Sebastian Hałaczkiewicz
Sebastian Halaczkiewicz
Hałaczkiewicz
Halaczkiewicz
Platform Operations & Infrastructure EngineerSebastian Hałaczkiewicz
Platform Operations & Infrastructure Engineer specializing in Azure, Datadog, Windows Server, Active Directory, VMware and enterprise-grade reliability. Experienced in cloud operations, monitoring, incident management and OT/industrial environments.
Cloud, Infrastructure & Microsoft Ecosystem
Windows Server
Deep expertise in OS maintenance, security patching, role-based configuration and enterprise infrastructure support.
Active Directory
IAM, Group Policy management, Domain Controller health monitoring and secure access control in enterprise environments.
Azure Cloud & Hybrid
Management of Azure resources, virtual networks, cloud identities and hybrid infrastructure for enterprise environments.
Platform & Operations
Platform operations monitoring, PowerShell automation, incident and change management aligned with SRE practices.
Skills Matrix
| Skill | Level | Experience |
|---|---|---|
| Azure | Advanced | 3+ years |
| Datadog / Observability Datadog | Advanced | 2+ years |
| Windows Server | Expert | 10+ years |
| Active Directory | Expert | 10+ years |
| VMware vSphere | Intermediate | 4+ years |
| Networking | Advanced | 10+ years |
| MS SQL Server | Advanced | 4+ years |
| OT / Industrial IT | Intermediate | 4+ years |
Professional Path
A journey through cloud operations, platform reliability and enterprise infrastructure.
Customer Service Support Engineer
Etteplan (for Fortum) • 2026 — Today
Focus on high availability infrastructure, Active Directory and Azure cloud path. Integrated environment management with Datadog monitoring to ensure maximum service uptime and performance.
L2 Customer Support Agent
GR8 Tech • 2024 — 2026
Built the L2 support team from scratch, establishing foundational operational policies and comprehensive technical documentation. Responsible for high-level ticket analysis and creating Jira dashboards and filters to optimize team workflow.
2nd Line Support Analyst/Engineer
Atos Poland (for Ministry of Justice UK) • 2022 — 2023
Specialized in Active Directory administration, complex NTFS permission management and Microsoft Intune device enrollment. Managed user accounts, mailboxes via Exchange and maintained Office 365 cloud environments.
Banking Systems Administrator
Credit Agricole Bank Polska S.A. • 2021 — 2022
Management of MS SQL Servers and administration of Pivotal CRM application. Supported debt collection processes, deployed new software versions and provided advanced troubleshooting for Pivotal application issues.
IT Specialist / System Administrator
Nestle Polska / Nestle Purina • 2016 — 2021
End-to-end infrastructure management: Windows Servers (2008R2/2016), VMware (ESXi, 3PAR storage), MS SQL databases and Cisco network environments. Also managed CCTV systems (Analog/IP) for enterprise security.
Systems Administrator
Sky IT (for Dongseo Display & Pantos Logistics) • 2015 — 2016
Infrastructure and network administration, including administration of computer networks, workstations and peripherals. Managed network resources and supervised CCTV systems for logistics operations.
Hardware & Systems Diagnostics Specialist
PHU TELDOM • 2013 — 2015
Expert diagnosis and repair of PC/laptop hardware and software systems. Conducted high-precision testing and maintenance of electronic components to ensure optimal performance and longevity.
Connect with me
Available for professional discussions on Microsoft Infrastructure, Platform Operations and enterprise architecture.