Muhammad Umar

Full-Stack Developer

Building full-stack web applications, e-commerce platforms and multi-tenant systems using Next.js, TypeScript and Node.js.

• Built a production-ready Next.js 15 e-commerce platform with OTP-based checkout, order management and localized payment integration.
• Designed and implemented a multi-tenant POS backend using Node.js and Prisma with entities for products, tax groups, barcodes, parties, custom attributes and multi-location stores.
• Created secure authentication flows using BetterAuth, sessions and OTP verification, including role-based access control.
• Developed React interfaces using Tailwind CSS and shadcn/ui focusing on usability, responsiveness and maintainable components.
• Built Node.js services for data sync, sales ingestion, log processing and scheduled jobs integrated with SQL Server and PostgreSQL.
• Maintained CI/CD pipelines in Azure DevOps, automating build, testing and deployment behind Cloudflare Tunnels with R2 storage.

Infrastructure & DevOps Engineer

Designing and managing infrastructure, networks and DevOps automation for retail and industrial environments.

• Designed and deployed infrastructure for 400+ locations including networks, servers, CCTV and automation systems.
• Built network topologies using Cisco, UniFi, Ruijie and Sophos with VLANs, routing and enterprise Wi-Fi with focus on relabilty for harsh environments.
• Managed data centers, Windows Server environments, Hyper-V virtualization and storage with backup and DR strategies.
• Implemented monitoring using LibreNMS with Redis caching, custom dashboards and alerting for 500+ devices.
• Automated deployments and maintenance using PowerShell, Bash and Node.js, reducing manual effort and downtime.
• Provided incident response and SLA-based support for mission-critical environments handling real transactions.

Senior System Administrator / Technical Support Engineer

Managed Windows, virtualization, firewalls and collaboration platforms for large user bases across multiple locations.

• Managed Windows Server and virtualization environments.
• Supported firewall, mail and collaboration platforms.
• Laid the foundation for current focus on DevOps and full-stack development.