Yann Lezy

Personal projects around ESP32, LD2 410 sensors, network systems, shop window / store animation.

Infrastructure architect and outsourced CIO with over 25 years of experience in designing and operating critical IT environments for SMEs and multi-site groups.

Notably, I support a major national mobility player in a multi-datacenter architecture combining 90+ Citrix VDI workstations, high-availability Hyper-V clusters, multi-VLAN FortiGate segmentation, clustered HA SQL Server and PostgreSQL, NetScaler ADC, and Cloudflare WAF. I manage daily infrastructure operations, operational cybersecurity, migrations, and business continuity.

I undertake high-impact missions: datacenter migration, virtualization, network redesign, DR/BCP, secure private cloud, PowerShell automation, and multi-site infrastructure optimization.

Recent experiences:

• Impact study for datacenter migration of an E.Leclerc group (stakes, risks, budget, providers, scheduling)

• Complete infrastructure migration for a training organization (network, security, 80 workstations, web/DMS/file servers)

• PHP middleware development connecting Salesforce, Alfresco/Nextcloud DMS, web applications, reporting, and Sage

• Design of a multi-site ERP for quotes-contracts-invoicing-accounting for a Parisian rental company

I favor critical environments requiring reliability, security, and business continuity. My approach: robust, automated, and documented architectures capable of operating without critical human dependence.

Available for audits, architecture, migration, or outsourced CIO support.

• • Management of a team of 10 developers.

• • Design of multi-site ERP and business applications.

• • SQL Server architecture and client deployments.