IT Infrastructure Engineer

Responsibilities

• ▹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 and security
• ▹Design, operate, and maintain 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

Requirements

• ▹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 and act as a technical lead

Soft skills

What we offer

• ▹Office or remote - your choice
• ▹Remote onboarding
• ▹Performance bonuses for everyone (annual or quarterly)
• ▹Internal training via company library, resources, and partner programs
• ▹Health and life insurance
• ▹Wellbeing program and corporate psychologist
• ▹Reimbursement for Kyivstar mobile communication

About the company

Kyivstar.Tech is a Ukrainian hybrid IT company and resident of Diia.City, a subsidiary of Kyivstar, one of Ukraine's largest telecom operators, with 600+ specialists across mobile, web, and enterprise systems.