Sthenos AI is the AI developer of EFA Group, building intelligent, mission-ready solutions for defense and aerospace. With deep expertise in Command-and-Control (C2), cyber defense, computer vision, and autonomous systems, we design and deploy secure, field-proven AI that enhances operational efficiency and situational awareness. As part of a leading European defense ecosystem, we bring scalable innovation where it matters most — in the theater of operations.
As a Quantum Cryptography Engineer you lead the implementation, integration and continuous improvement of cryptographic capabilities at Sthenos AI for defense and dual-use applications. You support secure software delivery, FIPS-oriented validation work and collaboration with internal teams, external partners and quantum technology specialists
Your Tasks
- You lead the secure implementation and review of cryptographic modules for defense and dual-use software systems.
- You implement cryptographic primitives and security-critical components/
- You support the implementation of FIPS-approved algorithms and protocols, including validation and certification activities.
- You drive iterative hardening, optimization, refactoring and long-term maintenance of cryptographic components.
- You contribute to the integration of PRNGs, TRNGs, PQC algorithms and QKD-related protocols into our security stack.
- You collaborate with software, systems and security teams to translate operational requirements into robust implementations.
- You perform cryptographic code reviews and security assessments and propose practical improvements.
- You contribute to technical documentation covering architecture, testing, validation evidence and operational use.
- You participate in EDF calls, proposal-related activities and technical meetings.
- You work closely with a Quantum Technologies Specialist and other domain experts on quantum-related security objectives.
- You stay current with applied cryptography, implementation techniques, attack models and evolving standards.
Your Skills
- MSc or equivalent advanced degree in Cryptography, Computer Science, Mathematics, Electrical Engineering, Cybersecurity or a related field.
- Significant professional experience in applied cryptography, with strong focus on secure implementation and engineering review.
- Deep knowledge of modern cryptographic primitives, including encryption, hashing, signatures, key exchange, KDFs and randomness generation.
- Strong hands-on experience developing security-sensitive software.
- Experience implementing FIPS-approved algorithms and protocols.
- Experience supporting validation and certification oriented development.
- Familiarity with PRNGs and TRNGs in security-critical systems.
- Good practical understanding of PQC-related algorithms and implementation considerations.
- Awareness of QKD-related protocols and their operational integration challenges.
- Familiarity with MBSE and secure SDLC practices is highly advantageous.
- Eligibility to acquire EU and/or NATO security clearances is mandatory.
Your Competencies
- Implementation-driven mindset, able to translate advanced cryptographic theory into robust software.
- Strong ownership and leadership skills; you can guide complex technical workstreams across teams.
- High rigor and attention to detail when working on security-critical code and certification-oriented deliverables.
- Excellent communicator, with the ability to explain effectively the tradeoffs of different cryptographic solutions to a variety of technical and non-technical audiences.
- Collaborative approach to working with software engineers, systems engineers, security specialists and quantum technology experts.
- Ability to operate effectively in high-assurance, defense-related environments with evolving requirements.
- Curious and adaptable, with the drive to continuously improve cryptographic components over time.
We Offer
- Competitive remuneration package
- Private medical insurance package
- Continuous learning & development opportunities
- Participation in cultural and team-building activities
- Exposure to a growing environment with cutting-edge technologies
- Corporate wellness initiatives