Critical Software

Critical Software is a leading Portuguese technology company with more than two decades of experience in the rail industry. We design and develop complex, safety-critical systems that power modern railways in the different domains as rolling stock, signalling or control-center software (ranging from condition-based maintenance applications to generic digitalization and modernization).

Our expertise spans the entire systems lifecycle, helping OEMs and integrators move from concept and design through validation, verification, and certification. Whether it’s developing SIL4-certified systems or carrying out RAMS activities, we ensure compliance with key CENELEC standards such as EN 50716 and EN 50126.

As the rail industry accelerates towards digitalisation, our turnkey projects combine software, hardware integration, and data intelligence. This enables operators to reduce risk exposure, improve operational efficiency, and enhance the safety and security of passengers and crews — all while safeguarding asset integrity and operational continuity.

Cybersecurity is built into every system we design. Following Security by Design principles from concept to deployment, our teams apply IEC 62443 and TS 50701 standards to deliver secure, resilient, and future-ready solutions.

Through our work, we’ve helped clients cut development and maintenance costs, advance sustainability goals, and support the global transition to greener mobility.