IT Infrastructure Engineer

🕒 June 16

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Київстар

WebsiteLinkedInAll Job Openings

1001 - 5000 employees

Founded 1994

📡 Telecommunications

Telecommunications

Київстар is a Ukrainian telecommunications company that offers a wide range of services for private individuals, businesses, and the public sector. These services include mobile communication, home internet, television services, and international roaming. Київстар provides various packages and tariffs to suit different needs, such as SIM cards, eSIM, internet packages, and bundles combining internet, TV, and mobile services. The company also supports social initiatives, facilitates online doctor appointments, and provides technical support and customer service through multiple channels. Київстар is committed to offering quality telecommunication solutions and fostering digital connectivity in Ukraine.

📋 Description

• 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.

🎯 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, take ownership, and act as a technical lead. • English proficiency: Intermediate or higher.

🏖️ Benefits

• Office or remote — it's up to you. • Remote onboarding. • Performance bonuses 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.