Oier H.

Key Skills

Software

Don't disclose

Appen

Top Subject Matter

LLM output evaluation and text quality control

Translation/localization and prompt-assisted text generation

Question answering dataset creation and LLM evaluation (Generative AI projects)

Top Data Types

Text

Document

Audio

Top Task Types

Question Answering

Fine-tuning

Data Collection

Freelancer Overview

Data annotation and LLM evaluation (BIO EARTH CARE S.L). Brings 9+ years of professional experience across complex professional workflows, research, and quality-focused execution. Core strengths include Don't disclose and Other. Education includes Bachelor of Arts, UNED (2018) and Master of Education, UNED (2019). AI-training focus includes data types such as Text and labeling workflows including Evaluation, Rating, and Translation.

Labeling Experience

Freelance translator/localizer/proofreader (ongoing)

OtherText

Performed translation, localization, and proofreading for multilingual text. Ensured linguistic quality for Spanish and Basque content intended for target audiences. Applied language expertise to maintain clarity and consistency across versions. • Translate and localize text for Spanish-speaking contexts • Proofread and ensure language quality • Adapt wording for intended audience • Maintain consistency across localized outputs

2021 - Present

Generative AI dataset/project work: CrowdGen (Fireweed, STEM Table Understanding)

OtherTextQuestion Answering

Designed AI training and evaluation tasks by creating challenging questions and reference answers that require deep comprehension. Built STEM table understanding materials by generating question-answer pairs from source tables intended to reveal LLM weaknesses. Performed empirical testing to identify dead angles and failure patterns. • Created QA pairs from tables • Crafted questions to trigger model failures • Provided clear, concise reference answers • Conducted empirical evaluation to uncover blind spots

2023 - 2025

AI trainer/prompt and localization work alongside translation duties (BIO EARTH CARE S.L)

OtherText

Created and localized text content including scientific translations and marketing/packaging copy. Developed prompts for generating or improving textual outputs and iterated on prompt performance based on quality needs. Helped ensure localization accuracy for Spanish-speaking audiences and consistent delivery of translated materials. • Translation of scientific texts • Development of marketing messages and label/packaging content • Prompt creation/optimization for text generation • Localization accuracy checks

2020 - 2021

Data annotation and LLM evaluation (BIO EARTH CARE S.L)

Don't discloseText

Performed data annotation and evaluation of AI-generated outputs for quality and reliability. Assessed outputs using criteria such as relevance, consistency, style, biases, hallucinations, and noise. Supported prompt creation/optimization to improve downstream responses. • Evaluated LLM responses against quality rubrics • Checked for hallucinations and bias • Assessed consistency and style compliance • Used evaluation feedback to refine prompts

2018 - 2020

Education

Work History