Large-scale AI apps in production

PSA: the best Hacker News app for iOS is called "HACK"

No tracking, free and fast. What more do you need?

Feb 1 • Eliot Andres

January 2026

Attempting to rebuild Ramp's background agent system in a weekend (on a Mac VM)

Like many people, I was blown away by Ramp’s article on background agents. They use a setup where agents:

Jan 25 • Eliot Andres

1

Building Google-Docs-like live collaboration for a cross-platform app used by millions (in Rust)

Imagine yourself with 3 different clients (iOS, Android and web), each written in a different language, each already used by millions of users.

Jan 18 • Eliot Andres

1

Why you should change your mobile app version format to [year].[week].[iteration]

Why we did it and the downsides

Jan 11 • Eliot Andres

2

Our Setup for A/B Testing LLMs with Millions of Users

At Photoroom, we leverage LLMs under the hood of various features: prompt expansion, search, validation.

Jan 4 • Eliot Andres

1

December 2025

The best cable in the world (for developers)

After years of use, I thought I'd share

Dec 30, 2025 • Eliot Andres

March 2023

Building a 42-inch E Ink Art Frame

Recently, we wanted to find a way to display Generative AI art in our office at Photoroom.

Mar 11, 2023 • Eliot Andres