Nguyễn Xuân Vĩnh

Senior iOS Engineer & Applied AI

"Learning by doing."

Senior iOS Engineer with 10+ years building native mobile applications, currently focused on integrating production AI — LLMs, multimodal processing, on-device ML — directly into iOS apps.

Deep expertise in Swift, Objective-C, SwiftUI, and UIKit; working knowledge of Rust, Python, JavaScript, and TypeScript. Particular interest in NLP and multimodal data processing on mobile.

Experience

Senior iOS Engineer · Chợ Tốt

May 2022 – Present

Leading AI-driven mobile development for Vietnam's largest re-commerce platform.

Architected "Quét Là Bán" / AI Rapid Listing (Đăng nhanh bằng AI) — a multimodal feature combining real-time camera processing and on-device ML, serving millions of users
Integrated TensorFlow Lite for object detection and dynamic questionnaire generation
Built a real-time video pipeline that cut listing creation time by 70%

Mobile Engineer · VinHMS (Vingroup)

Sep 2019 – May 2022

Built MyVinpearl, serving 1M+ resort guests
Developed the CiTravel booking platform and CiOwner management system

iOS Developer · 2359 Media

Feb 2014 – Sep 2019

Singtel TV GO — streaming app for the 2018 FIFA World Cup (Singapore)
NewsLoop — curated news reader
Visit Singapore — official AR travel guide for the Singapore Tourism Board

Projects

VT Code

2025 – Present

CLI semantic coding agent, in Rust.

VT Chat

2024 – Present

Privacy-first AI chat app with RAG.

VT.ai

2024 – Present

Multimodal AI chat with dynamic conversation routing.

Clendar

2020 – Present

Minimal SwiftUI calendar — featured by Apple.

WriteDown

Markdown editor with cloud sync.

Humid

Voice-first weather app built on Combine.

Open Source Contributions

OpenAI Codex CLI

Merged pull requests improving OpenAI's open-source Codex CLI.

QwenCode CLI

Contributed improvements to QwenLM's Qwen Code CLI.

Writing

Lessons from Building VT Code: An Open-Source CLI AI Coding Agent

Rapid Listing — Building a Multimodal AI Application for iOS

Chợ Tốt Engineering Blog

Skills

Languages

Swift, Objective-C, Rust, Python, JavaScript, TypeScript, Ruby

iOS

UIKit, SwiftUI, Combine, Core Data, AVFoundation, Core ML, TensorFlow Lite

AI / ML

LLMs, multimodal processing, on-device ML, NLP, RAG, agentic workflows

Architecture

Clean Architecture, MVVM, Protocol-Oriented Programming, local-first design

Education

B.Eng., Information Technology · Tay Do University

2008 – 2012

Certifications

5-Day Gen AI Intensive

Kaggle & Google

2025

AI Agents Fundamentals

Hugging Face

2025

The Reasoning Course — Building AI Models That Reason

Hugging Face

2025

GitHub · HuggingFace · LinkedIn · Stack Overflow · Twitter · Hacker News