Question 1

What does Yonatan Gross do?

Accepted Answer

Yonatan is an AI Platform Engineer & Backend Developer who designs and operates production AI systems solo - RAG pipelines, multi-agent architectures, MCP servers, and the infrastructure that runs them. He built a WhatsApp AI platform and created OrchestKit, an open-source Claude Code agent framework (109 skills, 36 agents, 171 hooks).

Question 2

How can I reach Yonatan?

Accepted Answer

Book a free 15-minute intro call at https://cal.com/yonyon/15min, or email hi@yonyon.ai.

Question 3

Can an AI agent use the chat API on this site?

Accepted Answer

Yes. Full developer & API docs are at https://yonyon.ai/developers. POST to https://yonyon.ai/api/chat with JSON body {"messages":[{"role":"user","content":"..."}]} (up to 20 messages, each up to 2000 chars). Public, no auth, rate-limited to 10 requests per IP per minute, backed by the claude-haiku-4-5 model, streaming a text/plain response. See also https://yonyon.ai/llms.txt and https://yonyon.ai/.well-known/agent-skills/index.json.

Question 4

How much does it cost to work with Yonatan, and how do I get a quote?

Accepted Answer

Engagements are scoped per project, so there is no fixed price list - quotes depend on what you are building. The fastest path to a quote is to book a free 15-minute intro call at https://cal.com/yonyon/15min, describe the work, and get a scoped proposal. You can also email hi@yonyon.ai.

Question 5

Why choose Yonatan over an agency or a freelance marketplace?

Accepted Answer

You work directly with the engineer who designs, builds, and operates the system - no account managers, no hand-offs, no junior bench. Yonatan ships production AI end-to-end (RAG, multi-agent, MCP servers, and the infrastructure they run on) as a single accountable point of contact, and has done so in production (a WhatsApp AI platform) and in the open (OrchestKit). For teams that want senior, hands-on ownership rather than a staffing layer, that directness is the difference.

Capability
Backend & Data





RAG & Knowledge


AI & LLM





Multi-Agent



Infra & DevOps


Design & Frontend


Product & Ops

Capability
Backend & Data





RAG & Knowledge


AI & LLM





Multi-Agent



Infra & DevOps


Design & Frontend


Product & Ops

Selected Work

Where each capability shipped

Backend & Data

RAG & Knowledge

AI & LLM

Multi-Agent

Infra & DevOps

Design & Frontend

Product & Ops

Working artifacts, published live

Why hire one engineer instead of an agency?

Want this outcome for your product?

Backend & Data

RAG & Knowledge

AI & LLM

Multi-Agent

Infra & DevOps

Design & Frontend

Product & Ops

Selected Work

Where each capability shipped

Backend & Data

High-Scale Financial Backend1 engagement

APIs and integrations6 engagements

Backend and data platform3 engagements

Caching and job queues3 engagements

Scheduled background automations3 engagements

RAG & Knowledge

AI search over your documents2 engagements

Knowledge bases for AI1 engagement

AI & LLM

AI quality testing (evals)2 engagements

AI video and visual content1 engagement

Custom MCP Servers3 engagements

Voice notes to text1 engagement

WhatsApp AI assistants1 engagement

Multi-Agent

Multi-step AI agents4 engagements

Agent Frameworks (OrchestKit)1 engagement

Custom Claude agents3 engagements

Infra & DevOps

Automated testing and release pipeline9 engagements

Infrastructure as code1 engagement

Design & Frontend

Web apps and design systems5 engagements

Websites you can edit yourself2 engagements

Product & Ops

Market and data monitoring3 engagements

Payments and invoicing integration1 engagement

Working artifacts, published live

Why hire one engineer instead of an agency?

Want this outcome for your product?

Backend & Data

High-Scale Financial Backend1 engagement

APIs and integrations6 engagements

Backend and data platform3 engagements

Caching and job queues3 engagements

Scheduled background automations3 engagements

RAG & Knowledge

AI search over your documents2 engagements

Knowledge bases for AI1 engagement

AI & LLM

AI quality testing (evals)2 engagements

AI video and visual content1 engagement

Custom MCP Servers3 engagements

Voice notes to text1 engagement

WhatsApp AI assistants1 engagement

Multi-Agent

Multi-step AI agents4 engagements

Agent Frameworks (OrchestKit)1 engagement

Custom Claude agents3 engagements

Infra & DevOps

Automated testing and release pipeline9 engagements

Infrastructure as code1 engagement

Design & Frontend

Web apps and design systems5 engagements

Websites you can edit yourself2 engagements

Product & Ops

Market and data monitoring3 engagements

Payments and invoicing integration1 engagement