+34 91 599 96 28

Sonia juanis portillo


Sonia Juanis Portillo, partner of the firm.

She has been a practising labour lawyer since 2002, member of the Madrid Bar Association, member of Asnala and recognised in the international legal directory Best Lawyers, among the best lawyers in Spain in labour law.

She intervenes in the Social Jurisdiction throughout Spain in the preparation and defence of all types of claims in disciplinary matters, termination of employment contracts, claims for rights, reduction and adaptation of working hours, claims for payment, subcontracting of works and services, company successions, social security, prevention of occupational hazards and any other matter within the aforementioned jurisdiction, as well as in the Contentious-Administrative Jurisdiction.

Attendance at conciliation and arbitration proceedings and mediations, in individual and collective matters, and at labour inspections.

Institutional relations with the General Treasury of the Social Security, SEPE, Foreigners’ Office and Labour Departments.

Labour advice to large companies, preparation of legal reports, legal support, drafting of letters and communications between companies and workers, as well as labour audits of entities in expansion processes in the service, consultancy, construction and metal sectors.

Supervision of trade union election processes and preparation of claims against the acts derived therefrom; assistance and advice in collective bargaining processes as well as preparation and processing of temporary and definitive employment regulation files and modification of collective conditions.

Providing training in labour and social security matters to human resources, personnel and labour relations managers for the development of their activity and participation in different publications such as the Wolters Kluwer legal yearbook.

Relations with trade unions, especially the Trade, Hotel and Catering and Metal Federations.

In 2002 he began to provide his services in a labour law firm which in 2018 was integrated as a whole in a multidisciplinary firm of national scope, resuming the activity of the firm specialising in labour and social security law in 2021, constituting the current firm.


Law degree from the University of Alcalá de Henares.

Master’s Degree in Employment Law and Aranzadi Award.