We are seeking a highly skilled Senior Security Engineer to support our client in designing, implementing, and maintaining advanced security solutions across retail environments. This role offers the opportunity to lead critical initiatives spanning POS, local networks, and cloud, ensuring compliance, resilience, and proactive defence.Your tasks Design and document a scalable security architecture for retailer environments Develop and maintain security configuration baselines and hardening guides Implement scanning and patching processes for retailer systems Create and test incident response procedures tailored to retailer threats Deliver targeted training and awareness materials for retailer staff Deploy monitoring tools and generate regular security posture reports Requirements Ability to work in a hybrid model: 2 days per week at the client’s office in Wrocław At least 5 years of proven experience in security engineering, preferably in retail or distributed environments Strong knowledge of network security, endpoint protection, and incident response Familiarity with compliance standards, e.g., ISO 27001, PCI-DSS Excellent communication and documentation skills Advanced English proficiency (spoken and written) Residing in Poland required What we offer  Great Place to Work since 2015 - it’s thanks to feedback from our workers that we get this special title and constantly implement new ideas  Employment stability - revenue of PLN 2.1BN, no debts, since 2006 on the market  We share the profit with Workers - over PLN 76M has already been allocated for this aim since 2022  Attractive benefits package - private healthcare, benefits cafeteria platform, car discounts and more  Comfortable workplace – class A offices or remote work  Dozens of fascinating projects for prestigious brands from all over the world  PLN 1 000 000 per year for your ideas - with this amount, we support the passions and voluntary actions of our workers  Investment in your growth – meetups, webinars, training platform and technology blog – you choose  Fantastic atmosphere created by all Sii Power People  Join the Sii team – develop your skills, gain experience, and build your career!