YEJUA.
Engineering the Future

Engineering partner for
AI and software that ships

Yejua is an AI agent and software group led by a full-stack engineer and CTO with more than twenty years in the field.

Start a project See what we build
What we do

Two branches from one foundation

AI agents that carry out the work, and commerce automation that takes load off sellers. Both grow on the same technology.

AI Agents

Sales, research, hiring and careers — executed rather than assisted. We build the LLM infrastructure ourselves.

  • Sales Agentsales-agent.kr
  • Data Agentdata-agent.kr
  • Career Agentcareer-agent.kr
  • Hiring Agenthiring-agent.kr
  • AI GatewayLLM infrastructure

Commerce Automation

Sourcing, listing, order sync. We automated the exact stretch we struggled through as sellers.

  • World Market Agentshopee.sales-agent.kr
  • AliExpress Auto-listingali.sales-agent.kr
  • Detail Page Studiodetail.sales-agent.kr
  • StoreAstorea.kr
Architecture & Scalability

The structure running today is the one that scales

Design, deployment, operations and incident response run through one team. Decisions land quickly, and what gets built actually runs.

A architecture built to grow

Starting from a single-server environment, independent AI agents and complex automation pipelines — 130+ n8n workflows — were integrated into one coherent system, designed to expand into a multi-server cluster as traffic demands.

Unified LLM control · AI Gateway

We built our own high-performance gateway that governs multiple providers behind a single endpoint, handling call logging, usage ceilings and settlement in one place.

OpenAIAnthropicGeminiBedrock

Runtime

  • AWS EC2 on Amazon Linux
  • nginx TLS termination with auto-renewal
  • PM2, systemd services and timers
  • Docker container operations

AI Layer

  • All LLM traffic through our own gateway
  • OpenAI · Anthropic · Gemini · Bedrock
  • Call logging, usage ceilings, auto settlement
  • APM-based performance monitoring

Data

  • MariaDB with per-product instance isolation
  • Supabase Postgres, Auth and Edge Functions
  • Multi-tenant schema design

Automation

  • Self-hosted n8n workflows
  • Payments and settlement automation
  • Self-operated mail infrastructure (SPF · DKIM)
  • Daily batches and alert dispatch

If you know what needs building, we will build exactly that.

AI workflow automation, web and app development, commerce automation. You do not need a specification — we can start from deciding what to build.

Start a project contact@sales-agent.kr