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. Rublon is a member of Astec Group.

Astec Group provides IT consulting, custom software development and cloud services. We have helped market leaders to unlock their potential by delivering digital innovation in the automotive, energy and telecom sectors since 1993. Astec teams are hired to advise clients on innovation and to design, build, maintain and support compliant enterprise software solutions.

We are looking for a long-term employee who will support us in the following project:

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, Kerberos, NTLM, Entra ID, FIDO2

• Team: 8 researchers, 1 project manager, 1 product manager

• Language: Polish for communication with team members and for project documentation

• 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 Windows Security Engineer on the Rublon team you will help develop software for modern user authentication:

• 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 Windows software development (C++, ideally also Rust)

• 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 Rust, Go and/or C# programming language(s)

• Experience with Qt development framework

• Industry recognised cyber security related certifications such as CEH, EnCE, CRISC, SANS GSEC, GCIH, GCIA, GIAC, GCFA, GNFA and/or CISSP

• 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

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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

1. You’ll be invited to an online meeting with our recruiter

2. Afterwards, we’ll ask you to do a small assignment, which will then be discussed with one of our technical leads

3. If everything goes well, we will make you an offer and invite you to a final interview