Germany-Based English & German AI Generalist Trainer 2026 May

Rexzone is hiring Germany-based, bilingual (German/English) AI Generalist Trainers to support RLHF, large language model evaluation, and training data quality initiatives by evaluating, ranking, and QA-checking model outputs to drive model performance improvement.

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About the Role

As a Germany-based English & German AI Generalist Trainer at Rexzone, you will evaluate and improve AI systems by reviewing model-generated outputs in real-world scenarios. Your work supports RLHF, large language model evaluation, and consistent training data quality through careful labeling, prompt evaluation, and annotation guidelines compliance. You will rank responses, write clear rationales, perform QA evaluation, and validate edge cases to help drive measurable model performance improvement.

Key Responsibilities

Evaluate and rank model-generated responses against defined rubrics and project goals; perform QA evaluation by validating labels, rationales, and final outputs for accuracy and consistency; write concise reasoning and justifications in German and English to support RLHF datasets; apply annotation guidelines compliance and flag ambiguity or guideline gaps for resolution; execute prompt evaluation and large language model evaluation across multiple task types; conduct validation checks for content safety labeling and policy adherence; identify recurring failure modes and suggest improvements that increase training data quality and model performance improvement.

Basic Qualifications

Must be based in Germany and authorized to work as a remote contractor/employee as applicable; fluent in German and English (reading and writing) with strong grammar and style; excellent analytical skills with the ability to compare outputs, detect subtle errors, and follow multi-step rubrics; strong attention to detail and comfort with repetitive, high-accuracy evaluation work; ability to document reasoning clearly and consistently; reliable internet connection and ability to meet quality and productivity targets.

Preferred Qualifications

Prior experience with data labeling, QA evaluation, or annotation projects; familiarity with LLMs, RLHF concepts, and large language model evaluation workflows; experience interpreting annotation guidelines and improving annotation guidelines compliance; background in linguistics, translation, writing, journalism, customer support, or technical documentation; self-driven, organized, and comfortable working independently in a remote setting.

How to Apply

Apply to Rexzone with a current CV/resume and a brief note confirming Germany location and German/English fluency. Qualified candidates may be asked to complete an online assessment focused on evaluation, ranking, reasoning, and training data quality.

Frequently Asked Questions

  • Q: Is this role remote?

    Yes. This is a remote, full-time role, and you must be based in Germany.

  • Q: What tasks will I do?

    You will evaluate and rank model outputs, perform QA evaluation and validation, write rationales/reasoning, follow annotation guidelines compliance, and support training data quality and model performance improvement in RLHF workflows.

  • Q: Do I need AI experience?

    AI experience is helpful but not required. Strong analytical skills, attention to detail, and the ability to follow rubrics and write clear rationales are essential; training is provided for project-specific guidelines.

  • Q: What languages are required?

    Fluency in both German and English is required, including reading and writing for large language model evaluation tasks.

  • Q: What domains are covered?

    Tasks can include general knowledge, writing quality, instruction-following, reasoning, content safety labeling, and prompt evaluation, depending on the evaluation project.

230+Domains Covered
120K+PhD, Specialist, Experts Onboarded
50+Countries Represented

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