These Barcelona-based professional services firms are mostly large and mid-sized companies, with a focus on IT services, business consulting, and legal practices. For example, SEIDOR helps clients with technology and innovation, while Cuatrecasas is an international law firm. Nada specializes in interior architecture and design, and MAGMACULTURA, S.L. offers cultural management solutions. Profesional Idependiente provides coaching psychology services, and OTRA COSA offers expert judicial opinions.
A notable pattern among these companies is their specialization in various professional services, with a strong presence of IT consulting firms like Capitole and Between Technology, and human resources specialists such as Grupo Constant and SYNERGIE ESPAÑA. Many of these firms were founded in the 1990s and early 2000s, indicating a period of growth in the professional services sector in Barcelona.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
SEIDORseidor.com
Helps clients transform and compete through technology and innovation, focusing on human values, sustainability, and partnering with leading tech innovators globally. |
8,352 | |||
| 2 |
Nadaestudionada.com
An interior architecture and design studio based in Barcelona and Valencia, creating honest, pure, and timeless spaces with a focus on sustainability and functionality |
3,790 | |||
| 3 |
Cuatrecasascuatrecasas.com
An international law firm with expertise in business law, serving clients across Spain, Portugal, Latin America, and beyond with a diverse team of over 1,900 professionals |
2,540 | |||
| 4 | 
Profesional Idependientecp-barcelona.com
The company offers Coaching Psychology services for individuals, Supervision for coaches and psychologist coaches, and promotes health and leadership competencies |
2,152 | |||
| 5 |
MAGMACULTURA, S.L.magmacultura.com
MagmaCultura brings together experienced professionals to offer cultural management solutions that optimize resources for tourism, education, and heritage preservation |
1,500 | |||
| 6 |
OTRA COSAgp-grup.com
Specialized expert judicial cabinet providing a wide range of expert opinions and reports across various disciplines in Spain Skilled judicial experts available nationwide |
1,415 | |||
| 7 |
Capitolecapitole-consulting.com
IT consulting company specializing in software development, testing, digital transformation, offering diverse projects, training, team building, and flexible benefits. |
1,248 | |||
| 8 |
Grupo Constantgrupoconstant.com
Leader in HR outsourcing, facilities, and temporary work solutions Specializing in effective, innovative services, focusing on quality, authenticity, respect, and efficiency |
1,041 | |||
| 9 |
SDG Group Españasdggroup.com
Global consulting firm specializing in Data & Analytics, transforming organizations into successful data-driven enterprises through innovative analytics expertise and solutions |
974 | |||
| 10 |
ASPY Prevenciónaspyprevencion.com
Specializing in occupational health and safety, the company offers tailored solutions to ensure compliance and promote excellence in prevention |
885 | |||
| 11 |
SYNERGIE ESPAÑAsynergie.es
A multinational company specializing in comprehensive HR services, offering temporary work, recruitment, training, and outsourcing with a strong presence in Europe and other countries |
813 | |||
| 12 |
Between Technologybetween.tech
Connecting skilled professionals with innovative engineering and IT projects worldwide, providing consulting services and fostering career development opportunities. |
759 | |||
| 13 |
Multiplicamultiplica.com
Digital consulting firm specializing in creating impactful digital experiences by utilizing cutting-edge technologies and methodologies to improve business results and user connections |
736 | |||
| 14 |
Ingenieros Emetres (Im3)ingenieros-im3.com
The company provides engineering services such as studies, design, construction management, and legalization, with a focus on multidisciplinary teams and industry trends |
672 | |||
| 15 |
Forvis Mazars in Spainforvismazars.com
An international firm providing audit, consulting, legal, and tax advisory services, committed to helping clients and professionals succeed while promoting trust and responsibility |
640 | |||
Want more companies than this list?This page shows the largest ones only. Connect to Tamtam to see every company that matches, filter by size, industry or growth, and reach their decision-makers. | |||||
| 16 |
Romanromanrm.com
A communication and PR agency with 30 years experience specializing in reputation management through various communication strategies in local, national, and international markets |
623 | |||
| 17 |
TYLin in Europe + LATAMtylin.com
Designs infrastructure solutions globally, connecting communities, enhancing designs, providing resilient systems, and offering sustainable solutions to client challenges. |
582 | |||
| 18 |
Human Resources by Sede21sede21.com
A global company based in Barcelona, emphasizing results, service, and sensibility in delivering its products or services worldwide |
577 | |||
| 19 | 574 | ||||
| 20 |
Diagonal Gest, SLdiagonalcompany.com
A company founded in 1997 focusing initially on mortgage management, now a leading provider of advanced financial process outsourcing services internationally |
571 | |||
| 21 |
SOCOTEC Spainsocotec.es
Offering comprehensive engineering solutions to ensure reliability, digitization, and sustainability throughout the infrastructure lifecycle, aiming to transform the world through innovative and responsible engineering |
481 | |||
| 22 |
Naenae.global
A consulting firm specializing in business strategy and efficiency for telecom, corporations, and public entities, with a focus on customer experience innovation |
458 | |||
| 23 |
Iplan Gestión Integraliplangroup-eng.com
A company offering engineering services in energy, civil works, renewable energies, and environment, with a focus on integral project execution |
443 | |||
| 24 |
Broadcastervpn.broadcaster.media
A content agency specializing in integrated communication, storytelling, audiovisual production, and journalism to help companies convey authentic, impactful messages |
438 | |||
| 25 |
Amphos 21amphos21.com
Environmental consulting and engineering company offering services in mining, nuclear, water, environment, and sustainability sectors worldwide, with expertise in hydrogeochemical modeling and R&D |
428 | |||
| 26 |
Crowe Spaincrowe.es
Global professional services provider with presence in over 150 countries and 40,000 professionals Offers tailored solutions combining international expertise with local knowledge |
405 | |||
| 27 |
Cerowearecero.com
A multidisciplinary design studio in Barcelona merging design, engineering, simulation, composite, and testing for various industries, focusing on lightweight design using cutting-edge technologies |
396 | |||
| 28 |
Winche Redes Comercialeswinche.com
Specialists in sales force outsourcing & point of sale management Increase client sales through tailored projects, product visibility improvement, cost reduction, flexibility, and expertise |
391 | |||
| 29 | 387 | ||||
| 30 |
JG Ingenieros S.A.jgingenieros.es
An independent engineering company specializing in construction, with expertise in building and electrical/mechanical installations Offers comprehensive engineering services from concept to maintenance |
384 | |||
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How this list is built
Every company on this list has a Tamtam company profile. The industry is the one the company gives on LinkedIn; categories such as SaaS or fintech are classified by Tamtam's AI from the company's website and LinkedIn page; and the headquarters city must match the company's own address. Companies are ranked by the number of employees on LinkedIn, and the list is refreshed every night. Classifications can be wrong, so treat the list as a starting point rather than an official ranking. Last updated Nov 11, 2026.
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