About Me

Franz Geffke at the controls of a light aircraft — Off the clock.

My name is Franz Geffke - I was born and raised in East Germany but today my home is anywhere between Europe, the Middle-East and Southeast-Asia. New experiences and culture draw me to travel to, and live in different countries all around the world - With stronger foreign ties come a different, new perspective on all aspects of life and business which I continue to embrace.

Apart from my travels, I’m a privacy advocate and supporter of technologies and ideas that help promote personal freedom, decentralize certain aspects of power, and are easily accessible to everyone - now or in the near future.

Whenever I’m not working, I like to disconnect and return to a different era - with crackling vinyls, glowing amplifiers and tennis.

Here’s what I’m reading: Bookshelf

Work

Senior Identity Engineer at TWIN (IOTA Foundation). 14 years building production systems across identity, crypto, IoT, and real estate — sometimes as the founder.

My current focus:

Digital Identity: OID4VP, SD-JWT VC, W3C VCs, KERI/vLEI, OIDC/CIBA, OAuth 2.0
Backend Systems: TypeScript (Fastify, NestJS), Rust (Actix Web)
Blockchain: Smart contracts (Move, Solidity), NFT marketplaces with KYC, crypto exchanges
IoT: Patient monitoring, BLE/WebRTC, real-time gateways

I focus on solutions that solve concrete problems and create lasting value — using technology as a tool, not an end in itself.

Some of that experience is available directly. I take a few outside engagements: identity and systems work, building AI into regulated products, or reviewing AI features other teams already shipped. See what I take on.

Check out my resume for more details on my work experience and skills.