We’re looking for experienced developers who have shipped MCP servers or tooling around Anthropic Claude 3.5 Sonnet, ideally using Node.js/TypeScript. Must-have skills / experience: - Live code of a tool server or MCP server (Node/TS preferred). - JSON Schema validation (AJV), OAuth2 client credentials with token caching, idempotency enforcement (header/keys and replay windows). - Webhook signature verification, rate limiting, structured logging with PII redaction. Engagement model: - Week 0 paid test (8 hours): Implement accounts.getBalance + payouts.simulate with AJV, OAuth2 cache, idempotency, and 6–8 tests - Weeks 1–4: MVP development (read + simulate) - Weeks 5–8: Controlled writes, hardening, weekly security reviews Optional / nice-to-have: - Experience under titles like “AI Automation,” “LLM Integration,” or “AI & Agentic Systems Architect” - Familiarity with structured logging frameworks and API policy controls Please share your portfolio, live code links, and relevant experience when applying.