Variant Systems

Blog

Thoughts on product engineering, building startups, and the craft of software development.

February 14, 2026

We Open-Sourced Our Code Audit as a Claude Code Plugin

A zero-dependency Claude Code plugin that runs 7 analyzers on any codebase — secrets, security, dependencies, structure, tests, and more.

claude-code code-audit open-source ai-tools

February 13, 2026

PhoenixPress: Compile-Time SEO for Phoenix Apps

We open-sourced PhoenixPress — sitemaps, robots.txt, and RSS feeds for Phoenix, generated at compile time with zero runtime overhead.

elixir phoenix seo open-source

February 12, 2026

Due Diligence for AI-Generated Codebases

How to evaluate AI-built and vibe-coded startups. What traditional due diligence misses and what your deal team needs to check.

vibe-coding due-diligence AI investors code-audit

February 10, 2026

Pre-Acquisition Code Review: A Buyer's Guide

What to check before buying a software company. A practical guide to pre-acquisition code review for M&A teams and CTOs.

M&A acquisition code-review due-diligence software

February 8, 2026

Technical Due Diligence for Software Acquisitions

Technical due diligence guide for software acquisitions. Architecture, security, AI-generated code, and what your deal team needs to know.

technical-due-diligence M&A code-audit acquisition software

February 5, 2026

How We Built a pSEO Engine with Claude

Our playbook for building hundreds of programmatic SEO pages without leaving Claude Code — research, strategy, and the gotchas nobody warns you about.

pseo claude-code seo ai-tools content-strategy

November 15, 2025

React Native Background Audio for AI

How we built hour-long session recording in React Native with expo-audio, direct S3 uploads, and an AI transcription pipeline.

react-native expo audio ai mobile

October 29, 2025

Building a Calendar in Phoenix LiveView

How we built a full-featured calendar in LiveView — data model, recurring appointments, multi-user views, drag-and-drop, and performance.

elixir phoenix liveview calendar

February 2, 2025

Dynamic App Icons in Expo

How we built an open-source package for switching app icons at runtime in Expo apps. Works on iOS and Android.

react-native expo mobile open-source

October 1, 2024

AI-Empowered, Not AI-Enabled

Our thesis on why the future belongs to engineers who use AI as leverage — not companies that use AI as a crutch.

thesis ai engineering