Staff Software Engineer

Please Note: 1. If you are a first time user, please create your candidate login account before you apply for a job. (Click Sign In > Create Account) 2. If you already have a Candidate Account, please Sign-In before you apply. Job Description: Senior Linux Systems Engineer – Security & Identity Role Overview We are seeking a   S enior Linux systems engineer  with over 10 years of specialized experience in low-level C/C++ systems programming, cryptographic network security, and enterprise identity integration. In this role, you will architect, build, and secure core Linux infrastructure components. You will be responsible for designing high-throughput Linux daemons, authoring custom PAM modules, automating X.509 certificate lifecycles, and hardening enterprise software against complex, system-level vulnerabilities. Key Responsibilities Low-Level Systems Development : Architect and build high-performance, fault-tolerant Linux daemons using modern C/C++ and POSIX APIs.  Identity & Authentication Engineering:   Design and implement custom Pluggable Authentication Modules (PAM) and integrate systems seamlessly with enterprise identity providers (Active Directory, LDAP, Kerberos, SSSD). Cryptography & PKI Management:   Implement robust end-to-end transport and storage security using OpenSSL/WolfSSL APIs; manage and automate X.509 PKI certificate lifecycles, mTLS configurations, and cryptographic operations. System Hardening & Security:   Enforce system safety across Linux environments using granular security policies (Seccomp, SELinux/AppArmor) and secure coding standards (constant-time cryptographic execution, memory safety). Network Analysis & Debugging:   Diagnose, trace, and resolve complex network- and protocol-level bottlenecks or security flaws across TCP/IP stacks using advanced tools. Required Qualifications & Technical Expertise Experience 10+ years   of hands-on experience in Linux systems programming, enterprise security engineering, or low-level software architecture. Technical Domain Capabilities Languages & Toolchains:   Proficient in C, C++, POSIX APIs, CMake, Make, GCC/Clang, GDB, and advanced Shell Scripting (Bash). Linux Systems Programming:   Deep knowledge of IPC (Unix Sockets, Shared Memory, Message Queues), Concurrency/Threading (pthreads), Asynchronous Event Loops (epoll, io_uring), Custom Daemon development, and manual Memory Management. Cryptography & Security:   Direct API-level experience with OpenSSL/WolfSSL, TLS 1.2/1.3, mTLS, X.509 PKI, PEM/DER encoding, symmetric/asymmetric ciphers, HMAC, and constant-time cryptographic programming. Authentication & Identity Integration:   Demonstrated experience with PAM module development, Active Directory (AD), LDAP, SSSD, Kerberos/GSSAPI, and enterprise OAuth2/OIDC protocols. Networking & Linux Hardening:   Expert understanding of TCP/IP, socket-level programming, Seccomp sandboxing, AppArmor/SELinux mandatory access control, and network…