There is an idea that is not obvious until you hear about it for the first time: as interfaces are types themselves, they too can have type parameters. This idea proves to be surprisingly powerful when it comes to expressing constraints on generic functions and types. In this post, we’ll demonstrate it, by discussing the use of interfaces with type parameters in a couple of common scenarios.

Terminal-based group chat app with real-time WebSocket messaging, file sharing, themes, and admin tools — built with Go and Bubble Tea.

Having used rate limiters a few times, I’ve observed that they must be thoughtfully designed. In particular, they are typically comprised of several policies which we wish to stack on one another. It can get messy.

So I decided to design a rate limiter that emphasizes composability, which I define as having the right primitives, where one can express arbitrary policies, and which can be combined in a way that is easy to reason about.

BillionMail is a future open-source Mail server, Email marketing platform designed to help businesses and individuals manage their email campaigns with ease. Whether you're sending newsletters, promotional emails, or transactional messages, this tool will provide full control over your email marketing efforts. With features like advanced analytics, and customer management, you'll be able to create, send, and track emails like a pro.

The glamourous AI coding agent for your favourite terminal

A lightweight language model chat service accessible through HTTP, SSH, DNS, and API. One binary, no JavaScript, no tracking.

# Web (no JavaScript)
open https://ch.at

# Terminal
curl ch.at/?q=hello             # Streams response with curl's default buffering
curl -N ch.at/?q=hello          # Streams response without buffering (smoother)
curl ch.at/what-is-rust         # Path-based (cleaner URLs, hyphens become spaces)
ssh ch.at

# DNS tunneling
dig @ch.at "what-is-2+2" TXT

# API (OpenAI-compatible)
curl ch.at/v1/chat/completions

Multi-protocol service monitoring system with real-time alerts and web dashboard. Supports HTTP/HTTPS, TCP and gRPC monitoring with Telegram notifications.