Developed and maintained a centralized process management platform using .NET 8 and React 19. Analyzed business requirements and workflows with Business Analysts to design and implement process-driven solutions. Built digital transformation workflows supporting multiple business domains, including Accounting, Technical Operations, Sales, and Customer Service. Optimized system performance and code quality, ensuring low API latency and stable throughput. Collaborated with Business Owners and Product Owners to design and enhance service management workflows. Designed automation workflows with cron jobs, email notifications, reporting modules, and third-party system integrations. Key Feature: Web Service Manager Portal

• Developed and managed workflows for surveying, deploying, and provisioning service products such as Hosting, OnCall, Trial Services, Microsoft Service Packages, and HI GIO Cloud.
• Built workflows for service suspension, liquidation, renewal, and lifecycle management of digital products and services.
• Implemented automated email workflows for process notifications and approvals.
• Developed reporting workflows for product and service management.
• Designed and implemented cron-job based automation to streamline operational workflows.
• Integrated the platform with third-party internal and external systems.
• Improved system scalability, performance, and maintainability through code optimization and architecture improvements.

Developed and optimized core .NET services integrated with partner systems, ensuring low latency and stable throughput. Applied Design Patterns and System Architecture Principles such as Observer Pattern, Singleton, Message Queue Pattern, Domain-Driven Design (DDD) for scalable and maintainable system design. Implemented CI/CD pipelines with Jenkins and monitored production services using Elastic APM to improve deployment efficiency and system reliability. Key Feature: Integration with Vendor Web Services

• Integrated various vendor services, including bill payments (Payoo, SmartPay, Epay, FTEL,..), software key distribution (PSD, FPT Play, HTECH,…), mobile top-up and recharge, and SIM FPT activation and sales, ensuring smooth transactions and efficient system performance.
• Resolved technical debt by upgrading the system from .NET Core 2.1 to .NET 6, improving performance, security, and maintainability.
• Optimized SQL query execution plans, improving indexing efficiency, minimizing round-trip time, and enhancing overall query performance.
• Refactored APIs to reduce latency (under 200ms), increase throughput, and optimize microservices performance, enhancing scalability and system resilience.
• Reduced service bottlenecks during peak transaction periods, enhancing system performance, throughput, and responsiveness.
• Handled concurrent transactions using the Pub/Sub Pattern, ensuring data consistency. Key Feature: Operation Assistant Tool
• Reduced operational workload by 50%, making system management more efficient for operators.
• Automated reconciliation tools, reducing the workload for the reconciliation department by 80%, eliminating manual errors, and minimizing financial risks.
• Improved error detection by providing detailed vendor error messages, enabling faster resolution through vendor support channels.

• Developed and optimized data import workflows for ERP system using ADO.NET and SQL Server — improving data processing speed and reducing query execution time.
• Built and tested backend modules following MVC architecture, contributing to data flow reliability and system maintainability.