---
title: "Marco Dong · AI product engineer"
description: "Marco Dong, AI product engineer in Milan. I build AI products end to end: Sidecar, Sage and AI Shell at Cela, and agents at Klarna and Moneyfarm."
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> Index of every page on this site: [llms.txt](https://madong.me/llms.txt)

# I build AI products end to end. The agents write a lot of the code, and the standard is mine.

Software engineer at Klarna, AI product engineer at Moneyfarm, and founder of Cela, where I'm building Sidecar, Sage and AI Shell.

See the work [Read the CV](https://madong.me/cv)

Agents do the work.

Every step, up to the click you can't take back.

That click stays yours.

Three products, one rule.

## Sidecar

Sidecar sits next to Claude Code. You review what it changed, line by line, and when you comment on a page it built, the comment lands back in the conversation.

[See Sidecar](https://madong.me/sidecar)

## Sage

A Mac assistant in the notch. Hold a key, say what you want in English, Italian or Chinese, and it does the steps, asking before anything it can't undo.

[See Sage](https://madong.me/sage)

## AI Shell

Type `?` and say what you want. It writes the shell command, runs it when it only looks, and stops with a note before anything that deletes, overwrites or sends data off the machine.

[See AI Shell](https://madong.me/shell)

## One rule runs through all three.

A step that only looks runs by itself. A step that changes something waits for you. A step you can't take back stops at the line, and the click is yours.

Runs Waits for you Stops at the line

`↵`

A toy version that matches words. Sage and AI Shell ask a separate model to rate every step, never the one that wrote it.

## Work

One checkable number per line.

- 100M+ monthly active users ### Klarna

  Software engineer on the Klarna app.
- Since July 2026 ### Moneyfarm

  A customer-facing LLM agent inside a regulated wealth manager, and the evals that decide whether it's safe to release.
- 272 of 272 commits are mine ### LexSA

  An AI assistant for tax professionals that I built alone end to end, from retrieval and agents down to Cloudflare and the database.
- 200K+ conversations4.5 stars from 90+ ratings ### Intellectual.AI

  A custom GPT that strangers keep using. Once #16 in Education.
- 11.5% conversion ### Twilight

  A demand test before building anything: 979 visitors and 113 leads.
- 7 engagements ### Freelance

  Seven engagements since 2022, for two individuals, four SMEs and one corporate, each run from the first call to the invoice.

## How I work

Agents write a lot of my code. I wrote the rules they work under, I review what they ship, and nothing goes out under my name that I can't explain.

[Read the rules](https://madong.me/how)

- ticked #4 \[AI] Crossfade the sequence frames
- in progress #5 \[AI] Re-render the AI Shell film on fixed anchors
- pending #6 \[USER] Look at the sequence on a phone

## Contact

LinkedIn is the fastest way to reach me. Email works too.

- [LinkedIn linkedin.com/in/marcodong-838453](https://www.linkedin.com/in/marcodong-838453)
- [GitHub github.com/EthanITA](https://github.com/EthanITA)
- Email

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```

## Sitemap

See the full [sitemap](https://madong.me/sitemap.md) for all pages.