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Київстар · 1 month ago

IT Infrastructure Engineer

All, MO

Full-time

Hybrid

Senior Level

Kyivstar.Tech is a Ukrainian hybrid IT company and a subsidiary of Kyivstar, one of Ukraine's largest telecom operators. They are seeking a senior, hands-on engineer to own and evolve their enterprise identity and messaging platforms in a hybrid Microsoft environment.

Telecommunications

Comp. & Benefits

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, 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

Qualification

Active DirectoryExchange HybridPublic Key InfrastructureMicrosoft 365ADFS / SSOWindows ServerEnglish ProficiencyTechnical Leadership

Required

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

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.

Company

Київстар

Київстар – найбільший український оператор електронних комунікацій, що станом на березень 2023 року обслуговував 24,3 млн абонентів мобільного зв’язку та понад 1,1 млн абонентів «Домашнього інтернету».

Founded in 1994