Estonia has long been recognized as a global leader in digital innovation, from pioneering e-residency to building world-class cybersecurity frameworks. At the heart of this digital ecosystem are the Chief Information Security Officers (CISOs) and security leaders who safeguard the nation’s critical infrastructure, financial systems, and emerging tech ventures.
In Tallinn, these professionals are not just defending against cyber threats; they are shaping the future of secure digital transformation. This list highlights ten CISOs to watch in 2025, showcasing the talent, expertise, and strategic vision driving Estonia’s cybersecurity landscape forward.
Mariliis Uusjärv — Swedbank Estonia
Mariliis Uusjärv currently serves as CISO at Swedbank Estonia, a role she has held since October 2021. Before that, she spent several years in public‑sector security roles (including with the Ministry of the Interior’s IT & Development Centre and the Estonian Rescue Board), reflecting deep experience across government and critical national infrastructure. In addition, she holds certifications such as Certified Information Security Manager (CISM) and ISO‑27001 Lead Implementer. Her long tenure in security and compliance, combined with the demands on a major bank in today’s threat environment, makes her a figure to watch in Estonian banking cybersecurity.
Sigrid Ojavee — Tallinn University of Technology (TalTech)
At TalTech, Sigrid Ojavee is responsible for creating and maintaining an ISO 27001-compliant information security management system (ISMS), enhancing the university’s cyber posture, and fostering security knowledge across all staff. Her expertise lies in aligning strategic business objectives with cybersecurity, building resilient systems, and cultivating a security-aware culture. Ojavee’s work ensures that one of Estonia’s leading technical universities remains protected from the evolving threat landscape.
Alex Doronin — Admirals
Alex Doronin is a seasoned cybersecurity professional with over 18 years of IT experience. He currently serves as CISO at Admirals while leading Cybertex Security, a firm he founded in 2020 to provide comprehensive security services including assessments, architecture, managed security, and training. Doronin’s dual role underscores his commitment to both operational security in financial services and empowering businesses of all sizes to protect their digital assets.
Andero Piberman — Piletilevi PLG
Andero Piberman has held multiple senior security roles across Estonian government agencies, including the State Infocommunication Foundation and the Estonian Transport Administration. As of June 2025, he serves as CISO at Piletilevi PLG, where he is responsible for safeguarding critical ticketing infrastructure. Piberman’s extensive government experience equips him with a unique perspective on aligning organizational security with national cybersecurity standards.
Dmitri Ivanov — AS Eesti Raudtee / Estonian Railways Ltd
Dmitri Ivanov oversees cybersecurity at Estonian Railways, safeguarding one of the country’s most critical transportation networks. Before joining AS Eesti Raudtee in 2023, he led the IT and Cyber Security Unit in the Office of the President of Estonia, where he managed information security across national-level systems. Ivanov combines operational expertise with strategic oversight, ensuring resilience in both public and private infrastructure domains.
Joseph Carson — Segura
Joseph Carson brings more than 30 years of global cybersecurity experience to his role as Advisory CISO at Segura. A recognized author and educator, he hosts the “Security by Default” podcast and has contributed to The Wall Street Journal, USA Today, Dark Reading, and CSO Magazine. Carson is also author of “Cyber Security for Dummies,” which has guided over 20,000 readers worldwide. His thought leadership bridges global best practices with local security communities in Estonia.
Patrik Maldre — CR14
Patrik Maldre leads CR14, a next-generation cyber range multiverse, while serving as Lead Instructor for Cyber Intelligence at Evolve Security Academy. His career spans ethical hacking, cyber intelligence, and diplomatic service in Estonia, with teaching experience in the U.S. Maldre specializes in preparing organizations and professionals for advanced cyber defense scenarios, combining operational insight with education to strengthen the security workforce.
Priit Rebane — Riigi Kinnisvara
Priit Rebane heads information security at Riigi Kinnisvara, Estonia’s state-owned real estate management company. He also founded Foxworx OÜ, demonstrating entrepreneurial expertise in cybersecurity. Rebane’s approach emphasizes securing organizational assets while integrating information security with broader business and operational objectives.
Thea Sogenbits — Estonian Tax and Customs Board (Maksu- ja Tolliamet)
Thea Sogenbits leads cybersecurity strategy at the Estonian Tax and Customs Board, overseeing AI governance, privacy, and cyber risk alignment with business objectives. She specializes in ISO/IEC 27001 and 42001 implementation, security by design, and resilience planning. Sogenbits’ leadership ensures that critical national services are fortified against evolving cyber threats.
Tallinn’s Cybersecurity Vanguard
Tallinn’s cybersecurity scene reflects a sophisticated blend of public and private expertise, from banking and railways to education and national infrastructure. The city’s ecosystem continues to nurture emerging talent, ensuring that Estonia remains a global hub for digital resilience and security innovation.