EXPERIENCE

CHALDAL LIMITED | INFRASTRUCTURE SOFTWARE ENGINEER
LARGEST ONLINE GROCERY SERVICE IN BANGLADESH (10M+ CUSTOMERS)
March 2023 – Present | Dhaka, Bangladesh
• Infrastructure Maintenance
  • Managed 40+ mixed Windows and Linux servers across 4 data centers, achieving >99.9% availability.
  • Maintained networking across 4 data centers, 2 offices, and 22 warehouses.
  • Upgraded DB server storage with RAID to improve IOPS and fault tolerance.
  • Installed/configured a gateway switch to create a redundant gateway path.
• Application Deployment
  • Designed and operated production Kubernetes clusters across multiple data centers running 50+ microservices.
  • Automated CI/CD pipelines in Azure DevOps integrating container build, registry publishing, and Kubernetes deployments with zero-downtime rollouts.
  • Managed Kubernetes networking, TLS certificates, secrets, and service exposure through Ingress and internal routing.
  • Troubleshot complex production issues involving cluster networking, API connectivity, and pod lifecycle failures.
• Cloud Infrastructure – Microsoft Azure
  • Managed Azure cloud resources including Virtual Machines, networking, and storage supporting production workloads
  • Automated infrastructure and operational tasks using Azure CLI, Service Principals, and Azure DevOps pipelines.
  • Implemented monitoring and diagnostics using Azure Application Insights for production applications.
  • Saved $1,000/month via Azure cost optimization (Re-architected Azure Storage network path (Private Endpoint → secure Public access with allow-listed networks to eliminate Private Link charges)
• Database Maintenance
  • Configured a 4-replica SQL Server Availability Group for continuous service.
  • Implemented automated onsite backups (20+ DBs) with a 99.9% success rate and encrypted offsite copies in Azure, reducing RPO to <15 min.
  • Deployed air-gapped backups on isolated servers, ensuring extra security.
  • Reduced backup storage by 50% via automated cleanup and a custom backup cleaner.
• Identity & Directory Services
  • Set up on-prem AD → Azure AD (Entra ID) synchronization.
  • Deployed an offsite Read-Only Domain Controller (RODC) to improve security and local authentication.
  • Integrated 160+ workstations for seamless domain access, automated software installs via GPOs.
• Monitoring & Logging
  • Deployed a self-hosted Checkmk stack for hosts, apps, database backups, networks, and hardware.
  • Set up Azure Application Insights and Log Analytics, configured 20+ alerts for cost spikes and app issues
  • Integrated SQL Server logs with Azure Arc for centralized monitoring.
• Automation and Documentation
  • Authored 30+ PowerShell, Bash, and Python scripts to automate patching, backup rotation, and certificate renewal, cutting repetitive workload by 30%.
  • Developed and maintained 25+ SOPs and runbooks (backup validation, incident response, VM provisioning), accelerated onboarding for junior admins.

SKILLS

• Platforms and Tools

  • Kubernetes, Helm, Docker, Service Fabric
  • Hyper-V
  • Azure DevOps CI/CD
  • Ansible

• Cloud (Azure & AWS)

  • Azure VMs, VNets, NSGs/Firewalls, Route Tables
  • Azure Storage (Blob, immutability, lifecycle management)
  • Private Endpoints vs. secure Public access
  • Azure Arc
  • Log Analytics & KQL, Application Insights
  • Azure Monitor alerts
  • AWS EC2, RDS, S3

• Operating Systems

  • Windows (Windows Server 2019/2022)
  • Linux (Ubuntu Server 20.04/24.04)

• Identity Services

  • Microsoft Active Directory
  • Azure Entra ID

• Networking

  • Load Balancers, WireGuard VPN
  • DHCP / DNS, BGP

• Scripting

  • PowerShell, Bash, Python

• Monitoring

  • Checkmk, Azure Monitor

• Databases

  • SQL Server 2019 / 2022
  • High Availability Clustering
  • DB Backups Management
  • SSRS
  • Redis Stack

• Language and Framework

  • C#, F#, Python, Java, ASP.NET Core

EDUCATION

UNIVERSITY OF DHAKA
B.Sc. IN COMPUTER SCIENCE AND ENGINEERING
Jan 2018 – Dec 2022 | Dhaka, Bangladesh