IT Infrastructure Engineer

What you will do

• Lead the administration and evolution of Microsoft Active Directory in a complex enterprise environment.
• Own Exchange and Exchange Hybrid (on-premises and Exchange Online), ensuring reliability, security, and seamless coexistence.
• Design, operate, and maintain Public Key Infrastructure (PKI), including certificate lifecycle management.
• Administer and develop Microsoft 365 / Entra ID identity services, roles, and access models.
• Implement and support ADFS / SSO and federation scenarios for internal and external applications.
• Ensure secure access control, authentication, and authorization across platforms.
• Collaborate with network, platform, and application teams on identity-related integrations.
• Drive continuous improvement of identity and messaging architectures and operational practices.

Qualifications and experience needed

• Strong hands-on expertise in Active Directory (architecture, trusts, GPO, troubleshooting).
• Proven experience with Exchange (on-prem) and Exchange Hybrid.
• Solid practical experience with PKI (Root/Issuing CAs, templates, CRL/OCSP).
• Production experience with Microsoft 365 / Entra ID in hybrid environments.
• Practical knowledge of ADFS / SSO, federation, and claims-based authentication.
• Strong Windows Server background in enterprise environments.
• Ability to work independently, take ownership, and act as a technical lead.
• English proficiency: Intermediate or higher.

es for everyone (annual or quarterly — depends on the role)

• We train employees: the opportunity to learn through the company’s own library, internal resources and programs from partners.
• Health and life insurance.
• Wellbeing program and corporate psychologist.
• Reimbursement of expenses for Kyivstar mobile communication.