Linux Systems Developer OpenSSL C

In this role you will develop and maintain secure, low-level Linux software as part of a core Linux team. You will work on Linux security mechanisms, kernel-hardening, and cryptographic technologies to strengthen the platform. You will primarily use C with Bash for scripting, contributing to design and code reviews. The role supports a path toward Common Criteria certification and requires hands-on work close to the operating system. You will collaborate with an international team, delivering robust, security-focused solutions while shaping secure software for critical customers.

• Salary up to 85k + OTE
• 25 days holiday (27 with tenure)
• Hybrid working
• Private medical care
• Life cover
• Pension

• Develop and maintain secure, operating-system level software on Linux
• tackle complex security challenges across Linux security mechanisms
• work on kernel-level hardening and cryptographic technologies
• apply security-by-design principles throughout the development lifecycle
• contribute to technical design discussions and code reviews
• strengthen OpenSSL-related capabilities and PKI/X.509 implementations
• perform debugging, testing, and automation to ensure robust software

• Strong C programming skills including debugging and memory management
• Proficiency in Bash scripting for automation and tooling
• Deep understanding of Linux (especially Debian-based) and system administration
• Knowledge of OpenSSL, X.509, and PKI fundamentals
• Experience with Linux security mechanisms (seccomp, udev, auditd)
• Understanding of privilege management, capabilities, and application isolation
• Knowledge of secure software development practices and common vulnerabilities
• Ability to work independently and communicate technical concepts clearly

• independence
• strong problem-solving
• clear communication
• C programming (system-level)
• Bash scripting
• Linux fundamentals (Debian-based)