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Project Lion - Senior Prompt Engineer - Spain (Remote, Part-Time)

WelocalizeSpainData Validation
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Salary
Not listed
Job type
Freelance
Work mode
Remote
Posted
16 Mar 2026
Status
Open · checked 9d ago

About this role

Enterprise AI Training Data & Human seeks a freelance Senior Prompt Engineer in Spain for a remote, part-time position. This specialized role suits an experienced professional skilled in prompt engineering and large language models looking to work on innovative AI migration workflows.

Role Overview

The Senior Prompt Engineer manages the complete technical migration workflow required to transition existing templates to large language model autoraters. Operating within the Data Validation department, this freelance position focuses on optimizing artificial intelligence systems remotely from anywhere in Spain.

Key Responsibilities

Oversee the end-to-end technical migration process for shifting templates to LLM autoraters.
Utilize proprietary internal company tools to execute advanced prompt engineering strategies.
Maximize overall model performance and output accuracy through iterative prompt refinement.

Skills and Tools

LLM
Prompt Engineering
Internal Client Tools and Migration Software

About the Company

Enterprise AI Training Data & Human operates in the artificial intelligence sector, focusing on data validation, training data, and human-in-the-loop technological advancements.

How to Apply

Interested candidates should visit the official welodata.ai careers page to submit an application for this remote freelance opportunity.

Skills and tech stack

Questions candidates ask

What is the job title for this position?

The job title is Senior Prompt Engineer for Project Lion.

Where is the position located?

The role is located in Spain and can be performed remotely on a part-time basis.

What employment type is this role?

This position is freelance and part-time.

What are the primary responsibilities?

The engineer is responsible for the end-to-end technical migration workflow to transition templates to LLM autoraters and using internal tools to maximize model performance.

How can I apply for this job?

Candidates should apply directly on the official company careers page at welodata.ai.

Ready to apply?

The application is on the official Welocalize careers page.

Apply on company site