fernández-Armesto; co-arbitrators: G. Santiago Tawil and H. Perezcano Díaz), UNCITRAL, English language. Counsel to Claimant: Addleshaw Goddard LLP, Miranda & Associados and Pimenta & Associados; Counsel to Respondent: Dorsey & Whitney LLP (2020).
Mauritian Company vs. BVI and Mauritian Companies, Administrative Secretary (chairman: J. Fernández-Armesto; co-arbitrators: P. Friedland and A. Soveral Martins), ICC, shareholders’ agreement, law of African Republic, English language. Counsel to Claimant: Sullivan & Cromwell; Counsel to Respondent: Mayer Brown (2019).
LSG Building Solutions GmbH and others vs. Romania, Assistant to the Arbitral Tribunal, (chairman: J. Fernández-Armesto; co-arbitrators: P.M. Dupuy and O. T. Johnson Jr.), ICSID Case No. ARB/18/19, investment arbitration under the Energy Charter Treaty, English language. Counsel to Claimants: King & Spalding; Counsel to Respondent: Curtis, Mallet-Prevost, Colt & Mosle (2019).
Brazilian Company vs. Brazilian Companies, Administrative Secretary to the Arbitral Tribunal (chairman: J. Fernández-Armesto; co-arbitrators: P. Mota Pinto), ICC, share purchase agreement, Brazilian law, Portuguese language. Counsel to Claimant: Mattos Filho, Veiga Filho, Marrey Jr. e Quiroga Advogados; Ferro, Castro Neves, Daltro & Gomide Advogados; Wilmer Cutler Pickering Hale and Dorr; King & Spalding. Counsel to Respondent 1: E. Munhoz Advogados; Lefosse Advogados; Freshfields Bruckhaus Deringer. Counsel to Respondent 2: Bichara Advogados, White & Case (2019).
Gramercy Funds Management LLC and Gramercy Peru Holdings LLC vs. Republic of Peru, Assistant to the Arbitral Tribunal (chairman: J.Fernández-Armesto; co-arbitrators: S. Drymer and B. Stern), UNCITRAL administered by ICSID, investment arbitration under TPA USA-Peru; English and Spanish languages. Counsel to Claimant: Debevoise & Plimpton; Rodrigo, Elias & Medrano. Counsel to Respondent: Arnold & Porter Kaye Schole (2018).
Private Companies and Individuals vs. Brazilian Entity, Administrative Secretary to the Arbitral Tribunal (chairman: J. Fernández-Armesto; co-arbitrators: S. K. Chermont de Britto and N. C. da Silva Flores), ICC, settlement agreement, Brazilian law, Portuguese language. Counsel to Claimant: Didier, Sodré & Rosa; Shearman & Sterling LLP; Herbert Smith Freehills LLP; In-house. Counsel to Respondent: Tozzini Freire Advogados; Siqueira, Bottrel, Almeida e Silva Advogados; Cleary Gottlieb Steen & Hamilton (2018).
Luxembourg Holding Company vs. Luxembourg Holding Company, Administrative Secretary to the Arbitral Tribunal (chairman: J. Fernández-Armesto; co-arbitrators: A. Hierro and D. Arias), ICC, share purchase agreement, Portuguese law, English language. Counsel to Claimant: PLMJ Advogados; Counsel to Respondent: Morais Leitão, Galvão Teles, Soares da Silva & Associados (2018).
DP World Limited vs. Kingdom of Belgium, Assistant to the Chairman (chairman: J. Fernández-Armesto; co-arbitrators: B. Stern and S. Alexandrov), ICSID Case No. ARB/17/21, investment arbitration under BIT, English language (2017).
Oil and Gas Company vs. African State-Owned Entity, Administrative Secretary to the Arbitral Tribunal (chairman: J. Fernández-Armesto; co-arbitrators: E. Damião Gonçalves and J. E. Nunes Pinto), UNCITRAL (ICC), production sharing contract, Portuguese language (2017).
French distillery vs. Spanish distillery, Administrative Secretary to the Sole Arbitrator, Corte de Arbitraje de Madrid, ex aequo et bono, Spanish language (2016).
