Hey, I'm Stefan.

Senior software engineer with 6+ years building products from early-stage startups to large companies. Ex founding engineer at Fabriq, core SDK developer at Polygon, founder of multiple products. Today I build AI systems. Cursor Ambassador.

The hardest part is never the code.

See the workGet in touch
2021Lazy minting
2022Optimistic L2s
2023Cross-chain intents
2025Agents, RAG, MCP

Selected work

Archie

Mock system design interviews with a live canvas that fills in as you talk.

The Archie app: chat sidebar with saved interview sessions beside the live interview canvas.

Read the case

Next.jsFastAPILangGraphCopilotKitReact Flow

Focus

What I build

AI systems
Agents, RAG, MCP, evaluation frameworks, and multi-agent orchestration.
Product
Full-stack apps, APIs, SDKs, and the developer tooling around them.
Foundations
Protocol SDKs, L2 systems, and cross-chain infrastructure at Polygon, Rarible, and Fabriq.

How I work

Three things that stay true

  • I work directly with founders, engineers, and users to understand and solve the hardest pain points.
  • I've shipped across engineering, DevRel, partnerships, and product roles.
  • I move between product thinking and hands-on implementation.

Let's build something.

I work across full-time, part-time, contract, and consulting engagements.

Get in touchGitHub