# Tzafrir Rehan

I build AI agents and the tools people use to work with them. I’m an AI Architect at Fiverr’s AI Innovations Lab, I make mods for Claude Code, and I release electronic music as DJ Zephyrus.

## Work

### AI Architect at Fiverr’s AI Innovations Lab

_Now_

I’m the architect of Mira, Fiverr’s AI headhunter, launched in Q3 2026. Mira turns a vague brief into a clear scope and a matched freelancer. On the [Q3 2026 earnings call](https://www.fool.com/earnings/call-transcripts/2026/10/30/fiverr-fvrr-q3-2026-earnings-call-transcript/), Fiverr’s CEO said orders through Mira have a median value five times larger than standard matches, with about a quarter fewer cancellations among first-time matches.

My paper [Test-Driven AI Agent Definition (TDAD)](https://arxiv.org/abs/2603.08806) treats agent prompts as compiled artifacts. You write behavioral specifications, a coding agent turns them into executable tests, and a second coding agent refines the prompt until the tests pass. The [code and benchmark](https://github.com/f-labs-io/tdad-paper-code) are open.

### CTO at [Be.Live](https://be.live)

_2016_

Co-founder and CTO since 2016. Be.Live is a live streaming studio that runs in the browser and sends one show to Facebook, YouTube, Amazon Live and more at once. Facebook named it a [Live Video Solutions Partner](https://blog.be.live/belive-tv-is-now-a-facebook-live-solutions-partner/) at its F8 conference in 2018, by which point shows made with it had drawn more than 300 million viewers. In 2021 NVIDIA featured it for running Maxine’s AI video effects in the cloud.

### Founding engineer at [Monday.com](https://monday.com)

_2013_

Joined Monday.com as a founding engineer.

## Projects

### [Claude Code Mods](https://tzafrir.net/mods.md)

_2026_

Three mods that change how Claude Code itself works: a pane for the tasks only you can do, a box that says what Claude is doing right now, and a pane that keeps Claude’s plan in view.

## Terminal tools

### [tmux-pane-mover](https://github.com/tzafrir/tmux-pane-mover)

_2026_

Drag and drop for tmux panes. Drag one pane onto another to swap them, or drop it on an edge to split there.

```sh
pip install tmux-pane-mover
```

### [tree-copy](https://github.com/tzafrir/tree-copy)

_2026_

A keyboard-driven file tree sidebar for tmux. Browse a project, copy paths and preview files without leaving the terminal.

```sh
pip install tree-copy
```

## Music

I release electronic music as DJ Zephyrus. More tracks and my DJ sets are on [SoundCloud](https://soundcloud.com/djzephyrus).

### [Refined Illusion](https://tzafrir.net/music/refined-illusion.md)

_2026_

Inspired by violin sounds.

[Listen on SoundCloud](https://soundcloud.com/djzephyrus/refined-illusion)

### [Moral Perfection](https://tzafrir.net/music/moral-perfection.md)

_2026_

Music by DJ Zephyrus, words by Benjamin Franklin.

[Listen on SoundCloud](https://soundcloud.com/djzephyrus/moral-perfection)

### [Underground Escapism](https://tzafrir.net/music/underground-escapism.md)

_2024_

With Ariel Pesikov.

[Listen on YouTube](https://www.youtube.com/watch?v=EAbth23dKww)

## Earlier

### Do Share

_2012–14_

A Chrome extension for writing and scheduling posts on Google+.

### More Chrome extensions

_2011–13_

- Personalize for Google Plus showed only the non-public posts in your stream.
- Nuke Comments on Google+ deleted a comment and blocked the commenter in two clicks.
- Invite cleanup for Google+ removed hangout invites from your profile.
- Page Shrinker made wide pages narrower.

## Elsewhere

- [GitHub](https://github.com/tzafrir)
- [SoundCloud](https://soundcloud.com/djzephyrus)