hieu@behitek:~ $ whoami

Hieu Nguyen

Agentic AI · Natural Language Processing · AI in SDLC

8 years of bringing AI into production: building Enterprise Agentic AI & RAG systems, deep Natural Language Processing (NLP), and AI-driven full-stack software delivery (AI in SDLC). Engineering both the models and robust infrastructure.

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Hiếu Nguyễn
KEY CREDENTIALS
🌟 Top 30 VMO Employee
🎓 Master's @ JAIST
🏆 1st Rank ALQAC 2022
8 Yrs
production AI experience
3
companies shipped AI products to production
4 Awards
national AI & algorithm honors
20.000+
active platform users
01 / SPOTLIGHT

Featured AI Project

NexusAI: Enterprise Multimodal RAG & Inverted HyDE

Intelligent Knowledge Retrieval Across Enterprise Documents

Enterprise document repositories (PDFs, Office files, images, videos) often suffer from vocabulary mismatch between user queries and raw documents. NexusAI introduces Inverted HyDE (pre-generating hypothetical queries during offline indexing to map retrieval into Query-to-Query matching, eliminating runtime LLM latency) combined with hierarchical document chunking and grounded generation with precise source citations.

Inverted HyDE
Query-to-Query matching eliminates runtime latency
Multimodal
Processes PDF, Office, Image & Video files
100% Grounded
Direct source citations in generated responses
Read Inverted HyDE Article →RAG in Production Best Practices →Consult Enterprise RAG Solutions →
INVERTED HYDE & MULTIMODAL INDEXING PIPELINE
Document Parsing & Hierarchy
Preserve hierarchical structures (pdf, images, videos, office files)
Inverted HyDE Indexing
Generate hypothetical queries offline (Query-to-Query matching)
Sub-second Retrieval
Dense Vector + BM25 + Cross-Encoder Re-rank
Grounded Answer Generation
Grounded responses with accurate citations, zero hallucination
02 / PROJECTS

Featured Products

OPEN SOURCE
20,000+ USERSFLAGSHIP

LCOJ

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
View details →
PRIVATE
4-SKILL EVALUATION

LinguistAI

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

GPT-4ClaudeWhisperReact
View details →
OPEN SOURCE
FINTECH & TOOLING

Behivest

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

AstroTailwindCSSMDXTypeScriptVitest
View details →
View all projects (ls ./projects) →
03 / SERVICES

Core Expertise

/en/services/aiFLAGSHIP

Agentic AI & NLP

Building AI Agents, RAG, NLP from PoC to production, agentic architecture, and system optimization.

  • ›Agentic Workflows & Tool Calling
  • ›NLP, Embeddings & Hybrid Search
  • ›Model Evaluation & Benchmarking
View service details →
/en/services/software

AI in SDLC & Full-stack

Applying AI across the entire software development lifecycle (AI in SDLC), accelerating products from idea to production.

  • ›AI-Driven Full-stack Development
  • ›Backend APIs & Microservices
  • ›DevOps, Docker & K8s Infrastructure
View service details →
/en/services/online-judge

Online Judge (DMOJ)

Deploying and operating automated Online Judges for schools and coding academies.

  • ›DMOJ Installation & Customization
  • ›Sandboxed Judge Operations
  • ›Automated Grading & Problem Sets
View service details →
04 / BLOG

Articles & Insights

ls ./blog →
September 7, 2025AI/ML · ENInverted HyDE: Solving Real-World Dense Retrieval Challenges→August 31, 2025PYTHON · ENStop Using requirements.txt→November 23, 2024AI/ML · ENFine-tuning Flux.1-dev LoRA on yourself→
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