IT Infrastructure Engineer (Microsoft)

TL;DR

IT Infrastructure Engineer (Microsoft): Leading the administration and evolution of enterprise identity and messaging platforms with an accent on Active Directory, Exchange Hybrid, and PKI management. Focus on designing secure authentication architectures, maintaining Microsoft 365/Entra ID services, and ensuring seamless system integration within a complex hybrid environment.

Location: Remote or Hybrid (Ukraine)

Company

hirify.global is a Ukrainian hybrid IT company and a subsidiary of one of the country's largest telecom operators, focused on creating high-performance technological solutions.

What you will do

• Lead the administration and evolution of Microsoft Active Directory in a complex enterprise environment.
• Own Exchange and Exchange Hybrid, 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.
• Collaborate with network, platform, and application teams on identity-related integrations.

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.
• English proficiency: Intermediate (B1) or higher.

Culture & Benefits

• Flexible work environment: choose between office or remote work.
• Remote onboarding process.
• Performance-based bonuses (annual or quarterly).
• Access to internal training resources, company library, and partner programs.
• Comprehensive health and life insurance.
• Wellbeing program including access to a corporate psychologist.
• Reimbursement for Kyivstar mobile communication expenses.