LE THANH PHONG (Phong Lee)
Software Engineer — Javascripts, TypeScript, React/Vue, Next.JS, Node.JS, Python
Summary
Software Engineer with expertise in Javascripts/TypeScript, React/Vue, Next.js, Node.js, Python, REST/GraphQL APIs/gRPC. Experienced in building scalable systems, optimizing performance, automating workflows, and delivering production software.
Profiles
Github
LinkedIn
Facebook
Youtube
Experience
Arobid
Vietnam
AI Software Engineer
Apr 2026 – Present
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Engineered an asynchronous hybrid search service in Python (FastAPI, AsyncIO) integrating sparse BM25 retrieval and dense vector indexing with multi-vector payloads in Qdrant using embedding models (Qwen3-Embedding, Jina-Embeddings).
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Built an event-driven data-pipeline ingestion consuming Kafka streams, combining LLM structured outputs and regex validation to extract, clean, and map unstructured data into production-ready schemas.
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Builded golden datasets across AI products, measuring search precision (Hit Rate@K) and AI agent (Answer Relevancy, Faithfulness, Task Success Rate) via LLM-as-a-Judge and rule-based tool checks.
HiliosAI
Finland
Software Engineer
Jun 2023 – Feb 2026
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Engineered an omnichannel AI conversational interface in Next.js/TypeScript, integrating real-time WebSockets for web chat alongside asynchronous Webhook handlers to ingest messaging streams from Zalo, Facebook Messenger.
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Built www.hilios.ai in Next.js and Tailwind CSS, leveraging Server Actions and React Query for real-time conversation.
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Engineered multi-turn AI agent using LangChain, implementing prompt engineering, guardrail classification, automated escalation rules, and human support transfer.
OTBZone
Viet Nam
Software Engineer
Oct 2022 – Apr 2023
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Engineered frontend features for an E-commerce platform using Vue.js and TypeScript with SSR-rendered, integrating RESTful APIs for product search, inventory updates, and checkout flows.
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Implemented admin portal workflows, role management, and guard routes in Vue/TypeScript, collaborating with backends engineers to define contract API schemas and integration.
LTV Software Co.
Viet Nam
Software Engineer
Feb 2021 – Oct 2022
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Initiated software engineering career building modular micro-frontend apps with Vue 3, Vite, and Pinia, designing reusable UI component libraries to maintain cross-app and feature deployment.
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Lead Frontend for engineer internal tools and core software library templates, and feedback collection.
Projects
Arobid Search Engine | | AI Software Engineer
Apr 2026 – Present
Built hybrid search and indexing infrastructure Deep Search, RFQ Buyer Matching, and multi-modal product/supplier discovery across 5M+ RFQs and 2M+ products.
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Hybrid Retrieval & Ranking: Engineered search workflows combining Qdrant vector embeddings, BM25 keyword retrieval, structured filters, and re-ranking.
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RFQ Matching Engine: Engineered multi-step AI discovery pipelines connecting business buyers with relevant suppliers and products to increase matching request.
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Prompt Engineering & RFQ Parsing: Engineered structured prompt and schema-enforcement techniques to parse raw, free-text user queries into valid search parameters boosting RFQ translation accuracy from 78% to 100% across a 350 sample golden evaluation dataset.
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Data Pipelines: Engineered processing and indexing pipelines for data preparation and search consistency.
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Evaluation & QA: Built benchmark query datasets to perform regression testing across search cases.
AI Company Onboarding Engine | AI Software Engineer
Apr 2026 – Present
Engineered Quick Onboarding and Deep Onboarding multi-step LLM workflows to automate company profile extraction, enrichment, and product catalog expansion.
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Quick Onboarding Workflow: Built LLM-based web scraping and parsing pipelines to extract and structure company schema from a single URL.
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Deep Enrichment Engine: Developed multi-step LLM workflows to validate, enrich, and structure extended business information.
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Catalog Expansion: Scaled product discovery from 5–10 to ~100 products per company through deep-crawling classification strategies.
