$ ls -la ./projects/

Projects & Products

AI products, SaaS platforms, and open-source projects built and operated by Hieu Nguyen.

LCOJ
PRODUCTOPEN SOURCE

Automated online judge & contest platform serving 20,000+ students in Vietnam. Over 1,000 algorithmic problems with official editorials, operated independently on custom VPS infrastructure since 2020.

PythonDjangoVueJavaScriptDocker
Website →GitHub →
Behivest
PRODUCTOPEN SOURCE

Personal finance blog & modern affiliate marketing platform. Features compound interest calculator, SIP planner, budget allocator, MDX content, and full CI/CD.

AstroTailwindCSSMDXTypeScriptVitest
Website →GitHub →
Beli5
PRODUCTOPEN SOURCE

Programming learning platform for kids (Python, Java, C++, Rust) using the ELI5 approach. Friendly design with progressive difficulty for students aged 8-16.

DocusaurusJavaScriptReactMarkdown
Website →GitHub →
NexusAI
PRODUCTPRIVATE

NexusAI

Enterprise Multimodal RAG system for document, image, and video retrieval: custom vector embeddings, hybrid search, and Inverted HyDE indexing.

FastAPIGPT-4VLangGraphChromaDB
LinguistAI
PRODUCTPRIVATE

LinguistAI

4-skill English mock exam platform: LLM-generated reading tasks, Whisper-powered speaking evaluation, and detailed writing criteria feedback.

GPT-4ClaudeWhisperReact
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