Senior Cryptography R&D Engineer - Post-Quantum & FPGA

CryptoNext Security SAS; Paris; Sur place; EUR 90 000 - 130 000; Plein temps

Avantages offerts par ce poste

Ownership of strategic challenge

Global PQC recognition

Paris-based role

Competitive salary

Résumé du poste

CryptoNext Security SAS in Paris is seeking a senior Cryptography R&D Engineer to lead porting of the Quantum Safe Library across platforms and hardware accelerators. You will design efficient C code for post-quantum algorithms, optimize for performance and security, and work close to hardware with embedded Linux, Cortex-M, and FPGA targets.

You bring 5+ years in cryptography engineering, a degree in CS/math (PhD a plus), strong C skills, and experience with GCC, GDB, QEMU, JTAG, and OpenSSL.

Qualifications

• Significant, senior-level experience in cryptography engineering (5+ years).
• Engineering degree or Master's in computer science, mathematics or a related field; a PhD in cryptography is a strong plus.
• Strong foundations in algorithmics and algebra with the ability to translate mathematical constructs into efficient implementations.
• Strong programming skills in C; comfortable working close to hardware and optimizing for performance and security.
• Experience with embedded development and hardware debugging tools (GCC, GDB, QEMU, JTAG) and CI with GitLab CI.
• Experience with public-key cryptography, symmetric-key cryptography, hash functions, and cryptographic protocols/frameworks such as OpenSSL is a plus.
• Experience in embedded software development, hardware/software co-design, FPGA implementation.
• Good French & English communication skills, both oral and written.

Responsabilités

• Design and implement efficient C code for post-quantum cryptographic algorithms, balancing performance, portability and security.
• Port and optimize the CryptoNext Quantum Safe Library (C-QSL) across multiple platforms and architectures.
• Adapt implementations for constrained and embedded environments (e.g., IoT, Cortex-M, embedded Linux).
• Define and run test and validation strategies (functional, performance, security) across all target platforms.
• Support security certification processes (CSPN, Common Criteria, FIPS) for the ported implementations.
• Document your work through technical reports and, where relevant, scientific papers.
• Collaborate closely with the R&D team and cross-functional teams to solve complex technical challenges.

Connaissances

Cryptography engineering

C programming

Embedded development

Hardware debugging tools

GitLab CI

OpenSSL knowledge

Public-key cryptography

French & English skills

Formation

Engineering or Master's in CS/Math

PhD in cryptography (strong plus)

Outils

GCC

GDB

QEMU

JTAG

Description du poste

CryptoNext Security SAS in Paris is seeking a senior Cryptography R&D Engineer to lead porting of the Quantum Safe Library across platforms and hardware accelerators. You will design efficient C code for post-quantum algorithms, optimize for performance and security, and work close to hardware with embedded Linux, Cortex-M, and FPGA targets.

You bring 5+ years in cryptography engineering, a degree in CS/math (PhD a plus), strong C skills, and experience with GCC, GDB, QEMU, JTAG, and OpenSSL.