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Mix & Go

Mix & Go is Cezar Halmagean's studio: agentic engineering for Ruby on Rails teams, and YouTube programs that help devtools companies reach developers.

Their llms.txt

The beginning of the file, from our validated copy saved 2026-10-21T15:41:16.446Z. Cached copy · Source on mixandgo.com

# Mix & Go

> Mix & Go is Cezar Halmagean's studio: agentic engineering for Ruby on Rails teams, and YouTube programs that help devtools companies reach developers.

## Overview

Mix & Go offers two services. Cezar Halmagean has spent 18 years building software (tech lead at RepairPal, scaled to 3M+ monthly users), has trained 160+ Rails developers, speaks at Rails Global Summit and RubyConf, and has taught developers through the Mix & Go YouTube channel for over a decade.

## Services

### Agentic Engineering for Rails Teams (https://mixandgo.com)

For CTOs and founders of Ruby on Rails teams who already use AI but aren't seeing the roadmap move faster. Cezar sets up fleets of AI coding agents in the team's codebase: several agents working in parallel, each with one clear job and the team's conventions, with tests and review on every change, and the team's engineers steering. Ruby on Rails is his home stack, with production experience going back to 2008.

- Starts with a one-week build sprint: $5,000 fixed price. An agent setup for the repo, one real feature shipped fully tested and ready to merge in 5 business days, a walkthrough call with the team, and 30 days of email support. Full refund if the client isn't happy with it.
- Then One Big Project: from $20,000, fixed price. The project that's been stuck on the roadmap (a Rails upgrade, a legacy rewrite, a big feature nobody wants to start), shipped with the fleet, scoped and priced up front.
- Or Head of AI Engineering: from $15,000/mo, part-time, month to month. Cezar leads the team's AI engineering, ships work through the fleet alongside the engineers, and reviews the PRs.
- Also available: an independent second opinion on the codebase and the team's agent workflow, $3,500, with a report within 5 business days.

### YouTube for Devtools and APIs (https://mixandgo.com/youtube)

For devtool and API companies whose buyers are developers. Mix & Go builds YouTube videos that answer the exact searches developers make, so the company shows up before they have shortlisted anyone. An engineer builds and records the real thing first, and nobody on the client's team goes on camera. The channel, videos, and code belong to the client.

- Pilot: $2,000, fully refundable within 7 days, credited toward the first month
- Program: $6,000/month for four videos, with topic research, production, publishing and SEO, docs placement, tracked attribution to signups, and library upkeep
- Full pricing: https://mixandgo.com/youtube/pricing

## Main Sections

### Pricing
https://mixandgo.com/youtube/pricing - A $2,000 pilot, fully refundable, then $6,000/month for four YouTube videos. Here's exactly what that buys and how it compares to a DevRel hire or a written-content agency.

### Guides
https://mixandgo.com/guides/devtool-video-agencies - A fair comparison of Videodeck, Draft.dev, Infrasity, Plug.dev, and Mix & Go for devtool companies deciding how to invest in video and YouTube content.
https://mixandgo.com/guides/
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