NGUYỄN HỒNG QUÂN

MODEC | DNA

Senior Software Engineer

- [Bing] Search & Document Viewer Platform(React/Next.js, Node.js, Azure).

• Cut average retrieval latency 30 % and raised relevance score 25%.
• Fetching metadata from file changes via API.
• Made worker count extensible using /healthcheck API and Azure Monitoring.
• Run OCR with Azure Cognitive Services, enrich metadata, then bulk-index millions of PDF pages.
• Added PDF pre-processing (flatten, rotate) and developed a React/Next.js viewer on pdf.js with highlight positioning and deep-link sharing; first-page pre-render + parallel rendering.
• Tags caching for recent searches.
• Categories for better organization.

- Full-stack / AI-powered Chat Platform (Sensei) ‑ Node.js, TypeScript, Next.js, Azure.

• Developed a scalable AI-powered chat system with semantic and hybrid search.
• Integrated Azure OpenAI chat for real-time responses using Next.js with SSE protocol.
• Created custom prompts for specialized SME guidance per chat mode.
• Implemented hybrid search with semantic reranking (Azure Search).
• Designed contextual document retrieval mechanisms with semantics, chat thread and user. + Vector search handles semantics, while Azure’s semantic-keyword layer corrects typos and boosts recall; the hybrid approach raised answer accuracy by 40%. + User- and thread-level filters: enforce multi-tenant data isolation (GDPR-compliant), preserve conversation context by retrieving only documents the same user has uploaded or referenced in the current thread.
• Streaming ChatCompletion service in Next.js API routes; Server-Sent Events push token-level responses to client.
• Created an entry point chat-type dispatcher (normal, chat with file, multimodal, Bing, SME…)
• Secured configuration using Azure Key Vault and Environment Variables.

Technologies used: • Node.js + TypeScript, Azure Cognitive Search (semantic & vector), OpenAI embeddings, SSE streaming.

EDUBAO | EDUBAO.ORG

Software Engineer

As the first developer of Edubao Viet Nam, I was in charge of setting up and building edubao.org and its ecosystem to introduce our insurance packages for students/workers aiming to study/work in Germany. Key contributions include:

• Built edubao.org, a study & insurance portal for students in Germany.
• Developed a dynamic blog system with Squidex.io CMS, SEO support, and user-friendly interfaces for marketing/business teams.
• Integrated Google Tag Manager to track user behavior, increasing conversion rates.
• Led the migration from Azure to AWS (Lightsail, EC2, S3, Cloudfront).

Tech stack: ReactJS, Gatsby, Next.js, GraphQL, Elasticsearch, AWS, Azure DevOps.

8BIT ROCKSTARS | NFQ.ASIA

Web Developer

- Core developer for Heidelpay, a German payment gateway.

• Designed a dynamic financial dashboard with Chart.js, tracking revenue in real-time.
• Set up the frontend's foundation utilizing ReactJS.
• Implemented dynamic dashboard/widgets with Chart.js.
• Tracked revenue via transaction type/grouped as orders.
• Implemented dynamic filtering via query string.
• Learned PHP and techniques to build a worker handling ~200 transactions per second by breaking down into smaller states from the workflow.

Technologies used:
- PHP (Symfony 3), MySQL 5.7, ReactJS (old lifecycle, not hooks)
- Git/GitHub (Pull Request flow), PostgreSQL, Mongo, RethinkDB, Redis, RabbitMQ.

TRIPOLIS SOLUTIONS

Fullstack Developer

Developed a Drag and drop campaign management system (Email marketing).

• Maintained the frontend using AngularJS to build access portal, handle authentication/authorization, and redirect to main web-based applications.
• Learned React.js (2015) and built component-based architecture to speed up complex drag & drop nodes for marketing campaign creation.
• Migrated AngularJS code to ReactJS incrementally.
• Used Ruby to build an individual authentication service (middleware).
• Utilized Go to handle heavy tasks supporting high concurrency as internal services.

Technologies used:
- PHP (Symfony 3), MySQL 5.7, ReactJS (old lifecycle, not hooks)
- Git/GitHub (Pull Request flow), PostgreSQL, Mongo, RethinkDB, Redis, RabbitMQ.

LUDIINO CO., LTD

Front-end Developer

- Developed Golfconnect24, a cloud-based golf management platform.

• Built a real-time booking & e-scorecard system using AngularJS.

Eztek Software Development Co., Ltd

Internship

Project: Car Finding E-Commerce System (April – June 2014)