Ingénieur/e Cryptologue - Défense & Sécurité

About the Position

Reinforce your skills in cryptography and post-quantum cryptography (PQC) by joining our Defense & Security team in Le Plessis Robinson, France. This role is focused on helping clients transition to post-quantum cryptography (PQC) and aligns with ANSSI and international standards.

Responsibilities

Accompany clients in their transition to post-quantum cryptography (PQC).
Perform maturity diagnostics and map cryptographic usages, dependencies, and risks.
Define migration strategies and roadmaps, integrating crypto-agility and hybrid approaches.
Conduct awareness, training, and decision-making workshops for clients.
Provide technical contributions to cryptographic solution integrations, tests, PoCs, validations, and evaluations.
Maintain active vigilance on NIST, IETF, ETSI, and ANSSI standards and recommendations.
Disseminate best practices in PQC and crypto-agility internally and to clients.

Requirements

Cryptography: AES, RSA, ECC, SHA, MAC, signatures, and encryption.
PQC & crypto-agility: KEM, PQC signatures, hybridization, and NIST standards.
Security & protocols: TLS/HTTPS, PKI/X.509, HSM, PKCS#11.
Development & systems: C/C++, Python, Linux, OpenSSL, and cryptographic libraries.
Standards & compliance: ANSSI, NIST, IETF, and ETSI recommendations.

Qualifications

Graduated from an engineering school specialized in cryptography and PQC.
Mastery of cryptography fundamentals, secure PKI/protocols, and post-quantum mechanisms.
Comfortable with standards and recommendations (NIST/IETF work and ANSSI recommendations related to PQC transition).
Recognized experience in these areas, strong analytical mind, rigor, and synthesis ability, with a structured approach to complex issues.

We Offer

An enriching employee experience, supported by a work environment designed to promote flexibility, autonomy, and well-being.
A comprehensive onboarding process to onboard each talent from day one and an Academy to develop your skills, enrich your expertise, and build career paths that suit you.
A strong societal commitment: over 3,000 supported associations, an active disability policy, an inclusive culture, a responsible digital approach, and partnerships like Elles bougent to inspire tomorrow's female talents. -...and many other benefits to discover by joining us!

About the Company

CS, a subsidiary of the Sopra Steria group, is a leading technology player in the design, integration, and operation of critical systems. Present in 7 countries with over 2,600 passionate employees, we intervene at the heart of sovereignty, security, and performance issues, in strategic sectors such as defense, space, energy, industry, transport, aeronautics, and cybersecurity.

Our difference? A unique expertise in real-time systems, sovereign and sustainable solutions, and a strong culture of innovation, driven by 15% of our revenue invested in R&D. We support our clients in the success of their most complex programs, from air traffic control to anti-drone warfare, through nuclear systems and satellite control centers.

By joining CS, you become part of a human and innovative company.

We deliver much more than systems, we build trust.
We go beyond expressed needs, we prepare for tomorrow's challenges.
More than simple experts, we shape innovation.

Protecting territories, anticipating threats.

Our Defense & Security Business Unit is at the heart of national sovereignty issues. With over 800 employees spread across the country, it designs critical systems for the army and civil aviation. Our teams work on high-value projects: tactical data links, anti-drone warfare, maritime surveillance, simulation and training, air security. Thanks to our expertise and our commitment to international programs, we actively contribute to the security of territories.

Joining this Business Unit means contributing to the protection of citizens within a committed collective.

Application Process

If your profile matches, you will be invited to an interview with an operational manager to discuss your skills and your vision of the profession. You will then meet Dylan, the recruitment officer, for an exchange about your background, your aspirations, and our company culture.

Finally, because we value transparency and respect, we commit to giving you a personalized feedback by phone, whatever the outcome of the process.

#CS #PQC #Cryptography

Inclusive and committed employer, our company works every day to fight against all forms of discrimination and to promote a respectful work environment. That's why, attached to diversity and mixity, we encourage all applications and all profiles.

Learn more about our commitments