Customer Success specialist with 4+ years of experience in retention, account growth and consultative selling. Next to that I build and run AI tools in production: four live services that AI agents discover and pay for per call, with monitoring, tests and signed, auditable results.
Looking for: a customer-facing role at a company that builds AI agents or voice AI (solutions, customer success or partnerships), in Amsterdam or remote.
💬 Quickest way to get to know me: ask my Digital Twin, an AI version of my CV that answers in English or Dutch (by typing or by voice) and only from what I wrote myself.
📄 CV · 🌐 fizzl.eu · 💼 LinkedIn
Public demos built with Claude, each with a fictional company or only public data:
- Digital Twin: ask about my work; it answers only from my CV and says which part it used. Try it →
- ReplyDesk: turns a customer message into a draft reply that follows the company's policies; a person reviews and sends it. Live demo →
- Process Agent: AI analyses a customer case, and fixed rules decide what runs, what needs approval and what stays blocked until a person says yes. Live demo →
Live APIs that AI agents pay for per call in USDC over the x402 protocol, on Base and Solana. No accounts, no API keys. Each has an MCP server and is listed in the Coinbase CDP Bazaar.
| Project | What it does | Price |
|---|---|---|
| 🛡️ presign-guard | A green / orange / red verdict before an agent or wallet signs a transaction, approval or signature, with reason codes and a signed receipt. Also token verdicts and wallet approval audits. | from $0.01 |
| 🩺 x402 Doctor | Checks a paid API the way a paying agent would, with a fix for every problem. A $0.001 preflight tells an agent go / caution / no_go before it pays. | free on the web · from $0.001 |
| 📄 PlainText | presign-guard's verdict on wallet approvals, explained in plain language for people. 3 free checks a day. | free · $0.03–$0.04 |
| ☁️ Ichimoku Signal | Ichimoku Cloud signals, price levels and a ranked scan of 148 coins, plus a public paper test of a trend-following rule. | from $0.02 |
For agent developers: x402-safe-fetch (checks an endpoint before paying, never above your budget) and presign-guard-wallet (pre-sign checks for wallets) on npm, and plugin-fizzl for ElizaOS agents.
Source: presign-guard · x402-doctor · PlainText · x402-examples
Customer success & sales: retention, needs analysis, consultative selling, upsell / cross-sell, Salesforce
AI & agents: Claude API and Claude Code, prompt design, evaluation, MCP servers, guardrails where the model explains but never decides
Building: Node.js Express OpenAPI GitHub Actions Render Playwright HTML/CSS/JS · basic Python
Security & reliability: secrets management, signed receipts, health checks, monitoring, debugging from logs
Web3 & payments: x402 USDC Base Solana ERC-20 approvals EIP-712 Permit2
Languages: Dutch (native) · English (C1) · German (B2) · French (B1)
Build AI solutions that are useful, understandable and actually solve problems.