About us


    With 12 lawyers entirely dedicated to the employment relationship, CASTEGNARO advises employers in their daily HR management and assists them in case of litigation.

    Our legal advices are rendered in Luxembourgish, English, German, French and Italian. 

    The firm's activities cover all aspects of national, European and International employment law as well as corporate, tax and commercial law matters as far as they are directly or indirectly linked to employment law matters.

  • Our Expertise

    The Human Resources field becomes more complex every day. That is why we are convinced that only a firm specializing in labor law and social law can effectively deal with all aspects related to HR.

    CASTEGNARO is the privileged and natural interlocutor of the HR and internal lawyers, of any company occupying employees, for pragmatic, fast and effective solutions.

    Our participation in the creation of the Luxembourg Labor Code has further strengthened this expertise.

    We guarantee an integrated approach, taking into account all the legal aspects related to the problems encountered by our clients.

  • Our Corporate Culture

    CASTEGNARO has an active international presence, especially through Ius Laboris, however the size of the firm, in no way, compromises the friendly atmosphere, where interaction is encouraged.

    All of our lawyers fulfil their roles ethically and independently, with the supervision of more experienced lawyers, as mutual support is a key value within the firm. 

    Every single employee, whether a lawyer or a member of the administrative staff, is an ambassador for the firm, and personally responsible for its values, which include in particular the following:

    • Mutual respect and confidence;
    • Ethics;
    • Communication and team spirit;
    • Work-life balance;
    • Personal commitment;
    • Diversity.

    The firm has been proactively committed to Corporate Social Responsibility (CSR) and Sustainable Development since it was founded and takes into account social, environmental and economic issues in its day-to-day running.

    The responsible working environment that the firm strives to develop and maintain helps to consolidate teamwork and boost performance.


  • Our Approach

    Our firm strives to take a pragmatic approach, so that it can be a genuine partner for HR and Legal departments, in day-to-day human resources management.

    CASTEGNARO always stands out from other firms in Luxembourg ensuring, for over ten years, the defense of the interests of employers (companies, associations, ministries and administrations).

    This choice allows us to develop and offer curring-edge legal services to meet our clients' needs,  with out-of-the-box as well as customised solutions, in increasingly more restricted formats and deadlines. CASTEGNARO is always listening to its clients, and is committed to taking a pragmatic approach in step with the latest legal developments, so that our customers can be sure they will get a constructive response to their question.

    Our clients benefit from the know-how of our lawyers through additional services such as publications, newsletters, newsflashes, seminars and in-house trainings.


  • Our History

    CASTEGNARO stared in 2004 with 5 lawyers and numbers today 12 lawyers and 2 paralegal who work close together on an equal footing, to offer creative solutions and excellence to our clients.

    CASTEGNARO is proud to have established itself over the last years in the Luxembourg landscape as the only law "niche" firm in labor law, that is to say highly and exclusively specialized in all the legal aspects of the employment relationship, both in the strict sense of labor law (employment contracts, working time, termination, transfer of business, social plans, collective agreement renegotiation of labor, etc.), that broadest sense (protection of personal data, social security, immigration, etc.).


  • Awards & Recognition

    The Europen Legal 500:  

    The Legal 500 (2018): Castegnaro, member of Ius Laboris regularly advises clients on the employment issues associated with business reorganisations including instances which involve redundancy processes as a result of the relocation of activities to another country. The ‘very knowledgeable’ Guy Castegnaro and Ariane Claverie are the principal contacts and Christophe Domingos is ‘excellent at implementing staff reduction plans’.            

    The Legal 500 (2017): "Boutique employment firm Castegnaro, member of Ius Laboris regularly receives referral work from leading international law firms as well as handling direct instructions. Recent highlights include assisting a major steel producer with the review of an appendix to its collective bargaining agreement concerning the new career and salary development programme, and advising a multinational company on the compliance review of an e-monitoring policy. Guy Castegnaro and Ariane Claverie are recommended.

    The Legal 500 (2016) : "Jointly led by founding partner Guy Castegnaro and Ariane Claverie, boutique employment firm Castegnaro, member of Ius Laboris has a good pedigree in the market acting for employers across a range of matters, including on issues relating to transfers of undertakings and dismissal procedures. Castegnaro recently assisted a large IT company with implementing a voluntary leave programme".

    The Legal 500 (2015) highly recommends CASTEGNARO, which is placed in the top rank:

    "Guy Castegnaro and Ariane Claverie lead the highly experienced team at boutique employment firm Castegnaro, member of Ius Laboris. The firm works exclusively on the employer side, handling matters such as collective dismissals, restructuring and employment litigation.

