LLM Applications Engineer (Remote, Cartagena)

Blacksmith Agency; Cartagena de Indias; Remote; COP 258,942,000 - 388,412,000; Full time

Job summary

Blacksmith Agency LLC is seeking an hands-on LLM Applications Engineer to own and ship our internal automation roadmap, focusing on production-grade agent systems used by the team. This builder role emphasizes practical implementations over research and requires you to work on remote teams across regions.

You will integrate tools and services (WordPress, Figma, Google Workspace, Slack) and ensure reliable deployment with evals, guardrails, and real users. Strong English required.

Qualifications

• 2+ years building production software in Python or TypeScript / Node.js.
• At least one LLM or agent system built and run in production with real users.
• Hands-on tool use, evals and failure handling: validating model output, retries, human approval.
• REST APIs, webhooks and cloud deployment.
• Strong spoken English for live technical discussions with a US team.

Responsibilities

• Own and ship the internal automation roadmap for production LLM and agent systems.
• Build agents and workflows using tool calls and APIs.
• Create integrations with WordPress, Figma, Google Workspace and Slack; connect MCP servers.
• Develop internal tools that cut hours across delivery, sales ops and project management.

Skills

Python

TypeScript/Node.js

LLM systems

REST APIs

Cloud deployment

English (spoken)

Tools

Anthropic API

OpenAI API

Job description

About The Role

Blacksmith Agency is building AI into every part of how we work. As LLM Applications Engineer at Blacksmith, you own and ship our internal automation roadmap: production LLM and agent systems that real people on our team use every day. This is a builder role, not research. You will not train models.

We hire engineers who have already shipped an LLM system to production and can walk us through it in detail: what it did, how it was built, what broke and what they changed. This is a full-time seat and it has to be your only job.

Blacksmith Agency

• Engineering
• Full time, your only job
• Remote (Latin America and South Africa)

What You Will Build

• Agents and workflows with tool use and function calling on Anthropic and OpenAI, with a framework or plain APIs.
• Evals that prove a change made things better, and guardrails that stop a model taking a wrong or unsafe action.
• Integrations connecting WordPress, Figma, Google Workspace, Slack and our internal systems, including MCP servers.
• Internal tools that take measurable hours off delivery, sales operations and project management.

What You Bring

• 2+ years building production software in Python or TypeScript / Node.js.
• At least one LLM or agent system you built yourself that ran in production with real users.
• Hands-on tool use, evals and failure handling: validating model output, retries, human approval.
• REST APIs, webhooks and cloud deployment.
• Strong spoken English. You will talk through technical decisions on live calls with a US team.

Not a fit if

• You freelance or contract for other clients and would keep them alongside this job.
• Your LLM work is demos, tutorials or chat prompting, or your focus is model training and research.