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Diego Sánchez Casillas

@diegosnchezcasillas

Native Spanish (MX) linguist: localization QA, legal translation EN>ES, AI evaluation. Credited on Let It Die: Inferno. Open to remote contracts.

Mexico

Message

What I'm looking for

Remote contract or long-term freelance roles centered on Spanish language quality: game localization QA, linguistic QA, LLM/AI language evaluation, or EN>ES legal translation. I prefer stable, recurring work with clear guidelines and quality criteria. Based in Mexico, flexible across time zones, open to part-time that can grow.

I'm a native Latin American Spanish linguist based in Mexico, working across game localization QA, AI language evaluation, and legal translation, with professional proficiency in European Spanish.

At Kinsha Co., Ltd. (Tokyo), I performed linguistic QA on the Japanese-to-European Spanish localization of Let It Die: Inferno and was credited in its official staff roll. I checked strings for accuracy, consistency, and cultural relevance, ran UI and layout checks, reported defects with clear reproduction steps, and regression-tested fixes.

Since 2025, I've evaluated EN–ES LLM outputs, specializing in Latin American Spanish, giving structured feedback on fluency, instruction-following, and cultural appropriateness. I also translate legal documents from English into Spanish on a project basis and hold a legal translation certificate (IFIJUM) and a Cambridge C1 Advanced in English, and I'm studying Japanese (JLPT N4).

I'm looking for remote contract roles in localization QA, linguistic evaluation, or legal and technical translation, where precision and consistent terminology matter.

Experience

Work history, roles, and key accomplishments

Current

AI / LLM Language Evaluator

Current

Freelance

Jan 2025 - Present (1 year 9 months)

Evaluated EN-ES outputs across multiple LLM projects for fluency, coherence, and cultural appropriateness. Provided structured feedback and conducted side-by-side comparative evaluations.

LLM Evaluation Spanish Grammar Cultural Adaptation Side By Side Evaluations Rubric Based Scoring

Operations Manager

Bar Los Deportados

Jan 2023 - Dec 2025 (2 years 11 months)

Managed day-to-day operations and led a team of 5+ staff in a fast-paced environment. Oversaw budgeting, payroll, and supplier negotiations.

Operations Management Team Leadership Budgeting Payroll Supplier Negotiation

Game Localization QA Tester

Kinsha Co., Ltd.

Sep 2025 - Oct 2025 (1 month)

Performed linguistic QA on in-game text localized from Japanese into European Spanish, verifying accuracy and consistency. Credited in the official staff roll of Let It Die: Inferno for Spanish LQA.

LQA Defect Reporting UI UX testing Regression Testing Jira Localization Pipeline QA