Spanish Fund manager vs. Spanish Venture Capital Fund, Administrative Secretary to the Arbitral Tribunal, Corte de Arbitraje de Madrid, Spanish law and language (2016).
Spanish beverage producer vs. Distributor of beverage, Administrative Secretary to the Arbitral Tribunal, Corte Española de Arbitraje, distribution agreement, Spanish law and language (2016).
Spanish construction company vs. Spanish construction company, Secretary to the Emergency Arbitrator, Corte Española de Arbitraje, consortium agreement, Spanish law and language (2016).
Spanish and Chilean train construction companies vs. Canadian and Chilean train construction companies, Administrative Secretary to the Sole Arbitrator, ICC, consortium agreement, Spanish law, English language (2016).
UAE Investor vs. Brazilian Investors, Administrative Secretary to the Arbitral Tribunal (chairman: J. Fernández-Armesto; co-arbitrators: P. Batista Martins and V. Galíndez), ICC, shareholders agreement relating to a major construction project, Brazilian law, English language (2016).
PT Ventures, SGPS, S.A. vs. The Republic of Cabo Verde, Assistant to the Arbitral Tribunal, ICSID Case No. ARB/15/12, investment arbitration under BIT, Portuguese language (2015).
Telecom Company vs. African State, Administrative Secretary to the Arbitral Tribunal, ICC, shareholders’ agreement, Portuguese language (2015).
State-Owned Oil and Gas Company vs. Agency of a State, Administrative Secretary to the Arbitral Tribunal, ICC, concession agreement, Portuguese language (2014).
European Republic vs. Private Companies, Administrative Secretary to the Arbitral Tribunal, ICC, privatization in the shipbuilding sector, English language (2014).
February 2025
“Corruption in International Arbitration” – Moderator of the panel at the VIII Oxford Arbitration Day (Oxford, United Kingdom) (2024).
“The protection of foreign investment in Angola: Is international arbitration possible?” – Speaker at the conference organized by the Portuguese Arbitration Association (Lisbon, Portugal) (2024).
“How to become the ‘ideal’ international arbitration and ADR practitioner without losing your mind” – Speaker at the 2024 ICC Global YAAF (New York, USA) (2024).
“New IBA Guidelines on conflicts of interest in international arbitration” – Speaker at a joint event of ICC YAAF and CEIA-40 (Madrid, Spain) (2024).
Interview featured in Young ICSID Profiles Part Eight – Focus on Europe, available at https://icsid.worldbank.org/about/young-icsid/profiles/part-eight.
Author of “A Sentença Arbitral (Perspetiva Portuguesa)” in C. Monteiro Pires et al. (ed.), Arbitragem 2 Mundos – Diálogos entre o Brasil e Portugal, Vol. I (2024).
Author of “Privilege and Confidentiality in Document Production: The Clash Of Civilizations?”, in C. González-Bueno (ed.), 40 under 40 in International Arbitration 2024.
“Strategic composition of the arbitral tribunal” – Speaker in ARBinBrief Season 3, Episode 8 (2024).
“National Security and International Arbitration” – Speaker at the 10th Harvard International Arbitration Conference (Boston, USA) (2024).
“Arbitraje en la Torre de Babel: ¿Arbitrar en inglés o español?” – Speaker at the joint event between ALARB and CEIA (2024).
Lecturer at the Curso Intensivo de Árbitros, organized by the Portuguese Arbitration Association and the Centro de Arbitragem Comercial (Lisbon, Portugal) (2023).
“Procedimientos paralelos en el arbitraje: tribunales internacionales, jueces y organismos de control” – Speaker at the Colombia Arbitration Week (2023).
“Árbitro de Emergencia y Arbitraje Abreviado” – Speaker at the Congreso del Comité Colombiano de Arbitraje (2023).
“Ideas to improve the document production phase of the international arbitration process” – Speaker at the 38th ICC SIA QML Annual Joint Symposium of Arbitrators (Paris, France) (2023).
“Arbitral experiences and trends in international and domestic arbitration in the energy sector” – Speaker at the seminar organized by Watson Farley & Williams (Madrid, Spain) (2023).
Lecturer at the Curso Breve de Direito da Arbitragem, organized by ELSA and Universidade de Lisboa (Lisbon, Portugal) (2023).
