We are looking for a full-time Cybersecurity Engineer to join K3Y Ltd, a fast-growing SME with presence in Bulgaria and Greece. K3Y Ltd is one of the most dynamic technology companies in Bulgaria, Greece and Europe, dealing with deep tech topics like cybersecurity, data privacy, artificial intelligence, the 6th generation of cellular networks and next generation Internet of Things. Participating in more than 32 EU-funded projects (H2020, Horizon Europe, Erasmus+ and more), K3Y Ltd is emerging as a leading technology and service provider across Europe and worldwide.
You will conduct risk and security assessments on network infrastructures, applications, and emerging technologies (5G, IoT, SDN/NFV), contributing directly to EU-funded R&D and commercial projects. Your findings will shape the development of next-generation cybersecurity tools, including agentic penetration testing suites, intrusion detection systems, threat mitigation tools, and security datasets used across multinational research consortia.
Responsibilities
- Plan and execute penetration tests on network infrastructures, virtualised environments, and emerging tech platforms.
- Develop and maintain custom security tools, scripts, and attack/defence emulators.
- Contribute to the creation and curation of security datasets for ML-based threat detection research.
- Perform vulnerability assessments and risk analysis, translating findings into actionable recommendations.
- Author and deliver technical and non-technical reports, research deliverables, and scientific papers.
- Collaborate with internal engineers and international consortium partners on cybersecurity R&D workstreams.
- Participate in technical and consortium review meetings, representing the company.
- Stay current with the latest attack techniques, CVEs, and cybersecurity research trends.
Basic qualifications
- BSc and/or MSc in Computer Science, Engineering, ICT or a related field.
- Proven hands-on experience in penetration testing (network, web application and/or infrastructure).
- Proficiency in Python for exploit scripting, automation and tooling.
- Familiarity with vulnerability assessment methodologies (CVE analysis, CVSS scoring, threat modelling).
- Strong problem-solving, documentation and communication skills across technical and non-technical contexts.
- Self-motivated, able to work independently and collaborate across international teams.
Preferred qualifications
- PhD in a scientific or engineering field, preferably computer science, electrical engineering or ICT.
- Experience working with EU-funded projects.
- Certifications such as OSCP, CEH, GPEN, CISSP or CCNA Security.
- Experience with containerised environments (Docker, Kubernetes) and their security implications.
- Knowledge of red team / blue team methodologies and adversarial simulation frameworks such as MITRE ATT&CK.
- Exposure to Horizon 2020 / Horizon Europe R&D projects.
Benefits
- Friendly, motivated and inclusive team with a strong European and international network.
- Competitive remuneration package based on qualifications and experience.
- Exposure to multinational and multicultural environments.
- Diversity of challenges, experience and working teams.
- Work alongside experienced and talented professionals.
- Flexible working hours.
- Career progression opportunities.
Selection process
- Shortlisted applicants will be invited for a remote or on-site interview.
- Only shortlisted applications will be contacted.
- For more information contact info@k3ylabs.com.
Equal opportunities
K3Y Ltd is proud to be an equal opportunity workplace. We are committed to equal employment opportunity without unlawful regard to race, colour, ancestry, religion, gender, national origin, sexual orientation, age, citizenship, marital status, disability, veteran status, or other locally protected characteristics.
Starting date
No fixed starting date. We are looking to fill the position as soon as possible.
To apply, send a detailed CV to info@k3ylabs.com with the subject “Application for the position of the Cybersecurity Engineer”.