Hi, I'm ChengYu(诚宇) — a senior full-stack software engineer with 7+ years shipping production web and mobile applications for international clients. I love building clean, scalable, and meaningful digital experiences that solve real problems, including AI features built on LLMs and Retrieval-Augmented Generation.
With a strong foundation in Android and iOS, I'm constantly learning and experimenting to sharpen my craft — diving deep into Backend Development, Databases, LLMs, and Gen-AI frameworks. Day to day, that means building web & mobile apps, exploring LLMs and Gen-AI, optimizing databases, and creating AI-powered solutions.
That curiosity started in the classroom. I earned my Bachelor of Science in Computer Science from Shenyang City University in Shenyang, China (graduated 01/2020), with coursework in Data Structures & Algorithms, Operating Systems, Databases, Computer Networks, Software Engineering, and Machine Learning — the same foundations I still draw on when I ship production software today.
Frontend development
Frontend development
Backend development & APIs
Backend development & APIs
iOS & macOS => XCode
Android => Android Studio
Android & Cross Platform
Android development
Android development
Database Management
Database Management
Database Management
Database Management
Base Script Language
Extension Script language
Robot Operating System
From point cloud
PyTorch, TensoFlow
Retrieval-Augmented Generation
Autonomous agents & workflows
Conversational AI assistants
A retrieval-augmented generation app with chat, user dashboard, and profile management for grounded AI answers from private knowledge.
An AI agent platform for web and mobile that plans tasks, calls tools, and automates multi-step workflows end to end.
A configurable conversational chatbot with AI model settings, general preferences, and an in-context answer overlay experience.
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A cross-platform gacha-style mobile experience with rich visuals and animated reveals.
A multi-portal food platform with customer landing, partner dashboard, and admin management areas.
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A native cross-platform tablet application delivered for both iOS (iPad) and Android, with a shared design across platforms.
A web-based selfie video recording app with guided capture flow, thank-you screen, and an admin review panel.
A compliance-focused web platform with a user-facing site and an internal admin dashboard for monitoring and management.
Implemented the 3D object Dectection using pointpillars and integrated it with ROS2.
Improved the object detection using KITTI Model with KITTI dataset.
Muselink is a comprehensive platform designed to facilitate seamless collaboration within the music industry. It empowers artists to categorize themselves based on their roles such as vocalist, guitarist, instrumentalist, lyricist, and more.
Perfect pixel web design project for a modern tech startup.
This is a user-friendly iOS application developed using Swift and SwiftUI.
This is a full-stack web application built using the MERN stack (MongoDB, Express.js, React.js, Node.js).
The restaurant directory listing app allows users to search for various restaurants based on their location and specific filters. The app is available on both iOS and Android mobile devices.
Collection of some of the websites that I have designed for my clients
- Choose from a wide range of delicious meals
- Order from your favorite stores or vendors
- Enjoy instant delivery and payment
- List Of Garments
- Add items to cart
- Place order
- Track your pickup & Delivery
- GPS / Google Map Tracking
- Invoice Generation
- Push Notification
This is a modern and responsive website design project created using Figma. The design focuses on clean aesthetics and user-friendly navigation.
-DVSS (Driven Vehicle Sharing System) simplifies vehicle transactions.
-Share, rent, buy, or sell vehicles effortlessly with a user-friendly app.
-A disruptive approach to traditional vehicle transactions for added
convenience.
-No more credit checks, hidden fees, or complications with DRIVES.
-Our vehicle inventory ensures reliability and easy rentals at affordable rates.
This is a full-stack web application built using the MERN stack (MongoDB, Express.js, React.js, Node.js).
I'm always open to discussing new projects, creative ideas, or opportunities to be part of your visions. Feel free to reach out!