“When investment and commercial arbitration collide” – Speaker at the IBA Arb40 Symposium (Lisbon, Portugal) (2023).
“In the future of arbitration… what to change and what to maintain” – Speaker at the event organized by the Comissão Futuro of the Centro de Arbitragem Comercial (Lisbon, Portugal) (2023).
“La cultura jurídica y la lengua como punto de encuentro del arbitraje” – speaker at the Jornada sobre Arbitraje Internacional en Iberoamérica (Madrid, Spain) (2022).
“Arbitral Parents” – Moderator of the panel organized by the Under 40 section of the Club Español del Arbitraje (CEA-40), Equal Representation in Arbitration and Women Way in Arbitration (2022).
“Public policy and foreign obstacles to the arbitral proceeding” – Speaker at the 5th edition of the Seminario Alpestre of the Swiss Chapter of the Club Español del Arbitraje (2022).
“Cultural elements in the organization of the arbitral procedure” – Speaker at the XIII Conferencia Latinoamericana de Arbitraje (Montevideo, Uruguay) (2022).
“Legitimate Expectations in Domestic Legal Systems and Public International Law” – Moderator of a webinar organized by the American Society of International Law (2022).
“Arbitration: A return to normality” – Speaker in an event organized by ICC YAF (Lisbon, Portugal) (2021).
“The Arbitration Agreement and its impact on the proceedings” – Speaker at the 5th Advanced Seminary on Arbitration of ICC Portugal (Lisbon, Portugal) (2021).
Co-Author of “Conflicts of Interest in the Code of Best Practices in Arbitration Published by the Spanish Arbitration Club”, BCDR International Arbitration Review 6, no. 1 (2019), pp. 67-92.
“ICC YAF: Administrative Secretaries: Role, duties, and challenges” – Speaker in a webinar organized by ICC YAF and YCAP – Young Czech Arbitration Professionals, ICC Prague Arbitration Day (2021).
Lecturer at the Curso de Formação Avançada em Arbitragem Internacional Lusófona, organized by Almedina (2021).
“Surviving and succeeding as a junior arbitration lawyer: Tales from the frontline” – Speaker in a webinar organized by ICC YAF and London VYAP (2020).
“Joint Treaty Interpretations by States before or during the Dispute” – Speaker in the 3rd Edition of the Encontro de Arbitralistas Lusófonos, Paris Arbitration Week (2020).
Co-Author of “The Armesto Schedule: a Step Further to a More Efficient Document Production”, Kluwer Arbitration Blog, (April 4, 2020).
“Arbitraje en Tiempos de Pandemia: Best Practices” – Speaker in a webinar organized by the Under 40 section of the Club Español del Arbitraje (CEA-40) (2020).
“Arbitral Awards: The Brazilian Tool Kit” – Speaker at the 2nd Brazilian Arbitration Forum (Paris, France) (2019).
“The French Supreme Court – the Cour de cassation” – Guest lecturer in the Litigation I class of the LLB of IE University (2019).
“Revisiting the Redfern Schedule” – Workshop at the 7th ICC YAF Global Conference (Organized by ICC YAF) (London, United Kingdom) (2019).
“Financiación de terceros y asignación de costas” – Speaker at an event organized by the Under 40 section of the Club Español del Arbitraje (CEA-40), (Spain) (2019).
“Construir o futuro da Arbitragem Internacional: mais ou menos…” – Speaker at the Under 40 Meeting at the VIII Encontro Internacional de Arbitragem de Coimbra (Portugal) (2018).
“Overview of the tribunal secretary’s tasks and role in the organization of the proceedings” – Speaker at the ICC Institute Training for Tribunal Secretaries (Organized by the ICC Institute of World Business Law) (Brazil) (2018).
“Hot topics” – Speaker at the II Encontro do CEA-40 in Portugal (Organized by the Club Español de Arbitraje, Under 40) (Portugal) (2018).
“Due Process Paranoia” – Speaker in the panel “O devido processo legal e o controle judicial das sentenças arbitrais (reconhecimento e anulação)” at the XVI Congresso Internacional de Arbitragem (Organized by the Brazilian Arbitration Committee) (Brazil) (2017).