Sachin

Strategic and results-driven Senior Engineer with 7+ years of experience architecting and securing enterprise-scale messaging infrastructures for 40,000+ users. Expertise spans Hybrid Exchange, Microsoft 365, and Google Workspace, along with Proofpoint security stack. Proven track record in orchestrating organization-wide DMARC enforcement (p=reject), neutralizing sophisticated phishing threats, and implementing Zero-Trust mail flow via TLS-encrypted connectors.

Adept at leveraging PowerShell, Bash, and Regex to automate complex administrative workflows and high-volume log analysis, significantly reducing operational overhead. A subject matter expert in Identity Governance (Azure AD/Entra ID) and DLP strategy, I am dedicated to maintaining 99.9 percent system uptime while leading global incident response and large-scale cloud migrations in high-pressure environments.

Senior Escalation Engineer at Persistent Systems (Proofpoint) (2025-10 – Present)

• Engineered the seamless integration of Proofpoint (PPS/TAP) with Microsoft 365, configuring MX redirection and outbound smart hosts to ensure secure mail flow.
• Scaled organization-wide DMARC to p=reject, neutralizing domain spoofing and improving global email deliverability.
• Established dedicated Inbound and Outbound Send Connectors with IP-based and certificate-based authentication to prevent open-relay vulnerabilities and unauthorized spoofing.
• Orchestrated the seamless integration of Proofpoint Essentials/Enterprise with Microsoft 365 and Google Workspace, configuring MX record redirection and outbound smart hosts to ensure successful mail flow.
• Managed complex mail routing for hybrid environments, ensuring secure transport between on-premise Exchange servers and cloud gateways using TLS-encrypted connectors.
• Leveraged Proofpoint TRAP via API to automate post-delivery remediation, reducing the "Time to Clean" malicious emails from minutes to seconds.
• Orchestrated secure, TLS-encrypted connectors for hybrid mail routing between on-premise Exchange and cloud gateways, eliminating man-in-the-middle vulnerabilities.
• Deployed Azure AD (Entra ID) connectors to automate user provisioning and ensure security policies are dynamically applied/revoked in real-time.
• Managed Linux-based mail gateways using Bash/Regex-based log parser to diagnose complex delivery failures and harden system security.

Senior Project Engineer at Wipro Limited Systems (Aviation, GCC) (2019-07 – 2025-10)

• Enterprise-Scale Administration: Managed 40,000+ mailboxes, distribution groups, and address lists, ensuring organized and reliable communication channels for a global workforce.
• Successfully resolved 10,000+ high-priority tickets related to email flow, calendar synchronization, and mobile device management.
• Developed custom PowerShell scripts to automate repetitive tasks, such as bulk Distribution List updates and mailbox limit configurations.
• Managed message tracking logs, journaling rules, and litigation holds, ensuring 100 adherence to legal and company data-retention policies.
• Utilized Performance Monitor, Event Viewer to proactively identify and resolve potential service outages.
• Configured mailbox limits and retention policies for optimal storage utilization across the enterprise tenant.
• Managed OneDrive for Business configuration, safeguarding against unauthorized access while promoting easy file sharing among employees.
• Configured and managed Microsoft Teams, including setting up channels, managing team memberships, and integrating with other Office 365 applications.
• Oversaw SharePoint Online sites and libraries, including site creation, permissions management, and customization.
• Created and maintained user guides and documentation to aid in user adoption and troubleshooting.

Master of Technology – Birla Institute of Technology and Science, Pilani (2020 – 2024)

Bachelor of Computer Applications – Bangalore University (2016 – 2019)

Intermediate – Kendriya Vidyalaya Chittaranjan (CBSE) (2016 – 2016)

Matriculation – Kendriya Vidyalaya Chittaranjan (CBSE) (2014 – 2014)