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Vu Nguyen Long

@vunguyenlong

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Full-stack Engineer building ERP, BI, and AI automation products with React, Node.js, Java, and .NET.

Vietnam

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At Pratek, I delivered business modules for a distributor management system and built Java APIs for order, return, and report flows. I also worked on an e-invoice platform and a secure BI portal, where caching reduced redundant API calls by an estimated 40%.

As a freelance Full-stack Developer, I help product teams expand an HRM product into an ERP platform and develop its warehouse system. I also build BI SaaS features and connect React frontends and Node.js APIs to n8n workflows and OpenAI and Claude APIs.

Experience

Work history, roles, and key accomplishments

Current

Full-stack Developer

Current

Freelance

Apr 2024 - Present (2 years 6 months)

Long-term delivery partner for product teams and clients, including two Top Rated Upwork freelancers since 2025. Built features across React/TypeScript clients and .NET and Java backend services for an ERP platform, and developed a warehouse system with Java and React. Built frontend and backend features for a BI SaaS platform, connecting scraping and data workflows. Built React frontends and Node

React TypeScript .NET C#Java REST APIs NodeJS Python Web Scraping Data Pipelines N8n OpenAI Claude AI Agents Prompt Engineering

Full-stack Developer

Pratek

Feb 2025 - Jun 2026 (1 year 4 months)

Delivered 5 business modules end to end for a distributor management system, built Java REST APIs, and added real-time notifications. Built Java backend APIs for an e-invoice platform with Next.js server-side proxy routes, and shipped SSR/SSG pages tuned for Core Web Vitals. Built the report access flow for a BI portal with .NET APIs and Azure AD SSO, reducing redundant API calls by an estimated 4