Hi, I'm Phil Chen (fahchen).

I’m a full-stack software engineer with a primary focus on Elixir and TypeScript, along with related frameworks and tools. I’m currently writing some Rust code too. I love building products and contributing to open source, and I actively contribute to the open source community.

Apr 6, 2026

Building Grephql: A Compile-time GraphQL Client for Elixir

How I built Grephql, a compile-time GraphQL client for Elixir that validates queries at compile time and generates typed responses.

Dec 12, 2025

Leveraging Elixir Compile Callbacks in EctoTypedSchema

A deep dive into how EctoTypedSchema uses @on_definition and @before_compile to automatically generate accurate typespecs for Ecto schemas

Dec 14, 2024

Handling messages in batch using GenServer

Handling messages in batches using Elixir’s GenServer optimizes processing efficiency and reduces overhead

Jul 5, 2024

Introduce TypedStructor

Introduce a new libary to define typed structs, exceptions and record macros with effortlessly.

Jul 2, 2024

Streaming data in Elixir

Discover how to efficiently stream data between file, database and even external systems.