AI agents and MCP servers LinkedIn GitHub @expertvagabond

An idea is just the beginning.

I’m Matthew—a creative technologist working across AI, film, and digital experiences. I build the tools, shape the story, and bring people together to make it happen.

See the Work Start a Project

01 — In the studio

  • Matthew Karsten seated in a wooden chair in the studio, with a guitar and a side table, wide shot.
  • Matthew Karsten seated in the studio, full-length, hands folded.
  • Matthew Karsten in an olive jacket, smiling, in the warm studio light.
  • Close studio portrait of Matthew Karsten, three-quarter angle, smiling.
  • Matthew Karsten in profile, seated in the studio chair.
  • Matthew Karsten seated and turned toward the camera, thoughtful expression.

Where the Work Happened:

  • Chime
  • ZetaChain
  • LBank Exchange
  • IBM Cloud Video
  • EthCC
  • ETHDenver
  • Superteam
  • Colosseum
  • Nickelodeon
  • Norwegian Cruise Line
  • Carnival Cruise Line house flag

I build the AI, and I can show
it moving revenue.

Matthew Karsten ships AI agents and developer tools,
then sells them to the people who need them.

  • Ship AI agents, MCP servers
    and inference     to production.

  • Price, pitch and close
    technical deals    .

  • Grow developer
    communities     that stick.

$50M+ in listing sales on a five-person team. 10,000+ active developers grown. 15+ production MCP servers. Every number here has a source.

The receipts are on the work page. See the work →

MeetMatthew

I’m happiest when there’s something to figure out, and something to make.

My career has taken me through engineering, commercial campaigns, developer communities, and partnerships. I can get into the technical details, step in front of a camera, or help a room full of people understand an unfamiliar idea.

My work spans AI tools, developer communities, video production, and business development. I’ve helped grow a community to more than 10,000 active developers and worked on a team that closed over $50 million in listing sales. I’m comfortable building the product, presenting it on camera, and starting the conversation that becomes a partnership.

I learn by making things. Building a tool shows what the technology can do. Making a video shows what makes a story work. Sharing both opens the door to the next collaboration.

$50M+Sales closed
10,000+Developers grown
15+Production MCP servers
4×Hackathon winner
The Long Version
Matthew Karsten in a forest-green cap, holding the brim.

02 — Four caps, one guy

  • Matthew Karsten in a forest-green cap, holding the brim.
  • Matthew Karsten in an olive cap and olive tee, smiling.
  • Matthew Karsten in a rust corduroy cap and cream ringer tee, smiling.
  • Matthew Karsten in a stone-beige cap and sweatshirt, holding the brim.

03 — On camera: the face of a brand

Three years of recurring work with Chime across television commercials, social content, and member stories. My role: featured talent, bringing personal experience to the brand’s campaigns.

Building credit

Sharing my experience with building credit in Chime’s 2023 member campaign.

04 — On stage

Solana Embassy

Presenting an idea to the Solana community, recorded at the Solana Embassy.

05 — Helping people get started

Make the first build easier

Guides, SDK tooling, and reference projects that help developers move from reading about a platform to using it.

Give people something to explore

Working demos and starter kits for Next.js, React, Solidity and Move, covering cross-chain NFTs, swaps, staking and games.

Create reasons to come together

Hackathons, AMAs, live workshops, sprint-based team activations, and developer programs with partners including Google Cloud.

The SINT Labs website.

AI Agents & MCP

MCP servers that let AI models act on real systems: wallets, CLIs, enterprise APIs. Published under my own name on npm and crates.io.

See the Lab of AI projects
The Coldstar website.

Secure Systems

Coldstar turns any USB drive into an air-gapped signing device. A Rust signer and a zero-knowledge layer I built from scratch.

About Coldstar

Published on Amazon:

  • The Crypto Survival Guide, by Matthew Karsten
  • Superteams: And How to Build Them, by Matthew Karsten
  • Accelerate Solana Consensus, by Matthew Karsten

Three books on crypto, team-building and the engineering behind one of the fastest blockchains. More about the books

Let’s Build

Tell me what you’re building, what’s stuck, and when you need it. Every message comes straight to me, and I reply personally.

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