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Francisco Renault de castro Junior

@franciscorenaultdeca

Identity security specialist at Telefónica Tech, hardening Active Directory Tier 0 and hybrid identity.

Brazil
Message

At Telefónica Tech / Vivo Telefônica Brasil, I support MAPFRE’s global enterprise environment across Tier 0 identity infrastructure and multi-domain Active Directory forests integrated with Microsoft Entra ID.

I participate in Active Directory security hardening and Microsoft security fortification aligned with Microsoft best practices and Zero Trust. I also contributed to 15 MAPFRE security projects across 15 Latin American countries, including tiered access controls, ACL Xray and Microsoft assessment remediation.

At C6 Bank, I contributed to projects resolving complex Azure support incidents and improving reliability through operational automation and monitoring. I also troubleshot Azure IaaS virtual machine issues and supported Active Directory, MFA and virtualized environments.

Earlier, I supported enterprise infrastructure and identity work at Synelience Portugal, FDS, a DXC Technology Company, Rumos IT Services and other organizations. My background includes Active Directory, authentication troubleshooting, infrastructure migrations, Microsoft security assessment remediation and backup and recovery.

Experience

Work history, roles, and key accomplishments

TB
Current

Information Technology Security Specialist

Telefónica Tech / Vivo Telefônica Brasil

Aug 2022 - Present (4 years 3 months)

Identity Security and Active Directory Specialist working in Tier 0 and critical infrastructure environments, supporting MAPFRE's global insurance enterprise environment through Telefónica Tech. Operates within highly secured Tier 0 identity infrastructure, protecting core authentication services across a large-scale, multi-domain Active Directory environment with 25+ domains spanning multiple Lat

CB

Active Directory and Azure Support Engineer

C6 Bank

Feb 2022 - Jun 2022 (4 months)

Contributed to three projects focused on resolving complex Azure support incidents and improving reliability through operational automation and monitoring. Troubleshot Azure IaaS virtual machine connectivity, deployment, backup and migration issues; supported MFA and Hyper-V/VMware environments.

FC

Senior Infrastructure Support Specialist III

FDS, a DXC Technology Company

Jun 2020 - Apr 2021 (10 months)

Provided specialized infrastructure support and Active Directory account administration for Caixa Geral de Depósitos. Diagnosed and resolved client/server issues; installed, configured and maintained systems, security solutions, firmware and patches.

RS

Senior Infrastructure Consultant

Rumos IT Services

Nov 2018 - Mar 2020 (1 year 4 months)

Supported Fujitsu Remote Infrastructure Management services, including availability, patching, virtualization, incident investigation and ITIL change/release management. Contributed to the deployment of 300 printer driver packages through SCCM for GALP and supported Microsoft Teams and collaboration services for Navigator.

IC

Microsoft Systems Engineer

Indra Company

Apr 2016 - Feb 2017 (10 months)

Administered Active Directory, AD FS, AD RMS, PKI, FIM, Azure MFA, Office 365 and Hyper-V; supported Windows Server and NetVault Backup environments. Supported the São Paulo State Military Police migration from Windows Server 2008 R2/2012 R2 to 2016 across five domain controllers and 100 application servers, including GPO, WSUS and SCCM configuration.

FR

Freelance IT Support

Freelance

Jan 2015 - Apr 2016 (1 year 3 months)

Provided technical support to IT clients.

Education

Degrees, certifications, and relevant coursework

RU

Rumos

Professional Training, Microsoft 365 Identity and Services

2019 - 2019

Training in Microsoft 365 Identity and Services (MS-100) at Rumos in 2019.

GT

Green Tecnologia

Professional Training, Azure infrastructure, SCCM/Intune, Hyper-V/System Center

2016 - 2016

Training in Azure infrastructure, SCCM/Intune, and Hyper-V/System Center at Green Tecnologia in 2016.

ED

EDS

Professional Training, ITIL Foundation and IT asset management

2006 - 2008

Training in ITIL Foundation and IT asset management at EDS from 2006 to 2008.

UI

Universidade Ibirapuera

Degree, Information Technology

1997 - 2000

Degree in Information Technology from Universidade Ibirapuera, Brazil, from 1997 to 2000.

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