Lead Sustenance Engineer

Come work at a place where innovation and teamwork come together to support the most exciting missions in the world! About the Role We are looking for a seasoned Software Engineer – Sustenance Engineering to support and enhance our network vulnerability scanning platform. This role is ideal for someone who thrives on maintaining complex systems, resolving challenging issues, and ensuring the long-term stability, performance, and security of a mature product. You will work closely with cross-functional teams to troubleshoot, optimize, and evolve a security product that operates across low-level network and application-layer protocols. Key Responsibilities Collaborate with support for customer communication and first hand CRM reviews. Maintain and enhance core components of a network vulnerability scanning engine written in C/C++. Investigate, debug, and resolve complex issues in production and development environments, including networking, containerization, and system-level interactions. Optimize existing code for performance, reliability, and scalability. Ensure compatibility and stability across evolving environments (OS, libraries, containers). Collaborate with product management, QA, DevOps, and security researchers to triage issues and deliver timely fixes and updates. Participate in code reviews and contribute to improving software quality, maintainability, and security posture. Support CI/CD pipelines and automation for regression testing and deployment. Maintain and improve Dockerized environments for consistent deployment and testing. Required Qualifications Bachelor’s or Master’s degree in Computer Science, Software Engineering, or a related field. Strong proficiency in C/C++ with a focus on systems-level programming and debugging. Solid understanding of networking fundamentals (TCP/IP, sockets, HTTP, SMB, SSH, etc.). Experience with Linux systems programming, performance tuning, and debugging tools (e.g., gdb, strace, perf). Hands-on experience with Docker and containerized environments. Strong analytical and problem-solving skills with a focus on root cause analysis and long-term fixes. Preferred Qualifications Prior experience in sustaining or support engineering roles for security or networking products. Familiarity with Kubernetes and container orchestration tools. Exposure to CI/CD pipelines and DevOps practices. Understanding of secure coding practices and cryptographic libraries. Experience with cloud platforms such as AWS, OCI, or Azure. Passion for automation and scripting to reduce manual effort and improve reliability. Join our talent community and receive the latest Qualys news, content, and be first in line for new job opportunities. Join our Talent Community! Qualys, Inc. (NASDAQ: QLYS) is a pioneer and leading provider of disruptive cloud-based security, compliance and IT solutions with more than 10,000 subscription customers worldwide, including a majority of the Forbes Global 100 and Fortune 100. Qualys helps organizations streamline and automate their security and compliance solutions onto a single platform for greater agility, better business outcomes, and substantial cost savings.