Building an LLM-Powered Code Review Sidebar
How I built Sherpa, a Chrome extension that uses LLMs to explain pull requests as you review them, with progressive file and hunk-level detail.
Mark Phelps' Blog
Writing about Go, Rust, AI, developer tools, whatever.
Latest posts
Running AI Agents in Devcontainers
How to use devcontainers to run AI agents like Claude Code and Codex in isolated environments you control, so you can skip the permission prompts.
Dependency Injection Explained
An explanation of Dependency Injection in Go and why it's useful.
Trying Out Generics in Go
Converting a library that used code generation to generics in Go 1.18
Switching My gRPC Project to Use Buf
My experience switched my gRPC backed project's protofiles to use Buf
4 Things to Consider When Choosing a Go API Framework
Four things to think about when choosing an API framework to write your next Go service.
Writing Tests for Your Database Code in Go
How To Write Tests for Your Database Code in Go Without Mocking SQL
Reading 26 Books a Year
Setting a personal goal to read 26 books in a year with a system for retention using notes and summaries.
Handling Errors in Your HTTP Handlers
A pattern for returning errors from Go HTTP handlers to reduce boilerplate and centralize error handling.
Profiling to Reduce Memory Allocations
Using pprof and go tool trace to find and fix a 100x memory allocation issue caused by compression middleware.
Speed Up Your Go Builds With Actions Cache
How to configure GitHub Actions caching for Go modules and build cache to speed up your CI pipelines.
Migrating From Travis to GitHub Actions
A walkthrough of migrating a Go project's CI/CD pipeline from Travis CI to GitHub Actions with matrix builds, services, and releases.
How to Take Three Years to Finish Your Side Project
Lessons learned from spending three years building Flipt, including mistakes to avoid and launching before you feel ready.
Testing API Clients in Go
4 Tips for Testing Your API Client
Option Types with go generate
Creating Option types in Go without generics using go generate, templates, and golden file testing.
Functions as State
Using recursive function types to implement elegant state machines in Go, inspired by Rob Pike's lexical scanning talk.
Writing a Ray Tracer in Go - Part 5
Final part: adding glass materials with refraction, a movable camera, field of view, and runtime configuration with Go flags.
Writing a Ray Tracer in Go - Part 4
Introducing materials with Lambertian diffuse reflection and specular metal surfaces with fuzz coefficients.
Writing A Ray Tracer in Go - Part 3
Adding shading with surface normals, implementing anti-aliasing with sampling, and refactoring with Go interfaces.
Writing A Ray Tracer in Go - Part 2
Implementing rays, spheres, and ray-sphere intersection to render a red sphere on screen.