    The Legal 500 (2014): "Employment law boutique CASTEGNARO, member of Ius Laboris is a widely recognised leader in the filed, thanks to the talents of the "excellent" Guy Castegnaro and the "huge knowledge" of Ariane Claverie. The firm exclusively defends employers, for instance advising international banks and mutlinational companies on collective dismissals. The firm enjoys good links with a range of leading international law firms. (2014)

    The Legal 500 (2013): "CASTEGNARO, member of Ius Laboris, is widely recognised for its exclusive representation of employers. Examples of this include acting for the Luxembourg branch of a major international banking group in relation to a collective dismissal procedure and the establishment of a social plan. Guy Castegnaro has a formidable reputation. The firm is also a member of the international employment law alliance ius laboris." (2013)

    The Legal 500 (2010): "CASTEGNARO, member of Ius Laboris, is widely recognised for its exclusive representation of employers. Examples of this include acting for the Luxembourg branch of a major international banking group in relation to a collective dismissal procedure and the establishment of a social plan. Guy Castegnaro has a formidable reputation. The firm is also a member of the international employment law alliance ius laboris." (2010)

    Chambers & Partners:

    Our Firm is continuously ranked in Band 1 by Chambers & Partners.

    Chambers & Partners 2018

    What the team is known for  Specialist employment boutique known as one of the most eminent labour law practices in Luxembourg. Advises top-flight clients on complicated employment matters such as large-scale collective bargaining agreements, cross-border relocations, corporate restructuring and transfer of undertakings. Also represents clients in court on labour disputes. Member of the international employment law network Ius Laboris.

    StrengthsClients highlight the firm's "depth of resources" in employment law as a strength, as well as the team's "fair approach to billing" and its "client focus."

    Sources agree that "they are experts in employment" who are "well known in the local market."

    Notable practitioners

    Founding partner Guy Castegnaro has a long-standing reputation in the Luxembourg employment law space for advising clients on a wide range of issues including both contentious and non-contentious labour law matters. Sources describe him as "recognised as an expert in the field."

    Clients appreciate Ariane Claverie's impressive knowledge and her "quick, efficient" approach. She offers a broad employment practice, advising on terminations, working hours and social security among other matters. Claverie's increasing market profile and her activity in the labour law space have contributed to her promotion to Band 2 this year.

    Chambers & Partners 2017: " Boutique practice specialised in employment law. Exclusively represents employers, advising on all arising issues including related litigation. Well placed to support multinational clients on matters in Luxembourg as part of international alliance Ius Laboris. Notable presence within the financial, transportation, food and drinks sectors. 

    The firm is appreciated for its "excellent service, accuracy of response, knowledge and track record."

    Another source adds: "It is always a pleasure to work with Castegnaro. They are efficient, to the point and always provide different options with the pros and cons of each.

    Clients note: "They are among the most competitive in the market, while maintaining a high quality of service."

    Chambers & Partners 2016: "As a firm it is always listening, always giving advice. It is like a business partner." Head of department and firm founder Guy Castegnaro advises clients on both contentious and non-contentious employment matters. He also sits as chair of the European Employment Lawyers Association and speaks at various employment law conferences. 

    Chambers & Partners 2015:  "Specialist employment boutique advising public and private entities at both a national and international level. Scope of expertise covers both contentious and non-contentious employment matters, including collective dismissal procedures and bargaining agreements, data protection and immigration. Name partner Guy Castegnaro leads the firm's employment practice and is a founding member of legal network Ius Laboris. He remains an active figure in the Luxembourg market.

    Chambers & Partners 2014: A solid, higly specialised team, which does a great job. Strong, domestically focused team, known for the extensive activity with private sector employers, such as hospitals, retailers and transport companies. Offers expertise across employment, including immigration and company law latters, litigation, restructurings and transfger of undertakings. Guy Castegnaro "is one of the top people" in Luxembourg for employment.

    Chambers & Partners 2013:  €œThis fully specialised outfit is undeniably a top contender for employment law. Its founder, Guy Castegnaro, is a dedicated, long-standing employment lawyer whose decision to form his own boutique in 2004 has paid dividends in a relatively short space of time. The team of six lawyers covers all aspects of human resources, ranging from individual dismissal cases to collective labour issues. The full complement of company-side services also includes employee benefits and executive compensation, social security and data protection.

  • Associations memberships

    European Employment Law Association - EELA

    International Bar Association - IBA

    Employment Law Specialists Association - ELSA

    Association des Banques et Banquiers, Luxembourg - ABBL

    Personnel Officers Group - POG

    Institut pour le mouvement sociétal - IMS

    Forum pour la régulation de l'Europe sociale - RegES