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Software Architect · Taipei, Taiwan

I specialize in enterprise application architecture — designing systems that are modular, maintainable, and built to scale. My focus is on applying N-Tier + Clean Architecture + MVVM patterns to real-world ERP and business information systems.

A modular .NET framework for building definition-driven business applications — the successor of Bee.NET.

• Single source of truth — FormSchema drives UI layout, database schema, and validation simultaneously
• Hybrid architecture — N-Tier + Clean Architecture + MVVM, tuned for ERP transactional flows
• Any client, one API — Avalonia (desktop, browser, iOS, Android), Blazor Server, and JavaScript clients talk to the server over JSON-RPC 2.0
• Multi-database — SQL Server, PostgreSQL, MySQL, Oracle, and SQLite
• Conventions enforced at build time — Roslyn analyzers ship with the packages and turn framework rules into build diagnostics

See it in action: Polhem.Northwind — the classic Northwind case built almost entirely from definitions, running on desktop, browser, iOS, and Android.

• Polhem.JsonRpc — JSON-RPC 2.0 for .NET on System.Text.Json: server, ASP.NET Core endpoint, and client
• Polhem.OAuth2 — lightweight OAuth2 sign-in for .NET (Google, Facebook, LINE, Microsoft Entra ID, Auth0, Okta)
• polhem-connector-js — JavaScript / TypeScript connector for the Polhem JSON-RPC API

Architecture Patterns: N-Tier · Clean Architecture · MVVM · Definition-Driven Architecture
Domain: Enterprise Information Systems · ERP · Business Object Design

I share hands-on architecture experience and implementation notes on HackMD:

👉 hackmd.io/@jeff377

Topics include .NET architecture design, enterprise system patterns, and Polhem framework deep dives.