Available for workSurabaya, ID

AI systems.Real domains.

Multi-tenant chat Workers and local-first apps. Chat API is live; Yume is in development.

Full-stack product engineer

View work justeita@proton.me

api.justeita.com

Featured

Chat API

Multi-tenant streaming chat Worker for live origins.

Case study Live

AI systems · research · live demos

Selected work

AI systems

All work

AI · yume

Yume

Personal AI still in development: layered memory, adaptive thinking, psyche stack.

3-tier memory · adaptive think · case study while WIP

TypeScript
Bun
LangGraph
Hono
WebSocket

Case studyIn development

About

Design to deploy, alone.

Streaming tenant chat, layered memory, adaptive thinking. Same monorepo patterns; different product constraints.

Marson · Surabaya, ID

Full-stack product engineer · Available for work

Read about

Live on

api.justeita.com

Focus

Multi-tenant streaming chat
Local-first client apps
Applied LLM engineering

System

api.justeita.com/health · health · …

One monorepo. Two Workers.

Portfolio root and the chat Worker share @portfolio/chatbot. Origin hits api.justeita.com; the Worker picks the tenant prompt.

Origin

Tenant

portfolio

Work refuse · portfolio prompt

Prompt snippet

Answer about live AI systems and availability. Refuse coding homework.

Open live →

Origin → tenant prompt
KV model config · secrets for keys
OpenNext sites · wrangler API

justeita.comPortfolio v3
api.justeita.comChat Worker

Contact · Available for work

Let's talk.

justeita@proton.me

Need an AI system, a streaming chat backend, or a local-first product. Email is fastest.

Response

Usually within a day. AI track. Briefs welcome.

Surabaya, ID · Full-stack product engineer

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