Ciklum is looking for an Expert Cyber Security Engineer to join our team full-time in Romania. We are a custom product engineering company that supports both multinational organizations and scaling startups to solve their most complex business challenges. With a global team of over 4,000 highly skilled developers, consultants, analysts and product owners, we engineer technology that redefines industries and shapes the way people live. About the role: As an Expert Cyber Security Engineer, become a part of a cross-functional development team engineering experiences of tomorrow. This role blends proactive design with hands-on security validation in web application development. You will focus on long-term security improvements by identifying and mitigating risks before they materialize. Responsibilities: Architect & Threat Model: Lead security design reviews and conduct in-depth threat modeling for new products and critical infrastructure Research & Build: Investigate emerging threats and novel attack vectors, then use your findings to design and build defense strategies to mitigate them Assess & Penetrate: Perform hands-on penetration testing and security assessments against our most complex systems to discover and validate vulnerabilities Requirements: 7+ years of hands-on long-term projects with a strong background in both offensive and defensive security Significant, proven experience in penetration testing (web applications preferred) and a deep understanding of an attacker's mindset Strong programming and scripting skills (Python preferred) with experience building security tools, automation, or prototypes Deep technical knowledge in at least one core security domain, such as cryptography, authorization / authentication, secure architecture, network security Very good communication skills (English) Desirable: Experience securing modern technologies like serverless architectures or AI/ML platforms Experience with secure architectures for cloud-native environments (AWS, GCP, Kubernetes) Relevant industry certifications (e.g., OSCP, OSCE, CISSP) What`s in it for you? Strong community: Work alongside top professionals in a friendly, open-door environment Growth focus: Take on large-scale projects with a global impact and expand your expertise Tailored learning: Boost your skills with internal events (meetups, conferences, workshops), Udemy access, language courses, and company-paid certifications Endless opportunities: Explore diverse domains through internal mobility, finding the best fit to gain hands-on experience with cutting-edge technologies Enjoy radical flexibility – work remotely or from an office, your choice Care: Medical subscription to Regina Maria, meal tickets of 16 ron net/day worked About us: At Ciklum, we are always exploring innovations, empowering each other to achieve more, and engineering solutions that matter. With us, you’ll work with cutting-edge technologies, contribute to impactful projects, and be part of a One Team culture that values collaboration and progress. In Romania, we welcome top-tier tech talent — whether from our Bucharest office or fully remotely. Tap into deep industry knowledge, grow your career, and make an impact in an empowering environment. Want to learn more about us? Follow us on Instagram, Facebook, LinkedIn. Explore, empower, engineer with Ciklum! Interested already? We would love to get to know you! Submit your application. We can’t wait to see you at Ciklum. #LI-SM1