These Spanish engineering services companies are mostly large, established firms. Tecnicas Reunidas, founded in 1960, specializes in industrial facilities for oil & gas and power generation. IDOM Consulting, Engineering, Architecture, founded in 1957, provides consulting and engineering services. Sener, established in 1956, offers solutions across aerospace, energy, and mobility. TYPSA, from 1966, focuses on civil engineering and environmental projects. ISDEFE, founded in 1985, offers consulting and engineering for government challenges. DF-Duro Felguera, dating back to 1858, executes EPC projects in energy and industrial sectors.
The data shows a concentration of headquarters in the Madrid area, including Madrid, San Sebastián de los Reyes, and Getxo. The companies listed were predominantly founded between the 1950s and 1980s, indicating a mature sector.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
Tecnicas Reunidastecnicasreunidas.es
An international general contractor specializing in engineering and construction of industrial facilities in oil & gas, refining, power generation, infrastructures, and energy transition |
12,368 | |||
| 2 |
IDOM Consulting, Engineering, Architectureidom.com
A multinational consulting, engineering, and architecture firm offering personalized client services, delivering independent, impartial global projects with a diverse, engaged workforce |
5,424 | |||
| 3 |
Senergroup.sener
Responds to demanding challenges with innovative, efficient solutions, advancing society across aerospace, defense, energy, mobility, data centers, and digital sectors for 70 years. |
4,878 | |||
| 4 | 2,755 | ||||
| 5 | 1,732 | ||||
| 6 |
DF-Duro Felgueradurofelguera.com
Execution of turnkey EPC projects and services in energy, industrial sectors, including renewable energies, mining, oil, gas, and digital security. |
1,325 | |||
| 7 |
EAG (Empresarios Agrupados - GHESA)empresariosagrupados.es
A leading European engineering group with expertise in complex projects, operating internationally with a large workforce and significant turnover |
1,161 | |||
| 8 |
Eptisaeptisa.com
A multinational company specializing in engineering, consultancy, information technologies, and social development with a focus on sustainable solutions and client satisfaction |
1,155 | |||
| 9 |
Apave Spain (antes Eurocontrol)eurocontrol.apave.com
EUROCONTROL provides a wide range of quality control and engineering services for industrial materials, equipment, and plants, including civil engineering projects |
1,030 | |||
| 10 |
INERCOinerco.com
Provider of comprehensive services and advanced technologies for sustainable industrial development, specializing in emissions reduction, energy efficiency, renewables, and environmental consulting globally |
852 | |||
| 11 |
Sampolsampol.com
A multinational, family-owned company founded in 1934, specializing in energy projects, electrical installations, telecommunications, and control systems for various sectors globally |
763 | |||
| 12 |
EOSOLgrupoeosol.com
A multinational group of service companies specializing in energy project development, photovoltaic plant operation, engineering services, and automation system design and manufacturing |
732 | |||
| 13 |
IDEAideatsg.com
Company specializes in engineering, integrating new technologies for industrial digitization, with a focus on BIM methodology and digital twins, working across various sectors nationally and internationally. |
673 | |||
| 14 |
Excelticexceltic.com
A European engineering and consulting firm offering services in civil, electronic, and mechanical engineering, as well as IT & Telecommunications, with a focus on excellence and customer satisfaction |
555 | |||
| 15 | 550 | ||||
| 16 |
GDES | Grupo Dominguis Energy Servicesgdes.com
Provision of industrial services including operations, maintenance, decommissioning, surface treatment, logistics, energy efficiency, and digital transformation for diverse energy sectors. |
535 | |||
| 17 |
BOSLAN Ingeniería y Consultoríaaccenture.com
Specializing in offshore wind energy, renewable energies, green hydrogen, and retail, we offer integrated management systems and a skilled team for comprehensive project solutions |
534 | |||
| 18 |
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 | |||
| 19 | 464 | ||||
| 20 |
COMSA Servicecomsaservice.com
A multidisciplinary company specializing in maintenance, energy efficiency, building management, technical assistance, and ornamental fountain design, construction, and conservation |
450 | |||
| 21 |
Grupo ALUMANgrupoaluman.com
Global leader in architectural envelopes for unique projects, providing design, engineering, manufacturing, and project management services with focus on innovation and sustainability |
448 | |||
| 22 |
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 | |||
| 23 |
ONDOANondoan.com
