Experience

Link3 Technologies Limited

• Bangladesh
• Information Technology & Services
• 700 & Above Employee

• Assistant Manager, NOC, Technical Department

  • Feb 2022 - Present

  i. Managing Authoritative & Anycast Caching DNS Servers (Authoritative: Bind 9.11, Caching: Bind 9.11). Maintaining Secure DNS Zone transfer by implementing TSIG. ii. Maintaining Monitoring Related Service i.e. Nagios, LibreNMS, Smokeping, rsyslog, Cacti & Netbox. iii. Managing Zimbra Collaboration Mail Server & Expertise on Linux Mail Server using postfix. E-mail Marketing with bulk Mail Service with (DKIM, SPF, DMARC). Using Backup & Restore Script for mailbox. iv. Expertise with Anti-Spam mail filtering such as Barracuda. v. Expertise on Security & Log Analysis Service - SysLog, Netflow & Nfsen, Prometheus, Grafana, Elastic Stack ( Logstash, Kibana and Elastic Search 7.0 ). vi. Experience with VMWARE Solution-VSphere, ESXi, VCentre. vii. Using allot for bandwidth Management. viii. Managing TACACS+ server for Central Device Authentication by privileged user groups for Cisco & Juniper devises. Show less



DigiCon Telecommunication Ltd

• Telecommunications
• 1 - 100 Employee

• Server & System Administrator, Operations MiME

  • Feb 2021 - Aug 2021

  i. Deploy & Managing Authoritative & Caching (Load Balancing) DNS Servers (Authoritative: Bind 9.11, Caching: Bind 9.11, Unbound 1.12, load balancer: dnsdist 1.4.0). Maintaining Secure DNS Zone transfer by implementing TSIG. Using DNS RPZ on Bind 9.11 & Unbound 1.12 for block 30000+ porn sites & Blocking Ads with redirect to custom webpages. Deploy DNS Load Balancer, Failover, ACL for IP Blocking/Passthru, DOH & DOT using Let’s encrypt certificate & Domain Blocking using dnsdist 1.4.0 with Lua scripting. Also Managing Windows DNS for local zones under authenticated Active Directory users. ii. Managing Fastnetmon Server for DDOS attack detection & mitigation with BGP blackhole. Using python script to delete old data from clickhouse database. iii. Implement and maintenance MRTG graph Servers using Cacti 0.8.7i & 1.2.16 with Plugins: Weathermap, nectar, Monitor, Thold, Reporting for ISP & IIG. iv. Deploy TIG Stack (Telegraf, InfluxDB, and Grafana) Server for Juniper SysLog Management with custom dashboard using Grafana with built in searching feature as well export logs into MS Excel reporting by custom app service, log severity, date & device wise. v. Netflow Log Management Using NfSen & nfdump, Elastic Stack (Logstash, Kibana and Elastic Search 7.0 ) vi. Maintaining Solarwinds, Nagios & Smokeping for Network performance monitoring. vii. Maintaining Synology RS18017xs+ Server, VMware vSphere 6.0 ,6.5 & 7.0 Servers with Synology iSCSI connected storage for VM backups. viii. Deploy Central Device Authentication (AAA) for Mikrotik by privileged user groups using FreeRadius 3.0 with MySQL backend with Custom GUI. ix. Managing Lancache server for game caching as well deploy dns forwarder rules to redirected mime users who use mime dns will auto redirected to the cache server for better gaming experience. x. Deploy Bandwidth Test Server (bt.mimebd.com) using www.nperf.com as well custom plugin for mobile devices. Show less



