Xiaohu Zeng

Senior Full Stack Developer · Web & Mobile · Deployment & Operations

Open to: Full Stack Development · Technical Lead Roles · Independent Project Collaboration

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Summary

Full stack developer with over 20 years of software development and platform operations experience. Independently deliver products across requirements, architecture, frontend, backend, databases, deployment, and ongoing maintenance. Experience includes digital card trading, e-commerce, archive management, and Web/mobile applications, with responsibility for both technical delivery and day-to-day business operations. Current work centers on InSyncCircle, a family app for Web, iOS, and Android.

Technical Skills

  • Frontend & Mobile: TypeScript, React, Vite, Capacitor; Web, iOS, and Android applications with Chinese and English interfaces.
  • Backend & Data: NestJS, Prisma, PostgreSQL, Redis; API design, data modeling, permissions, data isolation, transactions, and idempotency.
  • Business Integrations: Subscription and payment systems, RevenueCat in-app purchases, AI services, speech recognition, and speech synthesis.
  • Delivery & Operations: Service deployment, app releases and updates, logging and troubleshooting, administration tools, and product operations.
  • Additional Experience: C#/.NET, ASP.NET Web API & MVC, MSSQL, AngularJS, Microsoft Access, OCR, and image processing.

Professional Experience

Senior Full Stack Developer (Independent)

2015 - Present

InSyncCircle: Family Collaboration & Child Development App

A family app covering tasks and rewards, schedules, elder care, household finances, and shared memories.

Website: InSyncCircle.app

Tech Stack: TypeScript, React, Vite, Capacitor, NestJS, Prisma, PostgreSQL, Redis, RevenueCat.

  • Designed the product, frontend and backend architecture, database schema, administration console, and website; continue to develop and maintain the application.
  • Built shared React and Capacitor clients for Web, iOS, and Android, with Chinese and English interfaces.
  • Implemented task assignment, completion review, points, and reward redemption, plus allowance, family schedules, care reminders, and shared memories.
  • Implemented family member permissions and data isolation, idempotent payment processing, RevenueCat in-app purchases, and subscription entitlement synchronization.
  • Integrated AI parenting assistance, speech recognition, and speech synthesis into family workflows.
  • Handle separate China and global service deployments, app version updates, and administration dashboards for usage analytics and marketing attribution.

Art Archives App (2015)

Designed and developed a mobile application for browsing and managing digital art archives.

Tech Stack: AngularJS (Frontend) + ASP.NET Web API (Backend).

  • Implemented the client interface and backend services, including the integration between the mobile application and its APIs.

Software Engineer

2014 - 2015

Intelligent Archives Management System

Tech Stack: .NET C# (Desktop) + Microsoft Access.

  • Developed a C# desktop application with OCR, image processing, and a local database.
  • Applied text recognition and image processing to paper archive digitization, reducing repetitive data entry and supporting document retrieval.

Founder & Full Stack Developer

2004 - 2014

Huxiao Game Network & Associated Platforms

Founded and operated gaming, digital card trading, and e-commerce platforms. Took responsibility for requirements, frontend and backend development, databases, server deployment, maintenance, and business operations.

  • Huxiao Platform (hx20.com) & Huxiao Game Network (hxccc.com): Built and maintained gaming community portals and handled platform operations.
  • Digital Card Platform (xidehu.com + Huanka.com + 11115.com): Fully developed, maintained, and operated digital payment, game card trading, automatic card delivery, points, and all-in-one card systems (the domain 11115.com was successfully sold).
  • Houao Mall (houao.com): Reused and extended the digital card platform codebase into a general e-commerce platform, then maintained and operated it.
  • Additional Tools: Created Game Download Stations and Remote AFK/Botting Management tools ("Huxiao Remote").
  • Developed stored procedure encryption and validation logic for handling sensitive game top-up card credentials.

Tech Stack: ASP.NET, server-side HTML generation, MSSQL, and stored procedures.

Server Administrator / Developer

Late 2002 - 2004

Legend of Mir 2 (Private Server)

  • Set up, customized, and operated a private game server, starting at age 17.
  • Managed server stability, database administration, and community operations.

Technical Learning & Practice

Halcyon (Web3 Learning Project)

A learning project (dev.halcyon.farm) for exploring Web3 development and its integration with a full stack application.

Technologies Practiced: React, Vite, NestJS, Prisma, Redis, Viem.

  • Practice API design, data modeling, and frontend/backend integration through the project.
  • Study blockchain interactions and application integration with Viem.

Cocos Creator Game Prototypes

Developed several mini-game prototypes with Cocos Creator to build practical game development experience. These remain internal prototypes and have not been publicly released.