About Hai Yen
Senior AI Product Engineer & Data Scientist | Expert GenAI (Multi-Agents, Advanced RAG) & MLOps
- Zero Hallucination: Securing Tool Calling and extraction via Pydantic schemas with self-healing logic (JSON auto-correction).
- Cost Control: Optimizing pipelines (Prompt Caching) and production tracking via LangSmith.
- Production-Ready Code: Properly typed Python, tested, containerized (Docker), and integrated into your CI/CD pipelines.
- Multi-Agent Architectures: Asynchronous agent pipelines (Agno, LangGraph) simulating complex business logic.
- Advanced RAG: Query Transformation modules and vector database indexing (ChromaDB).
- Data Science & ML: Dynamic pricing models, heavy time-series processing, and constraint optimization.
- Full-Stack MVP Systems: Modern applications connecting your interfaces (Next.js) to secure relational databases (Supabase/PostgreSQL, RLS) with Full-Text search engines.
French
Native or bilingual
Experience
- Projet Indépendant / R&D TechAI Architect & GenAI Expert - Multi-Agent System & Advanced RAGMay 2026 - May 2026End-to-end design and deployment of a complex asynchronous B2B multi-agent AI architecture aimed at automating knowledge extraction and business query analysis. Total focus on reliability, determinism, and production observability. Key achievements:
- Multi-Agent Orchestration: Development of an asynchronous pipeline of 7 LLM agents (Agno / DeepSeek) simulating business logic and structured synthesis generation.
- Advanced RAG: Implementation of a Query Transformation module connected to a vector database (ChromaDB) with optimized micro-chunk indexing to handle dense or fuzzy queries.
- Guardrails & Reliability: Securing Tool Calling via Pydantic schemas and implementing self-healing logic (JSON auto-correction) to eliminate hallucinations.
- MLOps & Evaluation: Fine-grained tracking of latency, Prompt Caching via LangSmith, and deployment of an automated evaluation framework (LLM-as-a-Judge).
- Consultante Indépendante / EntrepreneurData Scientist & AI Product Engineer - Data Strategy & Full-Stack MVPMarch 2022 - Today (4 years and 5 months)Technical and strategic support for companies in data valorization, business model optimization, and integration of high-performance software and AI solutions. Key achievements:
- Data Analysis & Dynamic Pricing (Real Estate): Exploiting market data and developing dynamic pricing models to optimize ROI and occupancy rates for real estate portfolios.
- GenAI Automation (E-commerce): Scoping needs and integrating generative AI solutions (OpenAI, Gemini LLMs) for copywriting optimization through advanced Prompt Engineering.
- Full-Stack MVP Focus — "C'mon artisan" Platform: Complete design and development of a geolocation platform for artisans (Next.js 14, Supabase, PostgreSQL). SQL implementation of the Haversine formula for real-time geospatial distance calculation and configuration of a French-optimized Full-Text search engine using GIN indexes.
- Admo.tvSenior Data ScientistOctober 2016 - February 2022 (5 years and 4 months)Paris, FranceR&D and industrialization of the Drive-to-Web attribution engine for the TV analytics leader. Handling massive data volumes and ensuring team production practices. Key achievements:
- Time Series Processing: End-to-end design and industrialization in Python of heavy algorithms (peak detection, Lift analysis) for TV impact analysis.
- Operations Research: Development of a ranking and optimization algorithm under budget constraints with a direct impact on client ROI.
- Engineering Leadership: Technical mentorship of junior profiles and guarantor of production standards (CI/CD, Docker, code reviews, test coverage).
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