Developed and maintained a centralized process management platform using .NET Core and React. Key Feature: Web Service Manager Portal

• Designed end-to-end service lifecycle workflows covering provisioning, suspension, renewal, and liquidation for Hosting, Microsoft 365, and HiGioCloud products across Sales, Contract, and Technical teams.
• Architected and developed the FCR (Fast Claim Resolution) system, a comprehensive Post-Sales Management platform using .NET 8 and React 19.
• Built workflows for service suspension, liquidation, renewal, and lifecycle management of digital products and services.
• Implemented automated email workflows for process notifications and approvals.
• Integrated internal platforms (BMS, CM, IAM, Oncall) via REST API to automate service activation removing manual coordination between Sales and Technical teams.
• Optimized API performance to achieve sub-150ms latency and handled high-concurrency traffic of 3,000+ requests per second using Redis and Elasticsearch.

Developed and optimized core .NET services integrated with partner systems, ensuring low latency and stable throughput. 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.
• Optimized SQL Server execution plans and Elasticsearch DSL to improve query performance and indexing efficiency.
• 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. 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.
• Implemented CI/CD pipelines with Jenkins and monitored production services using Elastic APM.

Key Work:

• Developed and tested data management screens for the ERP system.
• Implemented CRUD operations using ADO.NET and SQL Server, optimizing data processing speed.
• Gained experience with MVC framework for backend logic and data flow management.
• Built user interfaces using DevExtreme UI and JavaScript.