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Vojtech User

@vojtechuser

Message

AI Data Specialist and RLHF analyst focused on model safety, evaluation, and gold‑standard dataset creation.

Czechia

Message

What I'm looking for

I seek roles focusing on RLHF, model safety, and dataset creation where I can drive high-quality evaluation, collaborate asynchronously, and improve model robustness.

I am an AI Data Specialist and RLHF Analyst with hands‑on experience evaluating generative models for reasoning, factual accuracy, and safety. I have conducted red‑team testing, defined gold‑standard responses, and analyzed failure patterns to improve model behavior and retraining pipelines.

With a background in Industrial Engineering and experience contributing to multiple annotation platforms, I maintain high quality standards under tight deadlines and collaborate asynchronously across teams to optimize data workflows and improve model robustness.

Experience

Work history, roles, and key accomplishments

Current

Agent Evaluation Analyst

Current

Toloka

Jan 2024 - Present (2 years 1 month)

Conducted red team testing and adversarial prompt design to expose safety vulnerabilities in conversational agents; evaluated outputs for reasoning, factual accuracy, and instruction following, defining gold-standard responses used to retrain models.

Red Team Prompt Engineering Model Evaluation Data Annotation Fact Checking Benchmarking

Current

AI Data Contributor

Current

Appen

Jan 2024 - Present (2 years 1 month)

Rated AI responses with multi-dimensional rubrics (helpfulness, honesty, harmlessness), identified and flagged hallucinations and bias, and maintained quality scores above 95% in remote asynchronous evaluation workflows.

Data Annotation Quality Assurance JSON Remote Collaboration Hallucination Detection

Content Operations Analyst

TPF Groups.r.o.

Jan 2022 - Jan 2024 (2 years)

Managed product databases and internal CMS, ensured data consistency, and optimized content workflows using SEO tools and spreadsheet automation to increase team throughput and resolve discrepancies in real time.

SQL Excel CMS SEO Data Quality Cross Functional Collaboration