Radosław Stolarczyk

Experience

• 

  Accenture

  Jun 2012 - Sept 2012

  Oracle Database Administrator

  Working as a programmer/Oracle Database Administrator responsible for migrating databases into Flexcube.

• 

  Citi

  Sept 2012 - Aug 2020

  Level 3 Infrastructure Administrator who supports applications and infrastructure aligned servers (over 3000 virtual/physical) in multi-domain environment for low latency businesses across the Globe in "follow the sun" model (EMEA, NAM, APAC). My main responsibility is to maintain technologies provided by Microsoft, like Windows Operating Systems starting from 2003/R2, through 2008/R2, ending with 2012/R2. These responsibilities also include support of Active Directory with integrated DNS and DFS as well as DHCP servers. By having Centrify system as an addition to Active Directory I am able to centrilize authentication and authorization of users and computers regardless of platforms that is currently in use (Wintel/Unix). Due to wide and complex environment, I am also holding a role of VMware administrator who is not only reponsible for provisioning virtual layer like Servers and VDIs but also physical aspects which includes installation and configuration of ESXi hosts (current version 5.5) for clusters managed by vCenter system. Due to global character of my organisation and large number of users, I am also escalation administrator for Citrix XenApp 6.0, McAfee ePO Orchestrator, Netbackup and Exchange servers. Core responsibilities:- Troubleshooting, fixing and providing root cause analysis.- Change process coordinator based on good practices from ITIL Methodology- Managing global VMware infrastructure by installing/configuring/updating ESXi hosts and clusters- Managing Virtual Machines and templates, currently environment contain approximately 1500+ virtual machines- Managing Active Directory (GPO, User entitlements, Domain Controllers, DNS, DFS, DHCP)- Defining, assigning and removal of McAfee ePO policies to Wintel Servers.- Developing automation scripts using Powershell- Granting terminal access to end users using Citrix XenApp 6.0 portal- Performing planned servers maintenance Show less Wintel Level 3 Support Administrator responsible for managing and maintaining environment composed of more than 2000 (physical/virtual) servers for Global Markets applications working in global "follow the sun" model (EMEA, NAM, APAC). Supporting servers with operating systems starting from Windows Server 2003/R2, Window Server 2008/R2 and Windows Server 2012/R2. Providing new ideas and expertise in troubleshooting various problems related to technology infrastructure.Core responsibilities:- Performing planned server maintenance which includes, installing updates/hotfixes, identifying hardware failures and delegating them to proper teams working in Data Center.- Troubleshooting, fixing and providing deep root cause analysis for issues related to Hardware/OS/Application.- Building, configuring and managing Windows based clusters- Developing scripts using Powershell- Managing virtual servers hosted on VMware usig vSphere Client (vCenter version 5.5)- Creating documentation regarding issues that were solved/solutions that were implemented or other facts that were valuable to other team members using internal knowledge base.- Tier-3-level support (on call 24x7)- Improving processes for Incident/Problem/Change management using ITIL methodology.- Working closely with Compliance and Risk Control teams to meet their requirements regarding security and standards policies. Show less

  • Wintel System/VMware Administrator

    Aug 2015 - Aug 2020

  • Wintel System Administrator

    Jan 2014 - Jul 2015

  • Technology Analyst

    Sept 2012 - Dec 2013
• 

  BEC Financial Technologies

  Aug 2020 - Aug 2022

  Product Owner for two infrastructure components. First is Modern Workplace solution from Microsoft which introduce a new way of managing endpoints within a company based on Azure Cloud. Second component is Active Directory which is composed of multi-domain forests.Core Responsibilities (Modern Workplace):- Maintaining environment of 3k+ Windows 10 endpoints using (Endpoint Manager/InTune)- Keeping software/Operating System up to date- Troubleshooting problems with Windows 10- Addressing vulnerabilities using Defender ATP- Developing new configuration policies for Windows 10, including AppLocker- Developing Powershell scripts for automation of tasksCore Responsibilities (Active Directory):- Review/audit of current identity systems based on Active Directory- Prepare backlog document with suggestions and plan of improvements for configuration and security- Cooperate with off shore team during implementation phases- Remediate configuration and security issues- Hardening of Active Directory infrastructure based on pentesting reports and AD Assessment tools- Create and maintain documentation of current and future solutions- Contact with stakeholders of identity management systems Show less Product Owner responsible for Road Map of multi-forests/multi-domains Active Directory for Danish financial institutions and banks. Ensuring that modern solutions are deployed into the environment with positive impact on security, management and configuration of identity management systems.Core responsibilities:- Review/audit of current identity systems based on Active Directory- Prepare backlog document with suggestions and plan of improvements for configuration and security- Cooperate with off shore team during implementation phases- Remediate configuration and security issues- Create and maintain documentation of current and future solutions- Contact with stakeholders of identity management systems Show less

  • Product Owner of Modern Workplace & Active Directory

    May 2021 - Aug 2022

  • Product Owner of Active Directory

    Aug 2020 - May 2021
• 

  Point72

  Aug 2022 - now

  System Engineer

  As a Windows Engineer at one of the largest hedge funds in the US, I play a critical role in supporting and optimizing a complex, multi-technology environment. My responsibilities span across core infrastructure technologies, ensuring high availability, security, and efficiency. With a focus on both traditional and cloud-based solutions, I continuously work on automating processes to enhance system reliability and performance. My role demands not only deep technical expertise but also the ability to troubleshoot a broad range of issues, often extending beyond my immediate area of expertise.Key Responsibilities: • Active Directory Management: Oversee the administration and enhancement of Active Directory, ensuring robust security and optimal configuration. • DNS & DHCP Infrastructure: Manage both Windows AD Integrated DNS and Infoblox, along with DHCP/DFS services, to maintain network integrity and performance. • Public Key Infrastructure (PKI): Administer the MS PKI setup, ensuring the secure and efficient management of digital certificates. • Virtualization Technology: Spearhead VMware infrastructure initiatives, focusing on virtualization best practices to improve scalability and resilience. • System Center Configuration Manager (SCCM): Utilize SCCM for system updates, software distributions, and hardware inventory, enhancing system compliance and performance. • Cloud Computing: Manage and optimize cloud environments with AWS and Azure, ensuring cost-effective, scalable, and secure infrastructure solutions. • Automation and Scripting: Lead automation efforts using Packer, Ansible, and PowerShell to streamline deployments and operational tasks, significantly reducing manual workload and improving system reliability and efficiency. • Advanced Troubleshooting: Apply expert problem-solving skills to diagnose and resolve a wide array of technical issues, ensuring high availability and minimal disruption. Show less