IT Infrastructure Engineer
Kyivstar
UkraineFull timeRemoteApply by Sep 25, 2026
About the role
- We are looking for a senior, hands-on engineer to own and evolve our enterprise identity and messaging platforms in a hybrid Microsoft environment
- About us Kyivstar .Tech is a Ukrainian hybrid IT company and a resident of Diia.City
- We are a subsidiary of Kyivstar , one of Ukraine's largest telecom operators
- Our mission is to change lives in Ukraine and around the world by creating technological solutions and products that unleash the potential of businesses and meet users' needs
- Over 600+ KS.Tech specialists work daily in various areas: mobile and web solutions, as well as design, development, support, and technical maintenance of high-performance systems and services
- We believe in innovations that truly bring quality changes and constantly challenge conventional approaches and solutions
- Each of us is an adherent of entrepreneurial culture, which allows us never to stop, to evolve, and to create something new
- 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
- What we offer 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
- Originally posted on Himalayas
Required skills
IAM
IT Infrastructure
Systems Engineering
Windows Server Administration
Microsoft Infrastructure
Senior IT Infrastructure Engineer
english_language