Marc KelechavaUPDATED 2026-10-27

Marc Kelechava

I’m an AI engineer with a data science background. I build most of my software with coding agents now, and I write my own tools for running them and checking their work.

In 2025 and 2026 I was a founding engineer at Skyvern, where I built the MCP and CLI that coding agents use to drive a browser and shipped self-serve billing end to end. Before that I did ranking, experiments and data work at Punchup, Faire and O’Reilly, and spent five years at Facebook. I make music as Muon and co-founded Excise Records.

Start here

2026 · in progress

Cosine Club Digger

Cosine Club Digger in a browser: a player across the top, a trail of four steps on the left, step 4 listing tracks that sound like the label Ilian Tape in the middle, and a small map of the step on the right.
A dig that started from two Skee Mask tracks. Step 4 follows the label of a pick in step 1, Ilian Tape.

A music-discovery app I’ve been building since January. I start from tracks I love and follow what they sound like, one step at a time, through their labels, artists and credits. Every pick says why it’s there, and no language model runs anywhere in it.

How it works · All projects

How I build

2026 · open source

Lane

Lets my main coding agent hand tasks to Codex and Claude Code workers and keep working while they run. A worker’s result counts only when my own acceptance test passes in its checkout and the files it was told not to touch are unchanged.

How it works · Source on GitHub

More projects

  • 2026 · in progress
    Sunset Bound

    A 2.5D adventure game about two pets crossing San Francisco, built in Unity with art modeled in Blender.

  • 2026
    brickforge

    Turns a description and a few photos into a LEGO model I can order and build, with every step checked before any parts are bought.

  • 2026 · open source
    heavylane

    A command-line tool that runs my coding agents’ heavy jobs on a spare Mac over SSH, one at a time, and brings the results back.

Work

  • 2025 to 2026
    Skyvern · founding engineer
  • 2024 to 2025
    Punchup · full stack engineer
  • 2021 to 2024
    Faire · senior ML engineer, earlier senior analytics engineer and data scientist
  • 2019 to 2021
    O’Reilly Media · data scientist
  • 2012 to 2018
    Facebook · client partner and analyst

Earlier: American Express and the Broad Institute. B.A. in Mathematics, Boston University.

What I did at each

Music

  • 2024
    Genos · digital EP
  • 2016
    Broken Dreams · 12-inch vinyl

All releases