AI engineer · Revenue operator · Founder, Purple Squirrel Media LinkedIn GitHub @expertvagabond

About

The Purple Squirrel

Recruiters use “purple squirrel” for the candidate who can’t possibly exist: the engineer who can sell, the salesperson who can ship. I named my company after it, then spent years earning the name.

Matthew Karsten grinning, both hands on the brim of a green cap.

I build AI systems and developer tools, and I sell them. Most people pick one. I’ve done both for a living.

At ZetaChain, a $27M-funded platform backed by Jane Street, Vy Capital and Blockchain.com, I was one of three developer relations engineers. I owned events, documentation, developer tools, office hours, live streams and the Discord, and helped grow adoption to more than 10,000 active developers. I also built the platform’s MCP server, which made me the first engineer there to build with AI agents.

As Cross-Border Listing Manager at LBank Exchange I ran listings on a five-person team that closed more than $50M in listing sales: onboarding emerging ventures across the US–Latin America corridor, from first call to launch.

Through Purple Squirrel Media, which I founded in 2019, I ship the AI itself: MCP servers, agent tooling, a self-hosted inference layer, and websites for clients.

Matthew Karsten in front of a Welcome to Skyline mural in New York.

The Path Here

It didn’t start with code, and that’s why the sales half works.

  1. 2019–Present
    Founder & Lead Engineer, Purple Squirrel Media

    Production AI infrastructure, MCP and agent servers, and client websites. Before AI: a white-label real-time video backend scaled to 50,000+ concurrent users.

  2. 2025–2026
    Developer Relations Engineer, ZetaChain

    Starter kits, SDKs and reference apps across six networks; adoption grew to 10,000+ active developers. Spoke at EthCC 2025, ETH NYC and in San Francisco.

  3. 2024–2026
    Cross-Border Listing Manager, LBank Exchange

    A five-person team, $50M+ in listing sales across the US–Latin America corridor. Ran technical and commercial onboarding end to end.

  4. 2019–2020
    Flight Attendant, Allegiant Air

    FAA-certified cabin crew out of Punta Gorda, Florida, and Grand Rapids, Michigan. I grew up the youngest in an Air Force family, so aviation came naturally.

  5. 2015–2017
    Lead Entertainer, Carnival Cruise Line

    A trained performer, working at sea. Holding a room is a skill, and it carries over.

  6. Earlier
    Media & Streaming

    IBM Cloud Video (Ustream), supporting a $100M+ product line, plus media and entertainment work at WideOrbit and Nickelodeon.

Credentials

  • Claude Certified Architect – FoundationsAnthropic · 2026
  • Google AI CertificateCoursera · 2026
  • Web Application Development certificateHarvard Business School Online · 2024
  • Generative AI: Prompt Engineering & Foundation ModelsIBM · 2023
  • 27 IBM digital badgesCloud, Kubernetes, design thinking · 2021–2023
  • FAA Airman Certificate, Flight Attendant2019
  • Point Park UniversityPittsburgh
  • LanguagesEnglish (native) · Spanish (professional working)

Books

Three books, published on Amazon.

  • The Crypto Survival Guide, by Matthew Karsten The Crypto Survival GuideYour Essential Handbook for Navigating Cryptocurrency and Blockchain TechnologyAmazon
  • Superteams: And How to Build Them, by Matthew Karsten SuperteamsAnd How to Build ThemAmazon
  • Accelerate Solana Consensus, by Matthew Karsten Accelerate Solana ConsensusSix Years of Building the Fastest Chain on EarthAmazon

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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