Bartlomiej Kosiak — Microsoft Security Consultant, Trainer & Community Builder

I work with organisations across Poland and Europe to secure their Microsoft infrastructure — Active Directory, Entra ID, Azure, and Microsoft 365. Whether it's a security assessment, an implementation project, or upskilling your team, I focus on practical, production-ready results.

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Cybersecurity Consultant | Microsoft Technologies
Trainer, speaker, and practitioner focused on identity security,
cloud infrastructure, and compliance — turning best practices
into production-ready configurations.
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Active Directory · Entra ID · Azure · M365 · Security & Compliance

Expertise & Services

Active Directory

Administration, Architecture, Security, Tiering, Hardening, Disaster Recovery of on-premises AD.

AD DSAD CSGPOTieringSmartCardsHardeningAssessment

Entra ID & Microsoft 365

Conditional Access, Privileged Identity Management, Identity Protection, MFA, Entitlement Management, tenant hardening, B2B Collaboration and Compliance.

CAPIMMFAFIDO2B2BComplianceAssessmentHardening

Azure Cloud

Subscription Governance, Networking, Role Based Access Control, Cost Optimisation, and IaaS architecture.

GovernanceRBACNetworkingFinOpsDefenderAssessment

Training & Speaking

Knowledge sharing at IT events and meetups. Hands-on workshops and training for IT teams on Microsoft security topics.

WorkshopsMeetupsEventsTraining

Lublin.MS

I am Co-Founder of Lublin Microsoft Group — a Microsoft technologies meetup in Lublin, held every odd month on the second Wednesday. We cover a wide range of Microsoft topics: on-premises infrastructure, Azure, Microsoft 365, security, data, AI, and more. Whether you're just starting out or you're a seasoned pro, come join us — we'd love to see you there!

Next meetups
Every odd month · 2nd Wednesday
Jan · Mar · May · Jul · Sep · Nov

Get in Touch

Whether you need a security assessment, help with identity architecture, or want to strengthen your team’s capabilities — I’d be glad to discuss how I can help.

Let’s discuss your project

I typically respond within 24 hours. For urgent security incidents, please mark your message accordingly.