Offers comprehensive engineering, installation, and maintenance services, specializing in industrial, environmental, energy, and fire protection solutions for diverse clients. |
400 | |||
| 24 |
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 | |||
| 25 | 387 | ||||
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. | |||||
| 26 |
SATELsatel-sa.com
SATEL is an international group providing engineering services since 1988, trusted by energy and telecom companies, expanding globally since 2011 |
379 | |||
| 27 |
ROADISroadis.com
A global leader in developing, operating, and managing essential infrastructure assets, managing toll roads in Brazil, Mexico, India, Portugal, and Spain |
339 | |||
| 28 | 202 | ||||
| 29 |
EKIUM CPQcpqingenieros.com
Creating a group to keep employees, collaborators, and clients informed about news, projects, and updates Also used to track annual goals and foster connections |
196 | |||
| 30 |
INGENORingenor.com
A group of companies offering professional services in Engineering, Architecture, and Project & Construction Management |
182 | |||
| 31 | 181 | ||||
| 32 |
M47 - AI Companym47labs.com
The company advances Natural Language Processing (NLP) to automate complex processes and drive innovation, providing effective business insights |
177 | |||
| 33 |
Nadico - Ingeniería, Arquitectura, Consultoría -nadico.net
Specialized company providing technical services in engineering, architecture, and industrial consulting |
172 | |||
| 34 | 172 | ||||
| 35 |
Enginyers Industrials de Catalunyaeic.cat
Professional association supporting over 10,000 engineers in Catalonia with a range of services for personal, professional, and family needs, including professional liability coverage |
168 | |||
| 36 |
Vestel Ingenierosvestelingenieros.com
A multidisciplinary team specializing in electrical and energy engineering projects, providing tailored solutions to ensure customer satisfaction and loyalty through efficient project management |
160 | |||
| 37 |
Adasoftadasoft.com
A technology company specializing in digitizing industries like pharmaceuticals, food & beverage, and process industries worldwide with advanced solutions |
158 | |||
| 38 |
Techno Pro Hispaniatphispania.com
Techno Pro Hispania offers engineering expertise for industrial systems, specializing in Naval, Industrial, and Energy sectors They provide production management solutions and proactive project support |
158 | |||
| 39 |
GABITEL INGENIEROSgabitel.net
Specialized in telecommunications engineering, agro-food engineering, and software development Known for project execution expertise and skilled workforce |
155 | |||
| 40 |
Nordés ancínnordesancin.com
Nordés Ancín is an engineering company specializing in the design, installation, and maintenance of HVAC, ventilation, heating, refrigeration, and electrical systems with a focus on quality, innovation, and environmental sustainability |
152 | |||
| 41 |
Sisenersisener.com
Specializing in engineering services in the field of electric energy generation, transmission, and distribution, with a strong focus on renewable energy projects |
152 | |||
| 42 |
FEV Iberia SLfev.com
A globally recognized leader in designing and developing internal combustion engines, vehicle propulsion systems, alternative energy technology, instrumentation, and testing services |
150 | |||
| 43 |
bisbis211.com
An engineering firm based in Barcelona specialized in structural design for healthcare, educational, and sports facilities, with over 3000 projects worldwide |
149 | |||
| 44 |
INGEDETEC GROUPingedetec.com
An international engineering company specializing in automotive, railway, and aerospace projects, providing engineering services, technical solutions, and electrical system development |
127 | |||
| 45 | 122 | ||||
| 46 |
AIN ACTIVE SLain-active.com
AIN active is an energy engineering and civil engineering company that designs, projects, and operates infrastructures worldwide, specializing in consulting, industrial buildings, and infrastructure projects |
118 | |||
| 47 | 104 | ||||
| 48 |
ALOR-techalor-tech.com
Human engineering, placing humans at the center of innovation, and talent as the driving force |
95 | |||
| 49 |
Piedrafitapiedrafita.com
Develops engineering expertise and high-value solutions for vehicle engineering and land platforms, specializing in steering, suspension, electro-hydraulics, and electronics, particularly for defense and motorsport sectors. |
94 | |||
| 50 |
Malena Engineering S.Lmalena-eng.com
An independent consulting firm in Spain offering engineering services, software development, and management with a focus on high technical expertise and customer satisfaction |
63 | |||
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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 12, 2026.
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