Senior QA Engineer

About you You are a senior-level QA professional who excels in complex, fast-paced environments. You are a natural problem-solver who enjoys tracing root causes and investigating intricate system behaviors. You thrive on technical responsibility and acting as a bridge between diverse engineering teams. You are self-motivated, highly organized, and comfortable balancing high-level strategy with a hands-on approach to quality. About the project We are building a leading cybersecurity platform designed to protect and monitor digital environments across the entire development lifecycle. The system covers everything from low-level system engineering and backend to frontend UX/UI, operating in a technically diverse environment with rapid growth and high-frequency releases. We focus on a blend of 80% manual and 20% automated testing to ensure functional excellence, performance, and security across all components. With a fast-paced deployment cycle, maintaining high-speed integration and system reliability is critical to our mission. Your areas of responsibility Full-Stack QA: Deliver high-quality testing for backend, frontend, and low-level system components at a fast deployment pace. Problem Solving: Apply an "out-of-the-box" approach to trace and troubleshoot complex bugs in system code and user interfaces. Strategic Testing: Define test strategies and handle end-to-end testing of new features. Collaboration: Work closely with Research and Development engineers to ensure seamless feature integration in an Agile environment. Skills and requirements 6–8 years of professional experience as a QA Engineer with a deep understanding of the SDLC and Agile methodologies. Full-stack testing expertise, including advanced proficiency in backend, frontend, and client-server API testing. In-depth Operating System knowledge, with extensive experience in both Windows and Linux environments. Comprehensive Networking & Security acumen, including the OSI model, data protocols (HTTP, DNS, IP, FW), and encryption principles. Infrastructure & Virtualization experience, specifically with technologies such as ESXi and Docker. Expert command of industry tools, including Jira for bug tracking and Wireshark or tcpdump for network and application monitoring. Automation & Scripting capabilities, including test automation execution and proficiency in Python, Bash, or JavaScript. English proficiency (at least B2), ensuring effective communication within a technical team. We offer A real opportunity to influence the product, architecture, and technical decisions; Direct communication with C-level management, without unnecessary bureaucracy; Remote-first environment; Long-term and enjoyable cooperation; Paid annual vacation and paid sick leave; Official public holidays as days off; Personal legal support; English classes; Team-building events and a friendly, supportive atmosphere.