The end of the Second World War entailed the legacy of a strong alliance between Brazil and the United States. The world was reorganized and, in Brazil, economic liberalism gained strength, finally ending the “Estado Novo”, a centralized and authoritarian policy maintained by former president Getulio Dornelles Vargas. Trade between the previously allied countries intensified, and in the golden age of navigation when communication began to impose a revolution that would create a new world order, Gouvêa Vieira played an active role consulting with foreign telegraph companies and attending to the legal affairs of the three largest navigation companies existing at the time: The British Royal Mail, The French Chargeurs Reunis and The Societa Italiana di Navigazione. Gouvêa Vieira also handled the legal affairs of the port of Rio de Janeiro. However, Gouvêa Vieira’s outstanding achievement in this decade was the guidance he provided in 1945 for the incorporation of Credit Lyonnais, the first foreign-owned bank based in Brazil. This model was followed not only by all foreign banks seeking to enter the country, but also banks currently existing in Brazil. Thereafter, Gouvêa Vieira established a strong customer base of French companies operating in Brazil.

The National Bank for Economic Development (BNDE) was founded in 1952, in order to finance products related to infrastructure. Besides assisting in drafting its statute, Gouvêa Viera became member of its first Board of Directors. In order to expedite the industrialization of Brazil, President Juscelino Kubitschek launched the "Plano de Metas" (“Target Plan”) with the motto "50 years in 5". This period saw the outset of the car industry, the development of industry, and numerous construction projects. GVA was then active in all these sectors, besides providing assistance in the purchase of a subsidiary distribution network from Gulf Oil Corporation. The subsidiary was purchased by Companhia Brasileira de Petroleo Ipiranga, a company that was to become Brazil’s foremost petroleum distributor.

During this decade, when Brazilian economy was no longer predominantly rural, the country witnessed rapid urbanization, and GVA was active from the beginning of the cycle of import substitution and technology transfer. In 1962, the Profit Remittance act was passed, requiring registration of foreign capital entry with retroactive effect. GVA recovered documents for its clients that had been brought into the country during the last century, thereby enabling foreign entities to exist in Brazil. During this period, modern glass industry started, along with the development of cement and pharmaceutical industries, and the first tourist resorts began to operate. Tuned in with this prosperous expansion, not only did GVA provide services to the aforementioned sectors, but also assisted in the incorporation of Pólo Petroquímico de Camaçari, a petrochemical plant.

The result of the economic miracle during this decade was exceptional, and the GDP leaped by almost 10% a year. Brazil became the world center of investment, and foreign investment flowed heavily into the country. GVA followed alongside the changes mandated by the government, creating the legal engineering for foreign loans, furthering the subway system and the growth of insurance companies by adjusting their activities to the new laws and pointing to new business paths. GVA also took part in the financing of major state projects such as Companhia Vale do Rio Doce and Petrobrás. In the mining industry, the firm worked on legislation dealing with mining concessions.

More than ever, the corporate sector  required and relied on a legal partner, in this period of restructuring, with soaring inflation and new economic plans  and the resulting breach of contracts. Ahead of this tough environment, Gouvêa Vieira Advogados became partner in capital markets, investment banks and brokerages. The New Corporations Act counted on the firm’s contribution. GVA partner Jorge Hilário Gouvêa Vieira took part in founding the Securities and Exchange Commission as its first director (1977-1979) and then became its second president (1979-1981). The firm offered the market expertise in this segment. Banking law and the issue of securities for Brazilian companies was the big deal of the time and the most sought-after expertise of the firm. The business trend then pointed towards globalization, and GVA opened its branch in Paris under the direction of Maria Isabel Neves Garcia dos Santos Nivault. In 1994, partner Antonio Alberto Gouvêa Vieira was elected president of the French Brazilian Chamber of Commerce, remaining in this post until 1997. Partner Carlos Mafra de Laet was appointed deputy-member of the International Court of Arbitration of the International Chamber of Commerce in Paris. Lawyers comprising GVA then bestow their expertise upon the academic sector, form the administration bodies of private companies and play a significant role in the government.