Hi, I'm Yinjian

Ottawa, ON, Canada

I'm a freelance Full-Stack Developer specializing in AI web applications and iOS apps. With over 7 years of industry experience, I build clean, user-friendly software solutions tailored to your vision.

Ready to start your project? Get in touch today!

Yinjian Chen - Full Stack Software Engineer

Featured Projects

Here are some of my recent projects that showcase my skills and experience

Audibit - Audibit gathers the latest and hottest tech news and turns them into podcast-style audio

Audibit

Audibit gathers the latest and hottest tech news and turns them into podcast-style audio

Next.jsSwfitUIOpenAITTSRAG
Language Translation Platform - An internal platform in Xmind Company

Language Translation Platform

An internal platform in Xmind Company

Next.jsRAGAWS
Shanjian - Shanjian is a video generation platform based on text, pictures, and video clips to generate digital avatar videos.

Shanjian

Shanjian is a video generation platform based on text, pictures, and video clips to generate digital avatar videos.

Node.jsRabbitMQRedis
Video Rendering Service - Video Rendering Service is an internal backend core service that supports all the company's video generation products.

Video Rendering Service

Video Rendering Service is an internal backend core service that supports all the company's video generation products.

Node.jsGoRabbitMQMicroservices
Doupai - Doupai is a video editing tool that helps users create engaging videos and quickly share them on social media.

Doupai

Doupai is a video editing tool that helps users create engaging videos and quickly share them on social media.

Objective-CUIKit
Youpai - Youpai is a game live-streaming and video-sharing platform under 4399.

Youpai

Youpai is a game live-streaming and video-sharing platform under 4399.

Objective-CUIKit

Latest Blog Posts

Hackathon Journey - I Vibe Coded a Vibe Landing Page Generator

Hackathon Journey - I Vibe Coded a Vibe Landing Page Generator

Vibe CodingGen AIHackathon

Work Experience

My professional journey and key achievements

Shenzhen Aisi Software Technology Co., Ltd. (Xmind) logo

Backend Engineer

Apr 2023 - Jul 2024

Shenzhen Aisi Software Technology Co., Ltd. (Xmind)

Shenzhen, China

  • Built a translation platform solely using LLM, Next.js, AWS, cutting external translation costs by CAD 20k/year.

  • Achieved 90% human translation quality (French, German) via RAG-based improvements, validated by in-house language experts.

  • Optimized user/payment services (Python, Node.js) features and collaborating across teams.

LLMNext.jsAWSPythonNode.js
Shenzhen Qutui Science & Technology Co., Ltd. (Shanjian) logo

Backend Development Engineer

Jun 2021 - Aug 2022

Shenzhen Qutui Science & Technology Co., Ltd. (Shanjian)

Shenzhen, China

  • Led 1 engineer to develop a cloud video rendering service (Node.js, Go, RabbitMQ) and coordinated with 5 teams (11 members) to support for more than 4 products integration.

  • Authored a technical guide that improved cross-team collaboration; received top monthly performance rating (1st of 14).

  • Migrated a rendering engine from a single machine to scalable GPU servers, boosting rendering speed by 3× and simplifying deployment.

  • Optimized rendering tasks scheduled within cron jobs by designing a Redis-based caching strategy, reducing rendering costs by 50%.

  • Delivered REST and WebSocket APIs for a text-to-video generation product, collaborating with 3 teams on integration and testing to enable seamless mobile and front-end functionality.

Node.jsGoRabbitMQRedisREST APIWebSocket
Shenzhen Qutui Science & Technology Co., Ltd. (Shanjian) logo

iOS Development Engineer

Mar 2019 - May 2021

Shenzhen Qutui Science & Technology Co., Ltd. (Shanjian)

Shenzhen, China

  • Led 3 iOS developers to deliver major version updates, integrating video rendering engine new features.

  • Developed an iOS module registration library to support modular architectures across multiple projects.

iOSSwiftObjective-C
4399 Network Co., Ltd. logo

iOS Development Engineer

Jul 2017 - Jan 2019

4399 Network Co., Ltd.

Xiamen, China

  • Drove evaluation and adoption of a new iOS tech stack (RxSwift, MVVM, modularization) by developing libraries and documentation that enabled team integration in new projects.

  • Collaborated with other members to develop a gaming video app and children vidoe app.

iOSRxSwiftMVVM
4399 Network Co., Ltd. logo

iOS Development Intern

Feb 2017 - Jun 2017

4399 Network Co., Ltd.

Xiamen, China

  • Supported iOS team in a video streaming app feature development, bug fixes, and testing.

iOS

Skills & Technologies

My technical expertise across different domains

Language

TypescriptJavascriptPythonGoSwiftObjective-C

Backend

Node.jsPostgres (Supabase)RedisMongoDBMySQLFirestoreRabbitMQWebsocketExpress.jsNest.js

Frontend

React.jsNext.jsTailwind CSSCharkra UIHTMLCSS

AI

OpenAI APIRAGLangChain/LangGraph/LangSmithPineconeQdrantMachine Learning (Supervised)

Mobile

SwiftUIReact NativeSwiftIonicObjective-CUIKitMVVM

DevOps

DockerAWSGithub ActionsGitlab CI/CDVercelNetlify

Tools

CursorV0LinuxFigmaffmpeg

Education

Carleton University logo
Master of Engineering - Software Engineering Practice

Carleton University

Canada

2024.9 - 2026.5

Fujian Agriculture and Forestry University logo
Bachelor of Engineering - Electronic & Information Engineering

Fujian Agriculture and Forestry University

China

2013 - 2017