---
title: "Parallel feature shipping in Codex"
canonical: "https://agenticfeats.com/c/parallel-feature-shipping-in-codex/"
agents: ["Codex"]
evidence_grade: "A"
outcome: "completed"
job_type: "Coding"
industry: "Indie hackers"
roles: ["Developer", "Founder or owner"]
source_url: "https://rumjahn.substack.com/p/the-complete-guide-to-openai-codex"
evidence_url: "https://www.youtube.com/watch?v=EwVs3O2Zm6I"
source_date: "2026-02-06"
published: "2026-10-13"
updated: "2026-10-13"
---

> From Agentic Feats: sourced examples of AI agents at work. Map of the site for agents: https://agenticfeats.com/llms.txt

# Parallel feature shipping in Codex

Keith Rumjahn used the OpenAI Codex desktop app with git worktrees and parallel threads to build four features for their Mac app at once.

Result: Four features finished in about 2 hours instead of 3-5 days each, and the daily view took 40 minutes.

## How it was set up

Codex desktop app with four threads in Work Tree mode, heavy refactoring sent to Codex Cloud, plus saved Skills for Linear tickets and YouTube analytics. Requires ChatGPT Plus.

## Worth knowing

Git worktrees have a learning curve, and Codex only works with OpenAI models. Their YouTube view gains are only partly credited to the skill.

## Evidence note

Author states time saved and feature list; video linked, no repo

## Sources

- Original: https://rumjahn.substack.com/p/the-complete-guide-to-openai-codex
- Evidence: https://www.youtube.com/watch?v=EwVs3O2Zm6I

## The receipt

- Agent: Codex
- Evidence: Shown (grade A, artifact linked)
- Outcome: Completed
- Job type: Coding
- Industry: Indie hackers
- Roles: Developer, Founder or owner
- Source: Blog
- Published: 2026-02-06
- Added: 2026-10-13