Software engineer, Berlin
I build software, and the teams that build it.
14 years as an engineer and engineering manager. I write about backend engineering, AI agents and hiring, and help teams hire well.
Latest writing
All posts
The tale of The Machine That Couldn’t Pay — Agents and 402 (Part 1)
HTTP 402 sat unused for thirty years. Now agents need to pay, x402 and Stripe bridge crypto to fiat, and Western banking, Europe especially, isn't ready. Here's why.
Things I've built
- Billino Invoicing for freelancers and businesses in Europe and the US, with e-invoice PDFs and DATEV exports.
- Witnes Privacy first analytics and frontend performance, so you can see what each visitor experienced without cookies.
- bufferq A sidecar for your API that decides whether each caller is admitted, deferred or rejected.
About
I'm Christos, a software engineer based in Berlin. I've spent 14 years building products and leading engineering teams.