SIGMA 5 is the direct response to national needs for large‑scale and highly complex projects. “The Engineering that ADDS UP” reflects our commitment to delivering real value, providing tangible benefits for leaders of strategic sector investments.
About us
By bringing together five leading companies—A400, DDN, GIBB, PROSPECTIVA, and TABIQUE—we combine skills, experience, and innovation to form a robust and collaborative structure. For decision‑makers, this means access to a multidisciplinary team capable of responding quickly and with technical rigor to large‑scale projects, reducing risks and improving predictability of outcomes.
SIGMA 5 stands out for its ability to manage large and complex contracts, ensuring integrated and efficient solutions for high‑impact investments. Our approach, built on transparency and good‑faith negotiation, guarantees clear processes, informed decisions, and full alignment with client objectives.
Choosing SIGMA 5 means opting for a strategic partnership that offers:
- Proven technical excellence: precision and quality in all project phases.
- Innovation capacity: creative solutions for complex challenges.
- Collaborative management: integration of diverse skills and experience.
- Risk reduction: robust structure and transparent processes.
- Value maximization: a holistic approach that transforms investment into concrete results.
Partners
A400
Over the years, A400 has turned challenges into opportunities, standing out for its boldness in embracing change and expanding beyond borders. The creation of the SPM (Synchronized Project Management) software and the implementation of BIM methodology reflect its ongoing commitment to innovation and excellence, positioning the company at the forefront of the sector. The establishment of dedicated R&D and Sustainability departments demonstrates its ability to anticipate market needs and deliver integrated solutions. Every achievement stems from the collaborative spirit of its teams and supports a future marked by growth and success.
DDN
With over 30 years of experience, DDN is recognised for creating value in its clients’ projects, combining innovation, rigour and adaptation to change.
Our commitment to BIM technology and Modular Construction project management reflects a strong commitment to future-oriented solutions. The Value Engineering service allows for the optimisation of performance, cost and sustainability. The integration of Artificial Intelligence tools and the Autodesk Construction Cloud platform into our services reinforces excellence in project management.
With over 40 IPMA-Certified Managers, qualified teams and several awards, DDN upholds its vision of a sustained and innovative growth.
GIBB
GIBB is a Portuguese consulting and design company with recognized national and international presence. Particularly significant over the last decade has been its expansion across the African continent and the strategic partnerships it has developed with some of the largest and most influential local and regional engineering companies.
PROSPECTIVA
Prospectiva is an engineering consulting firm with over 45 years of experience in the preparation of studies and projects, as well as in the management and coordination of ventures, health and safety coordination, environmental management, and general quality management.
TABIQUE
Tabique, established in 1997, is an engineering firm specializing in supervising and managing complex, large-scale infrastructure projects. With presence in more than 10 countries and 3 continents, it operates in demanding and multicultural contexts supported by highly qualified Portuguese engineering teams.
Client relationships are central and built on trust, transparency, and close engagement—treating each project as a priority. Their approach prioritizes technical rigor, meeting deadlines, cost control, and risk mitigation, ensuring high standards of quality and reliability.