ADN Telecom Limited

• Bangladesh
• Telecommunications
• 200 - 300 Employee

• Assistant Manager, Core Network

  • Oct 2018 - Jan 2021

  i. Managing and Maintenance Different Domain Hosting/Registration Server service ( GoDaddy,Namecheap, OnlineNic, Glowhost, Digital Ocean, cPanel) & Cloud Services (AWS,Digital Ocean, G-Suite). ii. Managing Dual Stack DNSSEC Authoritative DNS Server (Bind 9.9, PowerDNS 4.1 with MySQL GUI, Caching: Bind9, Unbound, Dnsmasq). Maintaining Automate DNSSEC key rotation (ZSK Key Rollover, KSK Key Rollover, KSK Emergency Rollover) with DNSSEC Extensions TLSA and DANE with let’s Encrypt certificates, SSHFP, CAA & Dynamic DNS with bind and nsupdate via HTTP.iii. Maintaining Postfix, Zimbra Mail Server using Let's Encrypt for SSL Certificate with Multiple SSL Certificates on SNI, SPF, DKIM, DMARC on Multi-Domain. Using Policyd for anti-spaming, SpamAssassign, Clam-AV, Greylisting, Sieve, MailScanner. Using Backup & Restore Script for mailbox.iv. Maintaining HA Cluster Service on Cenos7 using Pacemaker & Corosync for Failover, Fencing, Shared Storage, Quorum. Managing DRBD & GFS2 File System for webserver, MySQL service.v. Hands-on experience on Ansible & Ansible Tower for automation of Linux Servers and Cisco Routers.vi. Managing Cacti / MRTG Graph monitoring Servers. Developed Customize Shell script to createautomatic graph for new interface and device per day as well weekly automated backup of RRDfiles, Configuration & Databases with Remote location backup.vii. Maintaining Hotspot & Radius Server using DMA Soft LAB with API based smsgateway integration & PRE-Paid Card recharge module (used in HSINA Airport, Police Plaza, Fardipur Zone). viii. Developed Custom Script for 300+ Mikrotik and Juniper, Linux Services (cacti, DNS, MySQL )FTP based active backup with custom email message which will inform Added of New deviceinto device backup as well Unable to backup device details.ix. Developed Custom TCL except script for Cisco IOS / Juniper to push automated route anddefault necessary configuration. Also implement automatic Kron scheduler for tftp/ Ftp basedbackup. Show less

• Senior Engineer, Core Network

  • Oct 2014 - Sep 2018

  i. Implement and maintenance MRTG graph & creating the cacti graph for clients. DevelopedCustomize Shell script to create automatic graph for new interface and device per day as wellweekly automated backup of RRD files, Configuration & Databases.ii. Developed Custom Script for 300+ Mikrotik and Juniper, Linux Services (cacti, DNS, MySQL)FTP based active backup with custom email message which will inform Added of New deviceinto device backup as well Unable to backup device details.The basic configuration of switches and routers e.g., VLAN, NAT, DHCP, STP. Configuringrouting (static, default, RIP, OSPF, IGRP, EIGRP, i-BGP and e-BGP etc.) in IPv4.iii. Configure policy based routing in Firewall (DPI), ACL create, URL filtering, IP Blocking,implement security policy.iv. Host Ookla Speedtest server (www.speedtest.net) for Bandwidth Test.v. Troubleshoot routing, ACL issues and Implement basic router security. Show less



iNode Services Ltd.

• Bangladesh
• Computer and Network Security
• 1 - 100 Employee

• Systems Administrator

  • Nov 2013 - Oct 2014

  Responsibilities: i. Design & Implementation of Network Systems as per user requirements. ii. Maintenance of “iLoad System" (www.iload.inode.com.bd) and "AmarID" (www.amarid.com) Web Servers and their database servers with replications other additional servers. iii. Setup and maintenance of office network, which is highly protected from hacking and virus infection by cutomized Active Directory solutions. This system is called VHPS product of iNode Services Ltd. iv. Maintenance of MikroTik Router (RB450G) configured as Web-Proxy, also managing bandwidth using simple Queue. v. Purchase / Maintain the inventory of related hardware assets. Show less



Arla Foods

• Food and Beverage Manufacturing
• 700 & Above Employee

• Systems Administrator

  • May 2013 - Oct 2013

  Responsibilities: i. Maintenance of “Windows Server 2008 R2 on IBM Servers ” configured as Domain Controller, File Server, Print Server, Storage & Quota Management with replications other additional servers. ii. Managing Thecus NAS 4200 device as a backup storage.Setup and maintenance of office network, which is highly protected from virus infection by Kaspersky Anti-Virus Server Edition 8.0 . iii. Maintenance of MikroTik Router (RB450G) configured as Web-Proxy, also managing bandwidth using simple Queue. iv. Managing Site to Site VPN, PPTP & Data Connectivity connection configured in MikroTik Router (RB450G) from Dhaka to Gazipur, Kasimpur. v. Managing Finger/Access Control Device ANVIZ VF-30. vi. Installing and configuring Tally 9.0 in domain & workgroup environment. vii. Maintaining Panasonic KX-TDA100D Hybrid IP-PBX system. viii. Coordinating with hardware vendors in case of hardware failures and manage through to resolution via SLA. ix. Purchase / Maintain the inventory of related hardware assets. Show less



