Francis Sunday

Hi 👋🏾 I'm Francis, a software engineer with 6+ years of experience. In the past I've built financial systems, compliance workflows, monitoring tools, and developer tools. I primarily work with Go and Haskell, and I'm mostly interested in distributed systems, databases, and functional programming.

Feel free to read about myself, look at my posts, or book a chat with me.

Writing

Parsing, Not Guessing Jun 14, 2025

Using ASTs over regex to build a predictable, lightweight, theme-aware Markdown renderer in Go.
import "reflect" Jun 10, 2025

An attempt at a concise explanation of Go's reflection library.
Maps Don't Shrink in Go May 27, 2025

A note on how Go maps handle memory allocation and why they don't shrink automatically.
TTYs May 13, 2025

Learn about the `tty` command, which returns the current user's terminal name.
GADTs for Type-Level Domain Logic May 7, 2025

Using Generalized Algebraic Data Types (GADTs) in Haskell to encode domain-specific rules and state transitions.
Composable Parsers with Attoparsec May 6, 2025

Using Attoparsec in Haskell to create efficient and composable parsers for structured text data.