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LLM Application Engineer

bjakcareerSeoul, KoreaActAI Engineering
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Salary
Not listed
Job type
Full-time
Work mode
Remote
Experience
Mid
Posted
28 Sept 2026
Status
Open · checked 7d ago

About this role

Based in Seoul, Korea, the LLM Application Engineer role at bjakcareer centers on constructing proactive AI-native applications that minimize the need for complex prompting. This position suits software engineers with a background in generative artificial intelligence who want to develop reliable, long-running agent workflows.

Role Overview

This position involves building the core intelligence layer for artificial intelligence applications. The professional in this role will design agent workflows, enhance model reliability, and handle entire development cycles from conception to production.

Key Responsibilities

Construct and deliver applications powered by large language models and autonomous agent workflows.
Create orchestration pipelines to convert probabilistic model outputs into safe, predictable actions.
Connect models with search tools, databases, application programming interfaces, and internal services.
Implement structured outputs, prompt engineering, and tool-calling methods.
Create evaluation frameworks and datasets to monitor reliability and regressions.
Debug systems across backend services, orchestration layers, and model behaviors.
Refine applications to improve performance while balancing latency and financial costs.

Requirements

Solid software engineering background combined with practical experience creating artificial intelligence applications.
Hands-on background working with generative models, large language models, or agent systems.
Proficiency in designing workflows, prompt strategies, and evaluation methods.
Capability to write clean and production-ready code.
Familiarity navigating multiple abstraction levels ranging from the model to the end product.

Skills and Tools

Python
OpenAI-compatible application programming interfaces and open-weight models
Agent frameworks and orchestration systems
Vector databases and retrieval systems
Backend services and distributed systems
PyTorch and JAX

About the Company

bjakcareer is recruiting for ActAI, an organization focused on transforming basic daily tools into proactive, AI-native applications. The company mission centers on organizing daily workflows, conversations, and tasks with minimal user prompting while minimizing model hallucinations.

How to Apply

Interested candidates should visit the official company careers page to submit an application for this position.

Skills and tech stack

Questions candidates ask

Where is the job located?

The position is based in Seoul, Korea.

What technical stack is used for this role?

The tech stack includes Python, OpenAI-compatible application programming interfaces, open-weight models, agent frameworks, vector databases, backend services, and PyTorch or JAX.

What are the primary responsibilities of an LLM Application Engineer?

Responsibilities include building LLM-powered applications, designing agent workflows, creating orchestration pipelines, integrating models with external tools, building evaluation frameworks, and optimizing systems for quality and latency.

What is the mission of ActAI?

The mission is to build proactive, AI-native applications that bring intelligence to everyday tasks and workflows with minimal to no prompting.

How should applicants apply for this position?

Candidates must apply directly on the official company careers page.

Ready to apply?

The application is on the official bjakcareer careers page.

Apply on company site