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Impact & Scale: Automated onboarding for 5,000+ businesses.
AI RFQ Chat Agent | AI Software Engineer
Apr 2026 – Present
Engineered a multi-turn conversational AI agent utilizing LLMs, tool-calling, and workflow orchestration for features product discovery and RFQ CRUD.
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Agent Orchestration & Context Management: Built multi-turn conversation logic, RFQ state management, and tool-calling for product and supplier searching and create/update/delete RFQ matching.
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Evaluation & Benchmark: Constructed multi-turn datasets to test context answer accuracy, tool execution.
Engineered and delivered a production-ready live chat assistant and lead-capture platform deployed across AIT Universities & Schools websites.
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Feature Engineering: Built end-to-end enrollment workflows, real-time chat, and lead routing modules using React.js, TypeScript, Node.js, GraphQL.
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Embeddable Frontend Widget: Engineered live-chat widget embedding directly into web sites.
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Ingestion & Search Pipelines: Developed crawler and data processing pipelines to chunk, format, and prepare school web content data for retrieval.
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Workflow Automation: Automated inquiry classification to reduce manual support from ~20 down to ~2 daily during normal periods, and from ~89 down to ~7 key cases during peak enrollment windows.
Landing Page & Sales AI Agent at HiliosAI | Core Software Engineer
Mar 2024 – Present
Engineered a high-performance landing page and automated AI sales assistant that drives end-to-end visitor → lead → demo booking conversion.
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Full-Stack Engineering: Built landing pages and lead intake flows using Next.js, Node.js, React, Tailwind CSS, and GraphQL.
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SEO & Web Performance: Implemented Server-Side Rendering (SSR), structured metadata, and reusable server components, achieving 100 Lighthouse SEO scores.
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Workflow Automation & Slack Integration: Built real-time lead event integrating AI agent outputs with Slack alerts and automated calendar scheduling, cutting manual work from ~30 to ~10 high-intent cases/day.
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AI Agent custom output messaging: Delivered custom messaging formats and automatic lead capture (email, phone, conversation summary) to automate demo booking workflows.
OASIS | Frontend Engineer
Oct 2022 – Present
Led frontend and UI development for a fleet maintenance system, enabling real-time equipment tracking and vessel-to-shore synchronization.
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Frontend Engineering: Led development using Vue.js and TypeScript to build multi-step workflows for equipment tracking and maintenance task updates.
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Sync Workflows: Engineered real-time monitoring for vessel-to-shore data synchronization.
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Bundle Optimization: Reduced frontend bundle size by ~687 KB by implementing route-level code splitting, and applying lazy loading.
Project Template & Component Template | Frontend Engineer
Aug 2022 – Nov 2022
Led frontend implementation include UI design system, speed-up project setup and cross-team development.
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Engineering Design System: Built a modular, customizable component library and template using Vue 3, TypeScript, and Element Plus and Tailwind CSS.
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State Management: Standardized state management across projects using Pinia, providing reusable store modules for auth, user sessions, and global UI states.
Awards
Real-Time Online Exam Proctoring System – University Research Award
Mar 2023
Nha Trang University
Led the design and implementation of a real-time online exam monitoring system utilizing computer vision and environmental detection to ensure academic integrity. The system included:
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Face recognition and gaze tracking to identify off-screen behavior and monitoring to detect unauthorized individuals or suspicious movements.Continuous system status checks for exam integrity and anomaly detection.
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Recognized by Nha Trang University for outstanding technical innovation and real-world impact in applying AI for education security and supervision.
Education
Nha Trang University
Engineer’s Degree • 7.6 GPA
Information Technology
Oct 2018 – Sep 2022
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Graduated with an Engineer’s Degree in Information Technology from Nha Trang University, specializing in software development and computer systems.
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Maintained an overall GPA of 7.6 / 10, ranking among the top students in the program.
Languages
English
Advanced proficiency in speaking, reading, and writing
Vietnamese
Native / Fluent