NGUYỄN HỒNG QUÂN

MODEC | DNA

Senior Software Engineer

- Revamped a 2-year-old internal search engine, improving document retrieval speed by 30%.

• Fetching file changes from data hub by listening changes via API.
• Number of workers are extensible via /healthcheck API and Azure Monitoring tools.
• Doing OCR using Azure Cognitive service to define additional metadata/properties.
• Flatten/Rotate PDF files/images for better experience.
• Built a web application for viewing PDF files (using pdf.js) with highlight positioning.
• Shared search query/results via hyperlink among team/project members.
• Optimized rendering phase by pre-building the first page as image, rendering in parallel, pagination support, tags caching, and categories creation.

- Developing Sensei, an AI-powered assistant using GPT-4(o) & Retrieval-Augmented Generation (RAG), enhancing response accuracy by 40%.

• Engineered a robust and scalable AI-powered chat system utilizing OpenAI’s Chat Completion APIs and Azure AI Search.
• Implemented semantic and hybrid search capabilities for accurate responses.
• OpenAI chat integration with real-time streaming of chat responses using Next.js framework.
• Custom prompt engineering for specialized system and SME guides.
• Contextual Document Retrieval with Cosmos DB.
• Chat history management, limiting up to 30 messages with file content as part of the query.
• User identification and privacy through hashed IDs (userHashedId).
• API development with OpenAIStream function for efficient data flow.
• Secure/scalable configuration via Azure Key Vault and Environment Variables.
• Scalable Architecture Design by modularizing services for each mode.

Technologies used:
- TypeScript, Next.js
- Azure Cognitive Search, Cosmos DB, Azure OpenAI
- Langchain, Langfuse (self-hosted)

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)