Senior QA Engineer

Come work at a place where innovation and teamwork come together to support the most exciting missions in the world! Company Profile Qualys is a leading provider of cloud-based security and compliance solutions, helping organizations identify vulnerabilities, manage cyber risk, and protect their IT infrastructure. The Module Loader is a critical component of Qualys Remote Vulnerability Detection and acts as the brain behind vulnerability assessment workflows . It plays a key role in orchestrating and executing the capabilities required to identify vulnerabilities across diverse enterprise environments and technologies. Given its central role in vulnerability detection, the Module Loader requires a high degree of accuracy, reliability, scalability, performance, and backward compatibility . The team works on complex engineering challenges involving vulnerability detection, networking, protocols, operating systems, security technologies, and large-scale enterprise environments. Be part of the team building and validating one of the foundational components powering Qualys vulnerability detection. Core Responsibility As a Senior Software QA Engineer , you will be responsible for ensuring the quality, reliability, performance, and scalability of the Module Loader and its remote vulnerability detection capabilities. This is a hands-on technical QA/SDET role where you will own quality from requirements and design through release and production. You will work closely with developers, security researchers, Product Management, and other engineering teams to understand vulnerability detection requirements and translate them into comprehensive test strategies. You will be expected to go beyond functional validation and understand how vulnerability detection works , identify potential gaps and edge cases, create complex test environments, automate validation, analyze failures, and troubleshoot problems across application, operating system, network, and protocol layers. You will have end-to-end quality ownership of features, including test design, automation, functional and integration testing, performance and scalability testing, regression qualification, debugging, and production issue analysis . Position Requirements Eligible candidates should meet the following criteria. Required 4+ years of hands-on experience in Software QA, SDET, or Software Testing for complex enterprise software products. Strong experience in testing system-level, security, networking, or distributed applications , preferably on Linux/Unix platforms. Strong hands-on experience with test automation using Python, Shell scripting, C/C++, or equivalent programming/scripting languages. Ability to independently understand complex feature requirements and technical designs and develop comprehensive test strategies, test plans, test scenarios, and automation . Strong understanding of Linux/Unix operating systems , processes, services, file systems, permissions, package management, and system-level troubleshooting. Strong knowledge of networking fundamentals and protocols , including TCP/IP, DNS, HTTP/HTTPS, SSL/TLS, proxies, and client-server communication. Strong debugging and problem-solving skills with the ability to investigate failures across application, operating system, and network layers . Experience analyzing logs, network traffic, system behavior, application failures, CPU/memory utilization, and other diagnostic information to drive issues toward root cause. Experience in functional, integration, regression, negative, compatibility, upgrade, and end-to-end testing . Ability to identify corner cases, failure scenarios, environmental dependencies, and regression risks beyond documented requirements. Experience validating software across heterogeneous enterprise environments involving different operating systems, services, network configurations, and software versions . Experience with performance, scalability, reliability, and resiliency testing of enterprise products. Strong focus on an automation-first approach , with experience building maintainable and reusable automated tests and reducing repetitive manual validation. Experience integrating automation into CI/CD pipelines and analyzing failures to differentiate product defects, automation failures, and environmental issues. Strong understanding of SDLC/STLC, defect lifecycle, risk-based testing, release qualification, source control, and software engineering best practices . Ability to work independently with developers and other engineering teams to reproduce, debug, and drive complex product issues to closure. Strong analytical mindset with the ability to question assumptions and identify scenarios where expected vulnerability detection behavior may produce incorrect, incomplete, inconsistent, or unexpected results . Self-driven and quick learner with an interest in understanding new technologies, operating systems, protocols, applications, and security concepts. Excellent communication and collaboration skills with the ability to engage with different technical teams, seek clarification, challenge assumptions constructively, and build consensus. Desirable Requirements Experience in the Cyber Security, Vulnerability Management, Vulnerability Assessment, or Network Security domain. Understanding of vulnerability detection concepts and security assessment methodologies. Experience testing network scanners, vulnerability scanners, security products, or other network-intensive system software . Good knowledge of common enterprise protocols and services. Knowledge of SSL/TLS, certificates, authentication mechanisms, and cryptography fundamentals . Experience with packet analysis and network troubleshooting tools such as Wireshark/tcpdump or equivalent tools. Exposure to C/C++ applications and debugging tools such as GDB . Experience creating and maintaining complex test environments consisting of multiple operating systems, applications, services, and network configurations. Exposure to containers, virtualization, and cloud infrastructure . Experience developing or enhancing QA automation frameworks, test infrastructure, or large-scale test environments . Basic Qualifications Bachelor's / Master's degree in Computer Science, Computer Engineering, Information Technology, or a related technical discipline (M.E / M.Tech, B.E / B.Tech, MCA) and 4 to 6 years of relevant experience as a Senior Software QA Engineer, Software QA Engineer, SDET, Automation Engineer, Software Test Engineer, or a similar technical quality engineering role.