C++ Windows Security Researcher

Join Rublon to work with a team of cybersecurity enthusiasts who are building the future of enterprise user authentication. Rublon MFA is a multi-factor authentication platform used by hundreds of customers across the globe to protect employee logins to networks, servers and applications. We are looking for a long-term employee who will support us in the following area: R&D on Windows and Active Directory Security Rublon’s research & development activities on Windows and Active Directory security will enable us to develop new solutions for passwordless multi-factor authentication in these environments. This is a greenfield project. How You’ll Work • Location: 100% remote or office in Krakow, Zielona Gora • Technology Stack: C++, Windows Server, Active Directory, LDAP, Kerberos, NTLM, Entra ID, FIDO2 • Self development: access to online training courses, sponsored certifications • Benefits for employees: access to private medical care and MultiSport card What You’ll Do As a C++ Windows Security Engineer on the Rublon team you will help develop software for modern user authentication: • Perform security research on authentication protocols (LDAP, Kerberos, NTLM, SMB) • Research on Windows and Windows Server security • Research on MFA integration possibilities with Windows and Windows Server • Research on Active Directory security • Research on Kerberos and NTLM authentication protocol security • Research on MFA integration possibilities with Active Directory • Research on usage of Trusted Platform Module (TPM) on Windows for secure user authentication • Research on usage of Bluetooth on Windows for secure user authentication • Develop enterprise software solutions for Windows user authentication • Development takes place locally on your company laptop as well as on external testing environments • Analyze requirements, create concepts and discuss them with the project and product manager • Monitor code quality and perform code reviews • Design, implement and execute development and integration tests Skills You Have • Experience with reverse engineering and tools like IDA Free/Pro, Ghidra • Experience with Windows software development (e.g. C++) • Knowledge of Windows Server, Active Directory and GPO • Knowledge of Windows API • Knowledge of Kerberos and NTLM authentication protocols • Knowledge of Windows technical security standards and internal controls • Familiarity with VBA and PowerShell scripting • Ability to confidently communicate with peers • Knowledge of Polish or English language Nice To Haves • Experience with Rest and/or C# programming language(s) • Experience with Qt development framework • Formal education and advanced degree in Information Security, Cybersecurity, Computer Science or similar and/or commensurate demonstrated work experience in the same • Knowledge of software application security • Demonstrated success as part of a distributed team Why Apply • You love collaborating with, teaching, and learning from high-performing peers on software projects • You work best in teams of high-performers rallying around achieving a common goal Steps After You Apply • You’ll be invited to an online meeting with our recruiter • Afterwards, we’ll ask you to do a small assignment, which will then be discussed with one of our technical leads • If everything goes well, we will make you an offer and invite you to a final interview