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Duy Hoang Long

Jobcan Payroll Management – Vietnam (Cross-functional Team of 5)

• Designed and implemented Vietnam Personal Income Tax declaration system (Form 05/KK-TNCN — monthly withholding, Form 05/QTT-TNCN — year-end finalization), handling income aggregation, deduction rules, payroll-tax reconciliation, and multi-branch reporting for enterprises with 1,500+ employees.
• Built full-stack workflows for creating, listing, searching, validating, and exporting tax declarations using Ruby on Rails (RESTful APIs, service objects, Pundit authorization) and React/Redux (redux-form) on the frontend.
• Provisioned AWS infrastructure using Terraform (SQS, IAM, compute, networking).
• Built asynchronous processing pipelines using Shoryuken and Amazon SQS; leveraged ElasticMQ for local queue emulation to support development and integration testing.
• Containerized application services with Docker and implemented CI/CD pipelines using CircleCI for automated build, unit test.

Enterprise Web Ecosystem: Donuts Corporate & Jobcan Product Suite (Team Lead)

• Led a 3-member engineering team using Agile/Scrum methodologies through the full SDLC, delivering scalable TypeScript solutions based on Japanese business requirements.
• Architected automated CI/CD pipelines and hosting using AWS Amplify for Next.js applications, enabling secure, zero-downtime releases.
• Optimized performance using Next.js (SSR/SSG) and advanced caching, significantly reducing page load times and improving SEO metrics.
• Mentored fresher engineers via rigorous code reviews and technical training, boosting team sprint velocity and independent problem-solving.

• Independently developed Supermetric, a custom e-commerce analytics platform using ASP.NET and a microservices architecture to aggregate and visualize monthly sales data from multiple platforms (Shopee, TikTok, Dien May Xanh).
• Developed robust Python web scraping pipelines to automate data extraction, leveraging the collected datasets to train AI models for advanced business insights.
• Designed and deployed the end-to-end data processing workflows and full-stack application architecture on Azure Cloud Virtual Machines.

Social Media Platform Project (Cross-functional Team of 5)

• Engineered a scalable backend utilizing C# Microservices, implementing RESTful APIs and asynchronous event-driven communication via RabbitMQ.
• Designed the social graph architecture using Neo4j for optimized relationship querying, alongside SignalR for real-time chat and notifications.
• Containerized the ecosystem with Docker and deployed to Azure Cloud (App Services, SQL Database, ACR), ensuring high availability.
• Automated build, test, and deployment workflows by establishing CI/CD pipelines via CircleCI.

HexaSync Integration Platform

• Configured automated data synchronization workflows across distributed business systems (ERP, CRM, POS) utilizing the HexaSync platform.
• Monitored and optimized data pipeline performance to ensure seamless, real-time system integration.