C++ Windows Security Researcher

Rublon; United States; Remote; USD 30,000 - 45,000; Full time

Benefits offered by this job

Online training and sponsored certs

Private medical care

Sports membership

Job summary

Rublon seeks a security-focused researcher to study Windows and Active Directory security for passwordless MFA capabilities. The role blends protocol research with software development, focusing on secure integration of authentication into Windows environments.

You will investigate authentication protocols and Windows security properties, explore MFA integration with Windows, and apply reverse-engineering and debugging tools while sharing findings with peers in a collaborative R&D setting.

Qualifications

• Experience developing Windows software (C++ preferred).
• Familiarity with Windows Server, AD, Group Policy, and Windows API.
• Knowledge of Kerberos/NTLM and Windows security standards.
• Experience with reverse engineering tools such as IDA or Ghidra; scripting with PowerShell or VBA.

Responsibilities

• Investigate authentication protocols including LDAP, Kerberos, NTLM, and SMB.
• Research Windows security properties and Active Directory.
• Explore integrating MFA with Windows systems.

Skills

Windows dev

C++

Active Directory

Windows API

Reverse engineering

PowerShell

VBA

Polish or English

Tools

IDA

Ghidra

Qt

Job description

Role overview

Research Windows and Active Directory security to inform new passwordless multi-factor authentication capabilities. The work combines protocol and platform investigation with software development, with a focus on how authentication can be integrated securely into Windows environments.

Responsibilities

• Investigate authentication protocols including LDAP, Kerberos, NTLM, and SMB.
• Research security properties of Windows, Windows Server, and Active Directory.
• Explore ways to integrate multi-factor authentication with Windows systems.
• Apply reverse-engineering and debugging tools to examine software and security behavior.
• Share findings and collaborate with peers on research and development.

Requirements

• Experience developing Windows software, such as with C++.
• Knowledge of Windows Server, Active Directory, Group Policy, and the Windows API.
• Familiarity with Kerberos and NTLM authentication.
• Understanding of Windows security standards and internal controls.
• Experience with reverse-engineering tools such as IDA or Ghidra, and scripting with VBA or PowerShell.
• Ability to communicate with colleagues and working knowledge of Polish or English.

Nice to have

• Rust or C# experience, Qt development, application security knowledge, relevant education or equivalent experience, and experience collaborating in distributed teams.

Benefits and work setup

The role can be based on-site in Kraków or Zielona Góra under an employment contract, or remotely from within Poland on a B2B basis. Online training and sponsored certifications are offered; employee benefits include private medical care and a sports membership.