Open to opportunities

Oier Hernández

@oierhernndez

Message

AI trainer and translator using Python for high-quality LLM evaluations.

Spain

Message

What I'm looking for

I’m looking for a role where I can improve LLM outputs through prompt optimization and rigorous evaluation, while using my translation and teaching background to localize content, protect quality, and apply ethics-aware testing.

I’m an AI Trainer and translator who turns language work into measurable model quality. At EARTH CARE S.L (2018-2020), I handled translation of scientific texts and copy writing, and I worked on data annotation with prompt creation/optimization and LLM output evaluation.

From 2020-2021, I continued translation for Spanish-speaking audiences and added voiceover and content production support at NONTON TV INDONESIA. I’m also a freelance translator, localizer, and proofreader since 2021, bringing a strong quality mindset and careful guideline understanding to every deliverable.

My teaching background shapes how I test and communicate AI outputs: I was a Secondary school teacher of History of Philosophy (2021-2024) and I’ve worked on pedagogy-focused evaluation thinking. In parallel, I’ve built Generative AI projects that expose LLM weaknesses (CrowdGen “Fireweed” and “STEM Table Understanding”) and I’ve handled live statistics collection for professional basketball games (ACB League, EuroLeague, Women’s League).

Experience

Work history, roles, and key accomplishments

Current

Freelance Translator & Localizer

Current

Freelance

Jan 2021 - Present (5 years 2 months)

Provided Spanish/Basque translation, localization, and proofreading for Spanish-speaking audiences, including text adaptation and quality checks. Ensured consistency and style alignment across translated materials.

Translation Localization Proofreading Spanish Text Adaptation Copy Editing Multilingual Communication

Basketball Scout & Stats Collector

IMG Arena

Jan 2023 - Jan 2025 (2 years)

Collected live statistics for professional basketball games across the ACB League, EuroLeague, and Women’s League. Supported scouting-related data collection with accuracy-focused quality control during live events.

ACB League EuroLeague Data Quality

History of Philosophy Teacher

Egibide B.H.I

Jan 2021 - Jan 2024 (3 years)

Taught secondary school History of Philosophy, covering concepts such as guideline understanding and formal logic. Applied pedagogy to support student learning and structured lesson delivery.

Secondary Education Philosophy Teaching Critical Thinking

AI Trainer & LLM Evaluator

Nonton TV Indonesia

Jan 2020 - Jan 2021 (1 year)

Evaluated LLM outputs across relevance, consistency, style, bias, hallucinations, noise, and ethics, and optimized prompt quality for localization tasks. Also supported translation work and delivered voiceover for content.

LLM Evaluation Prompt Engineering Machine Translation Localization Ethics & Compliance Quality Assurance

Translation & AI Trainer

Bio Earth Care S.L

Jan 2018 - Jan 2020 (2 years)

Translated scientific texts and developed marketing messages for packaging and labels while creating and optimizing prompts for LLM content. Performed LLM-related work including output evaluation and data annotation to improve quality.

Translation Copywriting Python Data Annotation Prompt Engineering LLM Output Evaluation Content Localization Text Adaptation Quality Assurance

Education

Degrees, certifications, and relevant coursework

UNED (Universidad Nacional de Educación a Distancia)

Master’s Degree, Teacher Training

2018 - 2019

Earned a Master’s Degree in Teacher Training at UNED from 2018 to 2019.

UNED (Universidad Nacional de Educación a Distancia)

Bachelor of Arts, Philosophy

2014 - 2018

Activities and societies: Authored articles on political philosophy (plenitudo potestatis), philosophy of mind (psychedelics), and aesthetics (Goya’s depiction of the Peninsular War).

Completed a Philosophy BA at UNED from 2014 to 2018, authoring articles on political philosophy, philosophy of mind, and aesthetics.