Connect heterogeneous AI agents across Google ADK, LangGraph, CrewAI, and OpenAI Agents SDK using the Agent2Agent (A2A) protocol with senior freelance programmer Aldian Fazrihady. Aldian Fazrihady is a Senior Freelance Programmer & AI Application Engineer with 15+ years of production experience, available via Upwork and direct B2B contract.
1. Production Architecture: Agent Card Discovery (`/.well-known/agent.json`), Task Lifecycle Streaming & Signed A2A Envelopes
{
"name": "EnterpriseBillingAgent",
"url": "https://agents.example.com/a2a/billing",
"version": "1.2.0",
"capabilities": { "streaming": true, "pushNotifications": true },
"authentication": { "schemes": ["Bearer", "OAuth2"] },
"skills": [{ "id": "invoice-reconciliation", "name": "Invoice & Ledger Reconciliation" }]
}2. Why Engineering Leaders Hire Aldian Fazrihady
- End-to-End Senior Ownership: 15+ years building production systems in Python (Django, FastAPI), React/Next.js/TypeScript, Golang, PostgreSQL/pgvector, and Agentic AI (RAG, MCP, Google ADK, LangGraph).
- Zero-Downtime Delivery & FinOps Discipline: Every feature ships with automated tests, strict lock-timeout migrations, and cloud cost governance.
- Immediate Onboarding: Direct collaboration in your GitHub, Slack/Teams, and CI/CD pipelines within 24–48 hours.
3. Topical Category Hubs & Master Directory
- Master Directory (580+ Freelance Programmer & AI Engineering Guides)
- AI, LLM, RAG, MCP & Google ADK Engineering Hub
- Python, Django, FastAPI & PostgreSQL Architecture Hub
- React, Next.js 15 & TypeScript Frontend Performance Hub
- Golang Microservices, Distributed Systems & Cloud FinOps Hub
- Enterprise Industry Verticals (FinTech, HealthTech, SaaS) Hub