• Lead the planning and execution of network infrastructure upgrades, resulting in improved network stability and performance.• Implemented security measures, including firewalls and intrusion detection systems, reducing security vulnerabilities by 80%.• Managing system admin team, ensuring seamless IT operations.• Collaborate with cross-functional teams to select compatible networking equipment and software.• Implemented cost-effective virtualization solutions, optimizing resource utilization.• Conduct regular network audits to identify and address potential vulnerabilities.• Oversaw system backups, disaster recovery planning, and data retention policies.• Oversaw end-user technical support and training to internal staff on network and system-related issues.

• Managed IT service operations for the Head Office and 13 global entities, ensuring industry-standard compliance.• Proficiently administered Windows and Linux servers, including high-availability Hyper-V clusters.• Oversaw network storage and capacity management, optimizing data handling and storage.• Demonstrated expertise in Microsoft Azure server administration, VM configuration, and disaster recovery backup.• Deployed and configured web servers (IIS, Apache, Nginx) for optimized web hosting performance.• Collaborated with the global IT team to develop and streamline workflow processes.• Managed IT assets, inventory, purchase approvals, and change management.• Conducted quarterly internal vulnerability assessments and oversaw external VAPT processes.• Ensured data security, disaster recovery server backup, and conducted annual disaster recovery drills.• Contributed to information security requirements and yearly ISMS audits, proposing security enhancements.• Maintained system networks, serving 150 systems, and provided user support for 300+ internal users.

• Accomplished network and system security professional with expertise in managing system and network maintenance for a renowned Mobile Banking Financial Service provider.• Proven leadership abilities in prioritizing workloads and distributing tasks among team members to optimize efficiency and achieve project goals.• Contributed to network and system design in a startup venture, demonstrating a strong understanding of infrastructure requirements.• Successfully integrated network and system infrastructure with Bangladesh Bank's upcoming FinTech solution, ensuring seamless connectivity and secure transactions.• Proficient in database administration (MySQL, MSSQL, PostgreSQL) with a focus on data backup, replication, and synchronization.• Skilled in application deployment and troubleshooting using Java, Apache Tomcat, and Python.• Experienced in Gitlab and Jira service administration, facilitating efficient collaboration and repository management.• Managed and maintained virtual server environments (VMware, vSphere, ESXi 6.7, Xen server) with expertise in live server migration, backup, and snapshot management.• Designed and maintained Telco connectivity for Telco USSD service integration.• Ensured system and network security, achieving 99% uptime and implementing robust security measures.• Developed and executed disaster recovery plans, enabling real-time application and data replication for uninterrupted operations.• Configured and managed next-generation firewalls (Sophos, Barracuda, Cisco ASA) to protect data and mitigate threats.• Designed and configured P2P IPSEC over GRE connections with banks, telecom companies, and third-party service providers.

• Work experience in large Enterprise with top-level management to ensure day-to-day flawless IT operation.• Design and develop global office (Dubai, Singapore, Hongkong, etc.) overall network and System architecture. • Supervise and coordinate with the global office IT team on their day-to-day activities. • Design, develop and maintain structured IP network with necessary routes including Routers, Switches, and Optical Fiber.• Coincide with IP transit providers to resolve complex routing and global network path change issues.• Active participation in IIG operations, communicates with multiple upstream providers if any fault arises. Analyze & optimize the global routing paths to ensure the best route. • Strong knowledge of Routing, VPN solutions, OSPF, RIP/RIP2, BGPv4, switching/bridging, spanning tree, leased lines and provisioning, copper and fiber physical cabling plans.• Prepare monthly Network Incident report to analyze and minimize network downtime, performance improvement. • Extensive knowledge of Fortigate, Cisco, Juniper, Maipu, Huawei, and other network and secuirty devices.• Experience in System Analysis, Development and Implementation, Business Analysis, and Project Management.• Linux system installation, configuration, administration, development, and testing of backup and recovery methodologies, capacity and performance planning, performance tuning.• Maintain liaison with vendors for product sourcing, product warranty claim, and other Services.• Expertise in Installing, maintaining, and troubleshooting Microsoft Operating Systems, Microsoft Office 2016 and O365, G-Suite E-Mail, various local and enterprise applications, mobility platforms, server, and VM. • Maintain IT Hardware inventory and disposal process.

• Maintained large area ISP core network to ensure day to day flawless core network operations for the organization.• Planning and analysis of OSPF, BGP, and other IP routing including effective policy for efficient traffic management. • Design, Configure and Maintain Data Network with necessary route including Routers, Switches and Optical Fiber.• Coordinate with support team to solve critical network issues for priority base corporate customer. • Configure and monitor different monitoring tools i.e snmp, nagios, cacti, mrtg, netflow analyzer, flowscan. • Install and setup servers and configure services, setting directories, storage, etc. in accordance with standards and project/operational requirements• Collaborate with the business and hosting provider to perform server and security audits, review system backup procedures, and other recovery processes in accordance with the company's disaster recovery and business continuity strategies• Attend pre sales meeting with customer for technical solutions, technical sales etc.

• Provide onsite and offsite support to most priority corporate clients. • Maintaining communication with customers and attending customer’s technical requirements meetings.• Implementation of WAN infrastructure with optical fiber, E1 circuits, Cisco routers, or switches.• Configure and maintain Linux base Gateway, Proxy, Mail. • Configure Linux based Webmail using Squirrel Mail, Open webmail, Roundcube with well-known pop before SMTP configuration • Relay mails and applies the policy in mail server, configuring anti-spam service and real-time black list checking to fight against SPAM • Coordinate with international Vendors (i.e BT, Expereo, PCCWG, SITA, Amadeus) clients in Bangladesh for installation and configuration of network devices (i.e Router, Firewall box, IPLC box). • On-site Survey, Link Loss, and Link Budget Calculation for various Wireless network establishments.

• Quickly react to network, system monitoring tools and notifications to proactively identify and resolve issues to minimize network/system downtime.• LAN-WAN Configuration including network appliances such as Router, Switches, Hub, Modem and Printer.• Configure Mikrotik Router OS based firewall, Bandwidth controller and Hotspot setup.• Install, upgrade and troubleshoot various OS and their patch as well as client supporting software.• Maintain the System Network with more than 150 System & more than 300 corporate users. • Configure Mailing Software (Microsoft Outlook, Outlook Express, Eudora etc