National Polymer Group

• Bangladesh
• Plastics Manufacturing
• 100 - 200 Employee

• Senior Executive, IT & MIS

  • Dec 2012 - Apr 2013

  Responsibilities: i. Design & Implementation of Active Directory Network Systems , Group Policy in Windows Server 2008 R2 as per management requirements. ii. Maintenance of “Windows Server 2008 R2 on IBM Servers” configured as Domain Controller, File Server, Print Server, Storage & Quota Management with replications other additional servers. iii. Setup and maintenance of office network, which is highly protected from virus infection by Kasper sky Anti-Virus Server Edition 8.0. iv. Maintenance of MikroTik Router (RB450G) configured as Web-Proxy, also managing bandwidth using simple Queue. v. Managing Site to Site VPN, PPTP & Data Connectivity connection configured in MikroTik Router (RB450G) from Dhaka to Tongi, Chittagong, Bogra & Bhaluk. vi. Coordinating with hardware vendors in case of hardware failures and manage through to resolution via SLA. vii. Purchase /Maintain the inventory of related hardware assets. Show less



A.P. Moller - Maersk

• Denmark
• Transportation, Logistics, Supply Chain and Storage
• 700 & Above Employee

• Systems Specialist

  • Jan 2008 - Aug 2012

  a) Deployed at Maersk Bangladesh Ltd (Maersk Line) , WSM (Work Space Management) -BAN Team for CyberNet Responsibilities: i. Managing User Accounts in Active Directory/ Exchange in windows 2003 & Exchange 2003 Server. ii. Providing access to local Server-based systems, File server, Groups for Users & ensuring availability. iii. Managing Print Server & Network Printers, Using DHCP Server Configuring reservations and Scopes. iv. Provide 2nd and 3rd level problem resolution (which can’t be resolved remotely and requires hands on intervention) v. Tape Device and backup tapes management. vi. Coordinating with hardware vendors in case of hardware failures and manage through to resolution via SLA. vii. Building / Imaging PC using SCCM Server via Remedy. viii. Help desk support for users assigned via Remedy. ix. Create/Maintain the inventory of Maersk IT related hardware assets. x. Developing Customize Software's For Mods(Main Frame) Using Visual Basic 2005 Dot Net Framework 2.0 xi. Developing Excel Macro for Custom Reporting. b) I also worked in Novertis (Bangladesh) Ltd for CyberNet Responsibilities: i. Help desk support for users ii. Field Laptop Management for support & maintenance iii. Deploying Security Policies iv. Documentation of software uses v. Backup & Recovery of Data Show less



JUBO KARMASANGSTHAN SOCIETY (JUBOK)

• Dhaka, Bangladesh

• Senior Executive

  • Jul 2003 - Dec 2007

  Network Integration: 1) Set up and maintaining Server in Windows-2003 with active directory service for domain user authentication, Deploying Software/Service Using Group Policies, Using DHCP Server Configuring reservations and Scopes. 2) Using RedHat Linux as a Gateway & Firewall. All the services like Squid, DNS, Web, FTP, IPTables etc..Configured On Linux. 3) Using Microsoft Exchange Server 2003 as a mail server. Software Integration: Developing/Upgrading Software's & Customizing Reports per requirement Using Clipper & Dbase, Ms Excel & Access based programming, Graph Chart & other projected/Budgeted Calculation. a. Developed Software's Using VB6 & Access97 : i) " Housing Passbook & Deed Programme. ( in Bangla ) " ii) " Computer Peripherals Information " iii) " Personal Skill & Information System " iv) " Short Term Loan Receiving ( STL )" Show less



DINI BOHUMUKHI SAMOBAY SAMITI LTD.

• Software Engineer

  • Dec 2000 - Aug 2002

  Developed FoxPro(Dos) based software's: i) " Clients Profit Distribution System " ii) " Loan Payment and Rebate Calculation Calculator " iii) " Higher Purchase Loan Tracking System " Developed FoxPro(Dos) based software's: i) " Clients Profit Distribution System " ii) " Loan Payment and Rebate Calculation Calculator " iii) " Higher Purchase Loan Tracking System "